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Continuing the process of splitting up libm tests into more reasonably
sized units, this patch splits libm-test.inc into 121 separate
libm-test-<function>.inc files, one per array of test data. (There
are 126 libm *_test functions, but five of those are for functions
that are aliases for test purposes and so share arrays of test data.)
In the present patch, the 121 files get processed separately by
gen-libm-test.pl, each using only the auto-libm-test-out-<function>
file that is relevant (/dev/null for functions not using
auto-libm-test-* at all). This effectively eliminates the
serialization on running gen-libm-test.pl. However, the resulting .c
files still all get #included together, so compiling the limited
number of libm tests using libm-test.inc may still act as a
serialization point (the compilations still all have 40 MB of code to
process). libm-test.inc doesn't actually have anything in it any more
that needs gen-libm-test.pl processing, but is left as a .inc file
that gets processed to produce a .c file, rather than being renamed,
since the intent of this patch is as an intermediate step before
libm-test.inc gets removed and tests get compiled separately for each
function being tested.
Tested for x86_64.
* math/libm-test.inc: Move all tests of individual functions to
libm-test-*.inc and #include libm-test-*.c files.
(acos_test_data): Remove.
(acos_test): Likewise.
(acosh_test_data): Likewise.
(acosh_test): Likewise.
(asin_test_data): Likewise.
(asin_test): Likewise.
(asinh_test_data): Likewise.
(asinh_test): Likewise.
(atan_test_data): Likewise.
(atan_test): Likewise.
(atanh_test_data): Likewise.
(atanh_test): Likewise.
(atan2_test_data): Likewise.
(atan2_test): Likewise.
(cabs_test_data): Likewise.
(cabs_test): Likewise.
(cacos_test_data): Likewise.
(cacos_test): Likewise.
(cacosh_test_data): Likewise.
(cacosh_test): Likewise.
(canonicalize_test_data): Likewise.
(canonicalize_test): Likewise.
(carg_test_data): Likewise.
(carg_test): Likewise.
(casin_test_data): Likewise.
(casin_test): Likewise.
(casinh_test_data): Likewise.
(casinh_test): Likewise.
(catan_test_data): Likewise.
(catan_test): Likewise.
(catanh_test_data): Likewise.
(catanh_test): Likewise.
(cbrt_test_data): Likewise.
(cbrt_test): Likewise.
(ccos_test_data): Likewise.
(ccos_test): Likewise.
(ccosh_test_data): Likewise.
(ccosh_test): Likewise.
(ceil_test_data): Likewise.
(ceil_test): Likewise.
(cexp_test_data): Likewise.
(cexp_test): Likewise.
(cimag_test_data): Likewise.
(cimag_test): Likewise.
(clog_test_data): Likewise.
(clog_test): Likewise.
(clog10_test_data): Likewise.
(clog10_test): Likewise.
(conj_test_data): Likewise.
(conj_test): Likewise.
(copysign_test_data): Likewise.
(copysign_test): Likewise.
(cos_test_data): Likewise.
(cos_test): Likewise.
(cosh_test_data): Likewise.
(cosh_test): Likewise.
(cpow_test_data): Likewise.
(cpow_test): Likewise.
(cproj_test_data): Likewise.
(cproj_test): Likewise.
(creal_test_data): Likewise.
(creal_test): Likewise.
(csin_test_data): Likewise.
(csin_test): Likewise.
(csinh_test_data): Likewise.
(csinh_test): Likewise.
(csqrt_test_data): Likewise.
(csqrt_test): Likewise.
(ctan_test_data): Likewise.
(ctan_test): Likewise.
(ctanh_test_data): Likewise.
(ctanh_test): Likewise.
(erf_test_data): Likewise.
(erf_test): Likewise.
(erfc_test_data): Likewise.
(erfc_test): Likewise.
(exp_test_data): Likewise.
(exp_test): Likewise.
(exp10_test_data): Likewise.
(exp10_test): Likewise.
(pow10_test): Likewise.
(exp2_test_data): Likewise.
(exp2_test): Likewise.
(expm1_test_data): Likewise.
(expm1_test): Likewise.
(fabs_test_data): Likewise.
(fabs_test): Likewise.
(fdim_test_data): Likewise.
(fdim_test): Likewise.
(floor_test_data): Likewise.
(floor_test): Likewise.
(fma_test_data): Likewise.
(fma_test): Likewise.
(fmax_test_data): Likewise.
(fmax_test): Likewise.
(fmaxmag_test_data): Likewise.
(fmaxmag_test): Likewise.
(fmin_test_data): Likewise.
(fmin_test): Likewise.
(fminmag_test_data): Likewise.
(fminmag_test): Likewise.
(fmod_test_data): Likewise.
(fmod_test): Likewise.
(fpclassify_test_data): Likewise.
(fpclassify_test): Likewise.
(frexp_test_data): Likewise.
(frexp_test): Likewise.
(fromfp_test_data): Likewise.
(fromfp_test): Likewise.
(fromfpx_test_data): Likewise.
(fromfpx_test): Likewise.
(getpayload_test_data): Likewise.
(getpayload_test): Likewise.
(hypot_test_data): Likewise.
(hypot_test): Likewise.
(ilogb_test_data): Likewise.
(ilogb_test): Likewise.
(iscanonical_test_data): Likewise.
(iscanonical_test): Likewise.
(iseqsig_test_data): Likewise.
(iseqsig_test): Likewise.
(isfinite_test_data): Likewise.
(isfinite_test): Likewise.
(finite_test): Likewise.
(isgreater_test_data): Likewise.
(isgreater_test): Likewise.
(isgreaterequal_test_data): Likewise.
(isgreaterequal_test): Likewise.
(isinf_test_data): Likewise.
(isinf_test): Likewise.
(isless_test_data): Likewise.
(isless_test): Likewise.
(islessequal_test_data): Likewise.
(islessequal_test): Likewise.
(islessgreater_test_data): Likewise.
(islessgreater_test): Likewise.
(isnan_test_data): Likewise.
(isnan_test): Likewise.
(isnormal_test_data): Likewise.
(isnormal_test): Likewise.
(issignaling_test_data): Likewise.
(issignaling_test): Likewise.
(issubnormal_test_data): Likewise.
(issubnormal_test): Likewise.
(isunordered_test_data): Likewise.
(isunordered_test): Likewise.
(iszero_test_data): Likewise.
(iszero_test): Likewise.
(j0_test_data): Likewise.
(j0_test): Likewise.
(j1_test_data): Likewise.
(j1_test): Likewise.
(jn_test_data): Likewise.
(jn_test): Likewise.
(lgamma_test_data): Likewise.
(lgamma_test): Likewise.
(gamma_test): Likewise.
(llogb_test_data): Likewise.
(llogb_test): Likewise.
(lrint_test_data): Likewise.
(lrint_test): Likewise.
(llrint_test_data): Likewise.
(llrint_test): Likewise.
(log_test_data): Likewise.
(log_test): Likewise.
(log10_test_data): Likewise.
(log10_test): Likewise.
(log1p_test_data): Likewise.
(log1p_test): Likewise.
(log2_test_data): Likewise.
(log2_test): Likewise.
(logb_test_data): Likewise.
(logb_test): Likewise.
(lround_test_data): Likewise.
(lround_test): Likewise.
(llround_test_data): Likewise.
(llround_test): Likewise.
(modf_test_data): Likewise.
(modf_test): Likewise.
(nearbyint_test_data): Likewise.
(nearbyint_test): Likewise.
(nextafter_test_data): Likewise.
(nextafter_test): Likewise.
(nextup_test_data): Likewise.
(nextup_test): Likewise.
(nextdown_test_data): Likewise.
(nextdown_test): Likewise.
(nexttoward_test_data): Likewise.
(nexttoward_test): Likewise.
(pow_test_data): Likewise.
(pow_test): Likewise.
(remainder_test_data): Likewise.
(remainder_test): Likewise.
(drem_test): Likewise.
(remquo_test_data): Likewise.
(remquo_test): Likewise.
(rint_test_data): Likewise.
(rint_test): Likewise.
(round_test_data): Likewise.
(round_test): Likewise.
(roundeven_test_data): Likewise.
(roundeven_test): Likewise.
(scalb_test_data): Likewise.
(scalb_test): Likewise.
(scalbn_test_data): Likewise.
(scalbn_test): Likewise.
(ldexp_test): Likewise.
(scalbln_test_data): Likewise.
(scalbln_test): Likewise.
(setpayload_test_data): Likewise.
(setpayload_test): Likewise.
(setpayloadsig_test_data): Likewise.
(setpayloadsig_test): Likewise.
(signbit_test_data): Likewise.
(signbit_test): Likewise.
(sin_test_data): Likewise.
(sin_test): Likewise.
(sincos_test_data): Likewise.
(sincos_test): Likewise.
(sinh_test_data): Likewise.
(sinh_test): Likewise.
(sqrt_test_data): Likewise.
(sqrt_test): Likewise.
(tan_test_data): Likewise.
(tan_test): Likewise.
(tanh_test_data): Likewise.
(tanh_test): Likewise.
(tgamma_test_data): Likewise.
(tgamma_test): Likewise.
(totalorder_test_data): Likewise.
(totalorder_test): Likewise.
(totalordermag_test_data): Likewise.
(totalordermag_test): Likewise.
(trunc_test_data): Likewise.
(trunc_test): Likewise.
(ufromfp_test_data): Likewise.
(ufromfp_test): Likewise.
(ufromfpx_test_data): Likewise.
(ufromfpx_test): Likewise.
(y0_test_data): Likewise.
(y0_test): Likewise.
(y1_test_data): Likewise.
(y1_test): Likewise.
(yn_test_data): Likewise.
(yn_test): Likewise.
(significand_test_data): Likewise.
(significand_test): Likewise.
* math/Makefile (auto-libm-test-out-files): Remove variable.
(libm-test-funcs-noauto): New variable.
(libm-test-funcs-all): Likewise.
(libm-test-c-auto): Likewise.
(libm-test-c-noauto): Likewise.
(libm-tests-generated): Add $(libm-test-c-auto) and
$(libm-test-c-noauto).
(generated): Do not add auto-libm-test-out.
(libm-test-c-auto-obj): New variable.
(libm-test-c-noauto-obj): Likewise.
($(objpfx)libm-test.c): Do not generate or use auto-libm-test-out.
($(libm-test-c-noauto-obj)): New static pattern rule.
($(libm-test-c-auto-obj)): Likewise.
(libm-test-incs): New variable.
($(objpfx)libm-have-vector-test.h): Depend on $(libm-test-incs)
and pass it to gen-libm-have-vector-test.sh.
* math/gen-libm-have-vector-test.sh: Expect list of .inc files to
be passed on command line.
* math/libm-test-acos.inc: New file. Content from
math/libm-test.inc.
* math/libm-test-acosh.inc: Likewise.
* math/libm-test-asin.inc: Likewise.
* math/libm-test-asinh.inc: Likewise.
* math/libm-test-atan.inc: Likewise.
* math/libm-test-atan2.inc: Likewise.
* math/libm-test-atanh.inc: Likewise.
* math/libm-test-cabs.inc: Likewise.
* math/libm-test-cacos.inc: Likewise.
* math/libm-test-cacosh.inc: Likewise.
* math/libm-test-canonicalize.inc: Likewise.
* math/libm-test-carg.inc: Likewise.
* math/libm-test-casin.inc: Likewise.
* math/libm-test-casinh.inc: Likewise.
* math/libm-test-catan.inc: Likewise.
* math/libm-test-catanh.inc: Likewise.
* math/libm-test-cbrt.inc: Likewise.
* math/libm-test-ccos.inc: Likewise.
* math/libm-test-ccosh.inc: Likewise.
* math/libm-test-ceil.inc: Likewise.
* math/libm-test-cexp.inc: Likewise.
* math/libm-test-cimag.inc: Likewise.
* math/libm-test-clog.inc: Likewise.
* math/libm-test-clog10.inc: Likewise.
* math/libm-test-conj.inc: Likewise.
* math/libm-test-copysign.inc: Likewise.
* math/libm-test-cos.inc: Likewise.
* math/libm-test-cosh.inc: Likewise.
* math/libm-test-cpow.inc: Likewise.
* math/libm-test-cproj.inc: Likewise.
* math/libm-test-creal.inc: Likewise.
* math/libm-test-csin.inc: Likewise.
* math/libm-test-csinh.inc: Likewise.
* math/libm-test-csqrt.inc: Likewise.
* math/libm-test-ctan.inc: Likewise.
* math/libm-test-ctanh.inc: Likewise.
* math/libm-test-erf.inc: Likewise.
* math/libm-test-erfc.inc: Likewise.
* math/libm-test-exp.inc: Likewise.
* math/libm-test-exp10.inc: Likewise.
* math/libm-test-exp2.inc: Likewise.
* math/libm-test-expm1.inc: Likewise.
* math/libm-test-fabs.inc: Likewise.
* math/libm-test-fdim.inc: Likewise.
* math/libm-test-floor.inc: Likewise.
* math/libm-test-fma.inc: Likewise.
* math/libm-test-fmax.inc: Likewise.
* math/libm-test-fmaxmag.inc: Likewise.
* math/libm-test-fmin.inc: Likewise.
* math/libm-test-fminmag.inc: Likewise.
* math/libm-test-fmod.inc: Likewise.
* math/libm-test-fpclassify.inc: Likewise.
* math/libm-test-frexp.inc: Likewise.
* math/libm-test-fromfp.inc: Likewise.
* math/libm-test-fromfpx.inc: Likewise.
* math/libm-test-getpayload.inc: Likewise.
* math/libm-test-hypot.inc: Likewise.
* math/libm-test-ilogb.inc: Likewise.
* math/libm-test-iscanonical.inc: Likewise.
* math/libm-test-iseqsig.inc: Likewise.
* math/libm-test-isfinite.inc: Likewise.
* math/libm-test-isgreater.inc: Likewise.
* math/libm-test-isgreaterequal.inc: Likewise.
* math/libm-test-isinf.inc: Likewise.
* math/libm-test-isless.inc: Likewise.
* math/libm-test-islessequal.inc: Likewise.
* math/libm-test-islessgreater.inc: Likewise.
* math/libm-test-isnan.inc: Likewise.
* math/libm-test-isnormal.inc: Likewise.
* math/libm-test-issignaling.inc: Likewise.
* math/libm-test-issubnormal.inc: Likewise.
* math/libm-test-isunordered.inc: Likewise.
* math/libm-test-iszero.inc: Likewise.
* math/libm-test-j0.inc: Likewise.
* math/libm-test-j1.inc: Likewise.
* math/libm-test-jn.inc: Likewise.
* math/libm-test-lgamma.inc: Likewise.
* math/libm-test-llogb.inc: Likewise.
* math/libm-test-llrint.inc: Likewise.
* math/libm-test-llround.inc: Likewise.
* math/libm-test-log.inc: Likewise.
* math/libm-test-log10.inc: Likewise.
* math/libm-test-log1p.inc: Likewise.
* math/libm-test-log2.inc: Likewise.
* math/libm-test-logb.inc: Likewise.
* math/libm-test-lrint.inc: Likewise.
* math/libm-test-lround.inc: Likewise.
* math/libm-test-modf.inc: Likewise.
* math/libm-test-nearbyint.inc: Likewise.
* math/libm-test-nextafter.inc: Likewise.
* math/libm-test-nextdown.inc: Likewise.
* math/libm-test-nexttoward.inc: Likewise.
* math/libm-test-nextup.inc: Likewise.
* math/libm-test-pow.inc: Likewise.
* math/libm-test-remainder.inc: Likewise.
* math/libm-test-remquo.inc: Likewise.
* math/libm-test-rint.inc: Likewise.
* math/libm-test-round.inc: Likewise.
* math/libm-test-roundeven.inc: Likewise.
* math/libm-test-scalb.inc: Likewise.
* math/libm-test-scalbln.inc: Likewise.
* math/libm-test-scalbn.inc: Likewise.
* math/libm-test-setpayload.inc: Likewise.
* math/libm-test-setpayloadsig.inc: Likewise.
* math/libm-test-signbit.inc: Likewise.
* math/libm-test-significand.inc: Likewise.
* math/libm-test-sin.inc: Likewise.
* math/libm-test-sincos.inc: Likewise.
* math/libm-test-sinh.inc: Likewise.
* math/libm-test-sqrt.inc: Likewise.
* math/libm-test-tan.inc: Likewise.
* math/libm-test-tanh.inc: Likewise.
* math/libm-test-tgamma.inc: Likewise.
* math/libm-test-totalorder.inc: Likewise.
* math/libm-test-totalordermag.inc: Likewise.
* math/libm-test-trunc.inc: Likewise.
* math/libm-test-ufromfp.inc: Likewise.
* math/libm-test-ufromfpx.inc: Likewise.
* math/libm-test-y0.inc: Likewise.
* math/libm-test-y1.inc: Likewise.
* math/libm-test-yn.inc: Likewise.
* math/README.libm-test: Update.
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math/auto-libm-test-out is, at over 30 MB, by far the largest file in
the glibc source tree. This patch splits it by function, so reducing
it to auto-libm-test-out-<func> files that are all under 5 MB in size.
This is preliminary to splitting up libm-test.inc as well so that each
function's tests can also be processed separately by
gen-libm-test.pl. As a preliminary patch it doesn't actually
implement that step; rather, all the separate files get concatenated
by the Makefile to produce the monolithic auto-libm-test-out file
again as an input to gen-libm-test.pl. (The concatentation is
identical to the file in the source tree before this patch.)
Even this preliminary step, however, is of use independent of
splitting up libm-test.inc: some tests for csin and csinh have not
been moved to auto-libm-test-in because they result in
auto-libm-test-out generation taking several minutes rather than a few
seconds (all released MPC versions are very slow for certain sin /
sinh inputs; there are some old improvements in MPC mainline which
should eventually become MPC 1.1, but the complex inverse trig and
hyperbolic functions are slow even in MPC mainline and have yet to be
moved to auto-libm-test-in at all), and it seems much more reasonable
to add such inputs to auto-libm-test-in when it will only slow down
regeneration for particular functions than when it will slow down
regeneration globally.
gen-auto-libm-tests still parses the whole input file, but only
generates output for the requested function. This ensures bad syntax
in the file is always detected, and parsing the whole file is quick;
it's output generation that is comparatively slow for some functions.
Tested for x86_64.
* math/gen-auto-libm-tests.c: Update comment about use of program.
(generate_output): Add argument FUNCTION.
(main): Require extra argument. Pass function name to
generate_output.
* math/Makefile (generated): Add auto-libm-test-out.
(libm-test-funcs-auto): New variable.
(auto-libm-test-out-files): New variable.
($(objpfx)libm-test.c): Depend on $(auto-libm-test-out-files).
Concatenate those files to form $(objpfx)auto-libm-test-out and
use it as input to gen-libm-test.pl.
* math/README.libm-test: Update.
* math/auto-libm-test-out: Remove.
* math/auto-libm-test-out-acos: New generated file.
* math/auto-libm-test-out-acosh: Likewise.
* math/auto-libm-test-out-asin: Likewise.
* math/auto-libm-test-out-asinh: Likewise.
* math/auto-libm-test-out-atan: Likewise.
* math/auto-libm-test-out-atan2: Likewise.
* math/auto-libm-test-out-atanh: Likewise.
* math/auto-libm-test-out-cabs: Likewise.
* math/auto-libm-test-out-carg: Likewise.
* math/auto-libm-test-out-cbrt: Likewise.
* math/auto-libm-test-out-ccos: Likewise.
* math/auto-libm-test-out-ccosh: Likewise.
* math/auto-libm-test-out-cexp: Likewise.
* math/auto-libm-test-out-clog: Likewise.
* math/auto-libm-test-out-clog10: Likewise.
* math/auto-libm-test-out-cos: Likewise.
* math/auto-libm-test-out-cosh: Likewise.
* math/auto-libm-test-out-cpow: Likewise.
* math/auto-libm-test-out-csin: Likewise.
* math/auto-libm-test-out-csinh: Likewise.
* math/auto-libm-test-out-csqrt: Likewise.
* math/auto-libm-test-out-ctan: Likewise.
* math/auto-libm-test-out-ctanh: Likewise.
* math/auto-libm-test-out-erf: Likewise.
* math/auto-libm-test-out-erfc: Likewise.
* math/auto-libm-test-out-exp: Likewise.
* math/auto-libm-test-out-exp10: Likewise.
* math/auto-libm-test-out-exp2: Likewise.
* math/auto-libm-test-out-expm1: Likewise.
* math/auto-libm-test-out-fma: Likewise.
* math/auto-libm-test-out-hypot: Likewise.
* math/auto-libm-test-out-j0: Likewise.
* math/auto-libm-test-out-j1: Likewise.
* math/auto-libm-test-out-jn: Likewise.
* math/auto-libm-test-out-lgamma: Likewise.
* math/auto-libm-test-out-log: Likewise.
* math/auto-libm-test-out-log10: Likewise.
* math/auto-libm-test-out-log1p: Likewise.
* math/auto-libm-test-out-log2: Likewise.
* math/auto-libm-test-out-pow: Likewise.
* math/auto-libm-test-out-sin: Likewise.
* math/auto-libm-test-out-sincos: Likewise.
* math/auto-libm-test-out-sinh: Likewise.
* math/auto-libm-test-out-sqrt: Likewise.
* math/auto-libm-test-out-tan: Likewise.
* math/auto-libm-test-out-tanh: Likewise.
* math/auto-libm-test-out-tgamma: Likewise.
* math/auto-libm-test-out-y0: Likewise.
* math/auto-libm-test-out-y1: Likewise.
* math/auto-libm-test-out-yn: Likewise.
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math/Makefile uses libm-test.stmp to handle dependencies involving
multiple generated files all generated by a single sequence of
commands in a single Makefile rule.
Having separated the libm-test-ulps.h and libm-test.c generation into
separate runs of gen-libm-test.pl, there is now no need for a single
rule to generate multiple target files; each of the three target files
involved can be generated by a separate Makefile rule, meaning normal
dependencies on the individual files can be used and so libm-test.stmp
is not needed at all. This patch does just that, eliminating the
.stmp file, in further preparation for when there are many separate
libm-test-<func>.c files generated from libm-test-<func>.inc and the
dependencies are on just the relevant .c file in each case.
Tested for x86_64.
* math/Makefile (generated): Do not include libm-test.stmp.
($(addprefix $(objpfx), $(libm-tests-generated))): Do not depend
on $(objpfx)libm-test.stmp.
($(objpfx)libm-test.stmp): Remove rule.
($(objpfx)libm-test-ulps.h): New rule.
($(objpfx)libm-test.c): Likewise.
($(objpfx)libm-have-vector-test.h): Likewise.
($(addprefix $(objpfx), $(libm-tests.o)): Depend directly on
individual generated files, not libm-test.stmp.
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This patch reworks how input and output files are specified for
gen-libm-test.pl.
Previously, the script had names of various inputs and outputs
hardcoded, with a -o option to specify an output directory. This
patch replaces this with all inputs and outputs being specified
explicitly as the arguments of options passed to the script. Outputs
are only generated if the relevant option is passed, and only the
processing required for the indicated outputs is done. The Makefile
is made to pass options for generating libm-test-ulps.h in a separate
invocation of gen-libm-test.pl from that generating libm-test.c.
This is all in preparation for splitting up libm-test.inc and
auto-libm-test-out and running tests separately for each function,
when gen-libm-test.pl will be run separately for each function to
generate the .c file but only once to generate libm-test-ulps.h (and
those runs will be able to be in parallel).
Tested for x86_64. The generated libm-test.c and libm-test-ulps.h are
identical before and after the patch. Also tested the "make
regen-ulps" case.
* math/gen-libm-test.pl ($output_dir): Remove variable.
($srcdir): Likewise.
($opt_a): New variable.
($opt_c): Likewise.
($opt_C): Likewise.
($opt_H): Likewise.
(-n): Make option take argument and use it as NewUlps output.
(-a): New option. Use its argument for auto-libm-test-out input.
(-c): New option. Use its argument for libm-test.inc input.
(-C): New option. Use its argument for libm-test.c output.
(-H): New option. Use its argument for libm-test-ulps.h output.
(top level): Only process inputs needed to generate outputs
specified by command-line options. Only generate outputs
specified by command-line options.
* math/README.libm-test: Update example gen-libm-test.pl command.
* math/Makefile ($(objpfx)libm-test.stmp): Update gen-libm-test.pl
commands.
(regen-ulps): Likewise.
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libm-test.inc contains both test infrastructure and tests of
individual functions.
This patch moves the infrastructure to a separate file
libm-test-driver.c. This is in preparation for splitting the tests of
individual functions into separate source files, which will be
processed individually by gen-libm-test.pl (so e.g. libm-test-acos.inc
and auto-libm-test-out-acos will be processed by gen-libm-test.pl to
produce libm-test-acos.c, and files such as test-double-acos.c will be
generated by the Makefile to include appropriate headers,
libm-test-driver.c and libm-test-acos.c so tests of each function get
run separately).
It is no doubt possible to split things up further, so that functions
not depending on the type being tested only get compiled once and most
of those depending on the type being tested get compiled once per type
(rather than separately for variants such as inline / no-inline, and
separately for each function being tested after that split), but this
rearrangement as-is seems a useful incremental step towards splitting
these tests by function.
* math/libm-test-driver.c: New file. Based on math/libm-test.inc.
* math/libm-test.inc: Move all contents, other than tests of
individual functions, to libm-test-driver.c.
[!FE_TONEAREST] (FE_TONEAREST): Move to libm-test-driver.c.
[!FE_TOWARDZERO] (FE_TOWARDZERO): Likewise.
[!FE_UPWARD] (FE_UPWARD): Likewise.
[!FE_DOWNWARD] (FE_DOWNWARD): Likewise.
(NO_EXCEPTION): Likewise.
(INVALID_EXCEPTION): Likewise.
(DIVIDE_BY_ZERO_EXCEPTION): Likewise.
(OVERFLOW_EXCEPTION): Likewise.
(UNDERFLOW_EXCEPTION): Likewise.
(INEXACT_EXCEPTION): Likewise.
(INVALID_EXCEPTION_OK): Likewise.
(DIVIDE_BY_ZERO_EXCEPTION_OK): Likewise.
(OVERFLOW_EXCEPTION_OK): Likewise.
(UNDERFLOW_EXCEPTION_OK): Likewise.
(NO_INEXACT_EXCEPTION): Likewise.
(EXCEPTIONS_OK): Likewise.
(IGNORE_ZERO_INF_SIGN): Likewise.
(TEST_NAN_SIGN): Likewise.
(TEST_NAN_PAYLOAD): Likewise.
(NO_TEST_INLINE): Likewise.
(XFAIL_TEST): Likewise.
(ERRNO_UNCHANGED): Likewise.
(ERRNO_EDOM): Likewise.
(ERRNO_ERANGE): Likewise.
(IGNORE_RESULT): Likewise.
(NON_FINITE): Likewise.
(TEST_SNAN): Likewise.
(NO_TEST_MATHVEC): Likewise.
(TEST_NAN_PAYLOAD_CANONICALIZE): Likewise.
(__CONCATX): Likewise.
(TYPE_MIN): Likewise.
(TYPE_TRUE_MIN): Likewise.
(TYPE_MAX): Likewise.
(MIN_EXP): Likewise.
(MAX_EXP): Likewise.
(MANT_DIG): Likewise.
(FSTR_MAX): Likewise.
(ULP_IDX): Likewise.
(QTYPE_STR): Likewise.
(TEST_COND_binary32): Likewise.
(TEST_COND_binary64): Likewise.
(TEST_COND_binary128): Likewise.
(TEST_COND_ibm128): Likewise.
(TEST_COND_intel96): Likewise.
(TEST_COND_m68k96): Likewise.
(TEST_COND_ibm128_libgcc): Likewise.
(XFAIL_IBM128_LIBGCC): Likewise.
(PAYLOAD_DIG): Likewise.
(UNDERFLOW_EXCEPTION_FLOAT): Likewise.
(UNDERFLOW_EXCEPTION_OK_FLOAT): Likewise.
(UNDERFLOW_EXCEPTION_DOUBLE): Likewise.
(UNDERFLOW_EXCEPTION_OK_DOUBLE): Likewise.
(UNDERFLOW_EXCEPTION_LDOUBLE_IBM): Likewise.
(UNDERFLOW_EXCEPTION_BEFORE_ROUNDING): Likewise.
(TEST_COND_long32): Likewise.
(TEST_COND_long64): Likewise.
(TEST_COND_before_rounding): Likewise.
(TEST_COND_after_rounding): Likewise.
(lit_pi_3_m_4_d): Likewise.
(lit_pi_3_m_4_ln10_m_d): Likewise.
(lit_pi_2_ln10_m_d): Likewise.
(lit_pi_4_ln10_m_d): Likewise.
(lit_pi_ln10_d): Likewise.
(lit_pi_2_d): Likewise.
(lit_pi_4_d): Likewise.
(lit_pi): Likewise.
(lit_e): Likewise.
(ulps_file_name): Likewise.
(ulps_file): Likewise.
(output_ulps): Likewise.
(output_dir): Likewise.
(noErrors): Likewise.
(noTests): Likewise.
(noExcTests): Likewise.
(noErrnoTests): Likewise.
(verbose): Likewise.
(output_max_error): Likewise.
(output_points): Likewise.
(ignore_max_ulp): Likewise.
(plus_zero): Likewise.
(minus_zero): Likewise.
(plus_infty): Likewise.
(minus_infty): Likewise.
(qnan_value_pl): Likewise.
(qnan_value): Likewise.
(snan_value_pl): Likewise.
(snan_value): Likewise.
(max_value): Likewise.
(min_value): Likewise.
(min_subnorm_value): Likewise.
(snan_value_ld): Likewise.
(max_error): Likewise.
(real_max_error): Likewise.
(imag_max_error): Likewise.
(prev_max_error): Likewise.
(prev_real_max_error): Likewise.
(prev_imag_max_error): Likewise.
(max_valid_error): Likewise.
(TYPE_DECIMAL_DIG): Likewise.
(TYPE_HEX_DIG): Likewise.
(fmt_ftostr): Likewise.
(compare_ulp_data): Likewise.
(find_ulps): Likewise.
(init_max_error): Likewise.
(set_max_error): Likewise.
(print_float): Likewise.
(print_screen): Likewise.
(print_screen_max_error): Likewise.
(update_stats): Likewise.
(print_function_ulps): Likewise.
(print_complex_function_ulps): Likewise.
(fpstack_test): Likewise.
(print_max_error): Likewise.
(print_complex_max_error): Likewise.
(test_single_exception): Likewise.
(test_exceptions): Likewise.
(test_single_errno): Likewise.
(test_errno): Likewise.
(ULPDIFF): Likewise.
(ulp): Likewise.
(check_float_internal): Likewise.
(check_float): Likewise.
(check_complex): Likewise.
(check_int): Likewise.
(check_long): Likewise.
(check_bool): Likewise.
(check_longlong): Likewise.
(check_intmax_t): Likewise.
(check_uintmax_t): Likewise.
(enable_test): Likewise.
(struct test_f_f_data): Likewise.
(struct test_ff_f_data): Likewise.
(struct test_fj_f_data): Likewise.
(struct test_fi_f_data): Likewise.
(struct test_fl_f_data): Likewise.
(struct test_if_f_data): Likewise.
(struct test_fff_f_data): Likewise.
(struct test_fiu_M_data): Likewise.
(struct test_fiu_U_data): Likewise.
(struct test_c_f_data): Likewise.
(struct test_f_f1_data): Likewise.
(struct test_fF_f1_data): Likewise.
(struct test_ffI_f1_data): Likewise.
(struct test_c_c_data): Likewise.
(struct test_cc_c_data): Likewise.
(struct test_f_i_data): Likewise.
(struct test_ff_i_data): Likewise.
(struct test_f_l_data): Likewise.
(struct test_f_L_data): Likewise.
(struct test_fFF_11_data): Likewise.
(struct test_Ff_b1_data): Likewise.
(IF_ROUND_INIT_): Likewise.
(IF_ROUND_INIT_FE_DOWNWARD): Likewise.
(IF_ROUND_INIT_FE_TONEAREST): Likewise.
(IF_ROUND_INIT_FE_TOWARDZERO): Likewise.
(IF_ROUND_INIT_FE_UPWARD): Likewise.
(ROUND_RESTORE_): Likewise.
(ROUND_RESTORE_FE_DOWNWARD): Likewise.
(ROUND_RESTORE_FE_TONEAREST): Likewise.
(ROUND_RESTORE_FE_TOWARDZERO): Likewise.
(ROUND_RESTORE_FE_UPWARD): Likewise.
(RM_): Likewise.
(RM_FE_DOWNWARD): Likewise.
(RM_FE_TONEAREST): Likewise.
(RM_FE_TOWARDZERO): Likewise.
(RM_FE_UPWARD): Likewise.
(COMMON_TEST_SETUP): Likewise.
(EXTRA_OUTPUT_TEST_SETUP): Likewise.
(COMMON_TEST_CLEANUP): Likewise.
(EXTRA_OUTPUT_TEST_CLEANUP): Likewise.
(RUN_TEST_f_f): Likewise.
(RUN_TEST_LOOP_f_f): Likewise.
(RUN_TEST_fp_f): Likewise.
(RUN_TEST_LOOP_fp_f): Likewise.
(RUN_TEST_2_f): Likewise.
(RUN_TEST_LOOP_2_f): Likewise.
(RUN_TEST_ff_f): Likewise.
(RUN_TEST_LOOP_ff_f): Likewise.
(RUN_TEST_LOOP_fj_f): Likewise.
(RUN_TEST_fi_f): Likewise.
(RUN_TEST_LOOP_fi_f): Likewise.
(RUN_TEST_fl_f): Likewise.
(RUN_TEST_LOOP_fl_f): Likewise.
(RUN_TEST_if_f): Likewise.
(RUN_TEST_LOOP_if_f): Likewise.
(RUN_TEST_fff_f): Likewise.
(RUN_TEST_LOOP_fff_f): Likewise.
(RUN_TEST_fiu_M): Likewise.
(RUN_TEST_LOOP_fiu_M): Likewise.
(RUN_TEST_fiu_U): Likewise.
(RUN_TEST_LOOP_fiu_U): Likewise.
(RUN_TEST_c_f): Likewise.
(RUN_TEST_LOOP_c_f): Likewise.
(RUN_TEST_f_f1): Likewise.
(RUN_TEST_LOOP_f_f1): Likewise.
(RUN_TEST_fF_f1): Likewise.
(RUN_TEST_LOOP_fF_f1): Likewise.
(RUN_TEST_fI_f1): Likewise.
(RUN_TEST_LOOP_fI_f1): Likewise.
(RUN_TEST_ffI_f1_mod8): Likewise.
(RUN_TEST_LOOP_ffI_f1_mod8): Likewise.
(RUN_TEST_Ff_b1): Likewise.
(RUN_TEST_LOOP_Ff_b1): Likewise.
(RUN_TEST_Ffp_b1): Likewise.
(RUN_TEST_LOOP_Ffp_b1): Likewise.
(RUN_TEST_c_c): Likewise.
(RUN_TEST_LOOP_c_c): Likewise.
(RUN_TEST_cc_c): Likewise.
(RUN_TEST_LOOP_cc_c): Likewise.
(RUN_TEST_f_i): Likewise.
(RUN_TEST_LOOP_f_i): Likewise.
(RUN_TEST_f_i_tg): Likewise.
(RUN_TEST_LOOP_f_i_tg): Likewise.
(RUN_TEST_ff_b): Likewise.
(RUN_TEST_LOOP_ff_b): Likewise.
(RUN_TEST_ff_i_tg): Likewise.
(RUN_TEST_LOOP_ff_i_tg): Likewise.
(RUN_TEST_f_b): Likewise.
(RUN_TEST_LOOP_f_b): Likewise.
(RUN_TEST_f_b_tg): Likewise.
(RUN_TEST_LOOP_f_b_tg): Likewise.
(RUN_TEST_f_l): Likewise.
(RUN_TEST_LOOP_f_l): Likewise.
(RUN_TEST_f_L): Likewise.
(RUN_TEST_LOOP_f_L): Likewise.
(RUN_TEST_fFF_11): Likewise.
(RUN_TEST_LOOP_fFF_11): Likewise.
(VEC_SUFF): Likewise.
(STR_CONCAT): Likewise.
(STR_CON3): Likewise.
(HAVE_VECTOR): Likewise.
(START): Likewise.
(END): Likewise.
(END_COMPLEX): Likewise.
(ALL_RM_TEST): Likewise.
(matherr): Likewise.
(initialize): Likewise.
(options): Likewise.
(doc): Likewise.
(parse_opt): Likewise.
(argp): Likewise.
(check_ulp): Likewise.
(main): Likewise.
(do_test): New function. Call tests of individual functions
previously called from main.
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math/libm-test.inc has a comment listing the functions tested and not
tested. The list of functions tested duplicates what is immediately
obvious from the rest of the file and adds another place to update
when adding a function. I've put the information about functions not
tested on the wiki todo list; this patch removes that comment, in
preparation for splitting tests of each function into separate .inc
files with common code staying in a separate .c file.
Tested for x86_64.
* math/libm-test.inc: Remove comment listing functions tested and
not tested.
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In <https://sourceware.org/ml/libc-alpha/2015-12/msg00543.html>,
Florian noted highly parallel builds being slowed down by
gen-libm-test.pl running during the build, when it should only run for
testing, not for building glibc itself.
This is a consequence of libm-test.c being listed in before-compile.
That listing in before-compile arose from the error reported in
<https://sourceware.org/ml/libc-hacker/1999-10/msg00054.html> when
building dependencies: at that time, dependencies were generated
separation from compilation, so if a source file included a generated
file it wasn't enough for the dependencies for the .o file to be
correct, the generated file needed to be listed in before-compile.
Since <https://sourceware.org/ml/libc-hacker/2003-05/msg00001.html>,
dependencies are generated as a side-effect of compilation. This
means that having the right dependencies for the .o files for the
tests fully suffices to ensure that libm-test.c is generated by the
time it's needed; no entry in before-compile is needed. And we indeed
have such a dependency for all the tests using libm-test.c:
$(addprefix $(objpfx), $(libm-tests.o)): $(objpfx)libm-test.stmp
Thus, the before-compile definition is unnecessary, and this patch
removes it. (This may of course move serialization from the glibc
build to glibc testing, but I intend to split up libm-test.inc so that
tests for each (floating-point type, libm function) pair are built and
run separately, which should reduce that serialization.)
Tested for x86_64.
* math/Makefile (before-compile): Remove.
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This patch updates math/README.libm-test to have a more complete and
up-to-date list of the characters used in TEST_* macros to indicate
the types of function inputs and outputs.
* math/README.libm-test: Update list of characters for input and
output types.
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The generic implementation of fetestexceptflag does:
int
fetestexceptflag (const fexcept_t *flagp, int excepts)
{
/* Most versions of fegetexceptflag store exceptions in a form such
that this works. */
return *flagp & excepts & FE_ALL_EXCEPT;
}
In the case where FE_ALL_EXCEPT is nonzero but exceptions may not be
supported at runtime, this only works if fegetexceptflag cleared all
the bits of FE_ALL_EXCEPT in *flagp; otherwise it accesses
uninitialized data. This showed up as a failure of
math/test-fetestexceptflag for MIPS o32 soft-float. This patch makes
the fallback fegetexceptflag store 0 (fexcept_t is an integer type
everywhere) so that this works. (No bug report in Bugzilla because
this wasn't user-visible - at least, without using tools to detect
uninitialized memory use at runtime - without fetestexceptflag, which
is new in 2.25.)
Tested for MIPS o32 soft-float.
* math/fgetexcptflg.c (__fegetexceptflag): Store 0 in fexcept_t
object.
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This patch arranges for various libm-test.inc tests to be XFAILed for
ibm128-libgcc in non-default rounding modes. The tests are marked
with XFAIL_ROUNDING_IBM128_LIBGCC and gen-libm-test.pl is made to
transform that to XFAIL_IBM128_LIBGCC or 0 depending on the rounding
mode.
This should allow test-ldouble, test-ildouble and test-ldouble-finite
to pass with unmodified libgcc, given an ulps regeneration. (The case
of patched libgcc was already clean up to ulps and possibly hypot
cases very close to the overflow threshold that may need more
XFAILing; patched libgcc, which should work with
TEST_COND_ibm128_libgcc defined to 0 to disable all these XFAILs, does
need slightly different ulps from unpatched.) Note that soft-float
powerpc will still fail because of
<https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64811> resulting in
spurious "invalid" exceptions in the libgcc code (for hard float,
<https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58684> hides that bug).
Tested for powerpc.
* math/libm-test.inc (XFAIL_IBM128_LIBGCC): New macro.
(fdim_test_data): Use XFAIL_ROUNDING_IBM128_LIBGCC for some tests.
(fma_test_data): Likewise.
(hypot_test_data): Likewise.
(log1p_test_data): Likewise.
(modf_test_data): Likewise.
(pow_test_data): Likewise.
(remainder_test_data): Likewise.
(remquo_test_data): Likewise.
(scalb_test_data): Likewise.
(scalbn_test_data): Likewise.
(scalbln_test_data): Likewise.
* math/gen-libm-test.pl (parse_args): Transform
XFAIL_ROUNDING_IBM128_LIBGCC to XFAIL_IBM128_LIBGCC or 0 depending
on the rounding mode.
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This patch further improves XFAILing for ibm128-libgcc of tests in
auto-libm-test-*.
The bulk of the cases needing XFAILing are
xfail-rounding:ibm128-libgcc used for inputs where (possibly after
rounding the inputs to another floating-point type) the result
overflows (and the result in non-default rounding modes may be wildly
wrong with unpatched libgcc) or underflows near 0 (and the result in
non-default rounding modes may end up having the wrong sign). This
patch makes gen-auto-libm-tests detect such cases and apply
xfail-rounding:ibm128-libgcc automatically to them, so most of the
manual XFAILs in auto-libm-test-in are no longer needed (some are
still needed if e.g. the result is very close to overflow, resulting
in an internal overflow in libgcc in some rounding modes). A few
manual XFAILs are added for cases not covered by this
gen-auto-libm-tests change, and a few existing such XFAILs are left
in.
Tested for powerpc.
* math/gen-auto-libm-tests.c (output_for_one_input_case): Apply
xfail-rounding:ibm128-libgcc automatically to tests overflowing
and those that can underflow to zero.
* math/auto-libm-test-in: Remove most XFAILs for ibm128-libgcc and
add others.
* math/auto-libm-test-out: Regenerated.
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This patch fixes math/test-fenv.c to check EXCEPTION_TESTS and
ROUNDING_TESTS to avoid failing in cases where some exceptions or
rounding modes are defined but not supported at runtime.
Tested for mips64 soft float and for x86_64.
* math/test-fenv.c (fe_tests): Skip most tests when exceptions not
supported.
(feholdexcept_tests): Skip tests requiring exceptions or rounding
modes support if not supported.
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The fallback implementation of fesetexceptflag currently fails if any
exceptions are specified. It should always succeed, because the
exception state is always that all exceptions (if any are defined in
<fenv.h> but not supported in this configuration) are always clear,
just as fallback fetestexcept always succeeds and fallback fesetenv
always succeeds unless asked to set FE_NOMASK_ENV.
This patch fixes it accordingly. Together with the patch to
test-fexcept.c to allow feraiseexcept to fail in another place, this
stops that test from failing for MIPS soft-float.
Tested for mips64 soft-float.
[BZ #21028]
* math/fsetexcptflg.c (__fesetexceptflag): Always return 0.
* math/test-fexcept.c (test_set): Allow failure of feraiseexcept
if EXCEPTION_TESTS returns false.
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This patch cleans up and updates the libm-test XFAILs for the ibm128
format. More of them are changed to use a new ibm128-libgcc
conditional, to reflect that they are not in fact needed if you've
patched libgcc to fix the known issues (at substantial performance
cost). Many additional XFAILs are added for tests that fail with
unpatched libgcc (most but not all of them xfail-rounding).
Note that further such fixes will be needed for test-ldouble actually
to pass with default libgcc (in particular, XFAILs for pow tests and
for various affected tests directly embedded in libm-test.inc). With
patched libgcc, there may be a few XFAILs needed but the results are
already substantially clean apart from a few ulps differences.
Tested for powerpc.
* math/libm-test.inc (TEST_COND_ibm128_libgcc): New macro.
(init_max_error) [TEST_COND_ibm128]: Increase maximum error
allowed to 16 ulps.
* math/auto-libm-test-in: Change most XFAILs for ibm128 to use
ibm128-libgcc. XFAIL more tests for ibm128-libgcc.
* math/auto-libm-test-out: Regenerated.
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This commit moves one step towards the deprecation of wrappers that
use _LIB_VERSION / matherr / __kernel_standard functionality, by
adding the suffix '_compat' to their filenames and adjusting Makefiles
and #includes accordingly.
New template wrappers that do not use such functionality will be added
by future patches and will be first used by the float128 wrappers.
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This patch fixes math/test-fenvinline.c to stop it failing in
no-exceptions configurations (where some exception macros are defined
but may not be supported at runtime). The relevant parts of the test
are disabled in that case; some parts can still run (and the rounding
mode tests are written in a way such that they work even if the
rounding modes aren't supported).
Tested for mips64 soft-float, and for x86_64 to make sure the tests
still run when the exceptions are supported.
* math/test-fenvinline.c (do_test): Disable tests of raised
exceptions if !EXCEPTION_TESTS (FLOAT).
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The test math/test-nearbyint-except conditions some of its tests on an
EXCEPTION_TESTS call, not not all that need such a condition. This
patch fixes it to use such a conditional for all its tests and to
return 77 (UNSUPPORTED) if none of the floating-point types tested
support exceptions.
Tested for mips64 soft float (where the test previously failed and is
now UNSUPPORTED); also tested for x86_64 to make sure the test still
PASSes in exceptions-supported cases.
* math/test-nearbyint-except.c: Include <stdbool.h>.
(any_supported): New variable.
(TEST_FUNC): Return early if !EXCEPTION_TESTS (FLOAT). Otherwise
set any_supported.
(do_test): Return 77 if no floating-point type supported
exceptions.
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TS 18661-1 defines fromfp functions (fromfp, fromfpx, ufromfp,
ufromfpx, and float and long double variants) to convert from
floating-point to an integer type with any signedness and any given
width up to that of intmax_t, in any of the five IEEE rounding modes
(the usual four for binary floating point, plus rounding to nearest
with ties rounding away from zero), with control of whether in-range
non-integer values should result in the "inexact" exception being
raised. This patch implements these functions for glibc.
These implementations are (apart from raising exceptions) pure integer
implementations; it's entirely possible optimized versions could be
devised for some architectures. A common math/fromfp.h header
provides various common helper code that can readily be shared between
the implementations for different types. For each type, the bulk of
the implementation is also shared between the four functions, with
wrappers that define UNSIGNED and INEXACT macros appropriately before
including the main implementation.
As the functions return intmax_t and uintmax_t without math.h being
allowed to expose those typedef names, they are declared using
__intmax_t and __uintmax_t as obtained from <bits/types.h>.
The FP_INT_* rounding direction macros are defined as ascending
integers in the order the names are listed in the TS; I see no
significant value in allowing architectures to vary the values of
them.
The libm-test machinery is duly adapted to handle unsigned int
arguments, and intmax_t and uintmax_t results. Because each test
input is generally tested for four functions, five rounding modes and
several different widths, the libm-test.inc additions are very large.
Thus, the diffs in the body of this message exclude the libm-test.inc
changes, with the full patch being attached gzipped. The bulk of the
new tests were generated (expanded from a test input plus rounding
results and information about where it lies in the relevant interval
between integers, to libm-test tests for all relevant combinations of
function, rounding direction and width) by a script that's included in
the patch as math/gen-fromfp-tests.py (input data
math/gen-fromfp-tests-inputs); as an ad hoc script that's not really
expected to be rerun, it's not very polished, but it's at least
plausibly useful for adding any further tests for these functions in
future. I may split the libm-test tests up by function in future (so
both libm-test.inc and auto-libm-test-out are split into separate
files, and the tests for each function are also built and run
separately), but not for 2.25.
For no obvious reason, adding tgmath tests for the new functions
resulted in -Wuninitialized errors from test-tgmath.c about the
variable i being used uninitialized. Those errors were correct - the
variable is read by the frexp version in test-tgmath.c (where real
frexp would write through that pointer instead of reading it) - but I
don't know why this patch would result in the pre-existing issue being
newly detected. The patch initializes the variable to avoid those
errors.
With these changes, glibc 2.25 should have all the library features
from TS 18661-1 other than the functions that round result to narrower
type (and constant rounding directions, but I'm considering those
mainly a compiler feature not a library one).
Tested for x86_64, x86, mips64 and powerpc.
* math/bits/mathcalls.h [__GLIBC_USE (IEC_60559_BFP_EXT)]
(fromfp): New declaration.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (fromfpx): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (ufromfp): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (ufromfpx): Likewise.
* math/tgmath.h (__TGMATH_TERNARY_FIRST_REAL_RET_ONLY): New macro.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (fromfp): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (ufromfp): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (fromfpx): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (ufromfpx): Likewise.
* math/math.h: Include <bits/types.h>.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (FP_INT_UPWARD): New enum
constant and macro.
(FP_INT_DOWNWARD): Likewise.
(FP_INT_TOWARDZERO): Likewise.
(FP_INT_TONEARESTFROMZERO): Likewise.
(FP_INT_TONEAREST): Likewise.
* math/Versions (fromfp): New libm symbol at version GLIBC_2.25.
(fromfpf): Likewise.
(fromfpl): Likewise.
(ufromfp): Likewise.
(ufromfpf): Likewise.
(ufromfpl): Likewise.
(fromfpx): Likewise.
(fromfpxf): Likewise.
(fromfpxl): Likewise.
(ufromfpx): Likewise.
(ufromfpxf): Likewise.
(ufromfpxl): Likewise.
* math/Makefile (libm-calls): Add s_fromfpF, s_ufromfpF,
s_fromfpxF and s_ufromfpxF.
* math/gen-fromfp-tests.py: New file.
* math/gen-fromfp-tests-inputs: Likewise.
* math/libm-test.inc: Include <stdint.h>
(check_intmax_t): New function.
(check_uintmax_t): Likewise.
(struct test_fiu_M_data): New type.
(struct test_fiu_U_data): Likewise.
(RUN_TEST_fiu_M): New macro.
(RUN_TEST_LOOP_fiu_M): Likewise.
(RUN_TEST_fiu_U): Likewise.
(RUN_TEST_LOOP_fiu_U): Likewise.
(fromfp_test_data): New array.
(fromfp_test): New function.
(fromfpx_test_data): New array.
(fromfpx_test): New function.
(ufromfp_test_data): New array.
(ufromfp_test): New function.
(ufromfpx_test_data): New array.
(ufromfpx_test): New function.
(main): Call fromfp_test, fromfpx_test, ufromfp_test and
ufromfpx_test.
* math/gen-libm-test.pl (parse_args): Handle u, M and U descriptor
characters.
* math/test-tgmath-ret.c: Include <stdint.h>.
(rm): New variable.
(width): Likewise.
(CHECK_RET_CONST_TYPE): Take extra arguments and pass them to
called function.
(CHECK_RET_CONST_FLOAT): Take extra arguments and pass them to
CHECK_RET_CONST_TYPE.
(CHECK_RET_CONST_DOUBLE): Likewise.
(CHECK_RET_CONST_LDOUBLE): Likewise.
(CHECK_RET_CONST): Take extra arguments and pass them to calls
macros.
(fromfp): New CHECK_RET_CONST call.
(ufromfp): Likewise.
(fromfpx): Likewise.
(ufromfpx): Likewise.
(do_test): Call check_return_fromfp, check_return_ufromfp,
check_return_fromfpx and check_return_ufromfpx.
* math/test-tgmath.c: Include <stdint.h>
(NCALLS): Increase to 138.
(F(compile_test)): Initialize i. Call fromfp functions.
(F(fromfp)): New function.
(F(fromfpx)): Likewise.
(F(ufromfp)): Likewise.
(F(ufromfpx)): Likewise.
* manual/arith.texi (Rounding Functions): Document FP_INT_UPWARD,
FP_INT_DOWNWARD, FP_INT_TOWARDZERO, FP_INT_TONEARESTFROMZERO,
FP_INT_TONEAREST, fromfp, fromfpf, fromfpl, ufromfp, ufromfpf,
ufromfpl, fromfpx, fromfpxf, fromfpxl, ufromfpx, ufromfpxf and
ufromfpxl.
* manual/libm-err-tab.pl (@all_functions): Add fromfp, fromfpx,
ufromfp and ufromfpx.
* math/fromfp.h: New file.
* sysdeps/ieee754/dbl-64/s_fromfp.c: Likewise.
* sysdeps/ieee754/dbl-64/s_fromfp_main.c: Likewise.
* sysdeps/ieee754/dbl-64/s_fromfpx.c: Likewise.
* sysdeps/ieee754/dbl-64/s_ufromfp.c: Likewise.
* sysdeps/ieee754/dbl-64/s_ufromfpx.c: Likewise.
* sysdeps/ieee754/flt-32/s_fromfpf.c: Likewise.
* sysdeps/ieee754/flt-32/s_fromfpf_main.c: Likewise.
* sysdeps/ieee754/flt-32/s_fromfpxf.c: Likewise.
* sysdeps/ieee754/flt-32/s_ufromfpf.c: Likewise.
* sysdeps/ieee754/flt-32/s_ufromfpxf.c: Likewise.
* sysdeps/ieee754/ldbl-128/s_fromfpl.c: Likewise.
* sysdeps/ieee754/ldbl-128/s_fromfpl_main.c: Likewise.
* sysdeps/ieee754/ldbl-128/s_fromfpxl.c: Likewise.
* sysdeps/ieee754/ldbl-128/s_ufromfpl.c: Likewise.
* sysdeps/ieee754/ldbl-128/s_ufromfpxl.c: Likewise.
* sysdeps/ieee754/ldbl-128ibm/s_fromfpl.c: Likewise.
* sysdeps/ieee754/ldbl-128ibm/s_fromfpl_main.c: Likewise.
* sysdeps/ieee754/ldbl-128ibm/s_fromfpxl.c: Likewise.
* sysdeps/ieee754/ldbl-128ibm/s_ufromfpl.c: Likewise.
* sysdeps/ieee754/ldbl-128ibm/s_ufromfpxl.c: Likewise.
* sysdeps/ieee754/ldbl-96/s_fromfpl.c: Likewise.
* sysdeps/ieee754/ldbl-96/s_fromfpl_main.c: Likewise.
* sysdeps/ieee754/ldbl-96/s_fromfpxl.c: Likewise.
* sysdeps/ieee754/ldbl-96/s_ufromfpl.c: Likewise.
* sysdeps/ieee754/ldbl-96/s_ufromfpxl.c: Likewise.
* sysdeps/ieee754/ldbl-opt/Makefile (libnldbl-calls): Add fromfp,
ufromfp, fromfpx and ufromfpx.
(CFLAGS-nldbl-fromfp.c): New variable.
(CFLAGS-nldbl-fromfpx.c): Likewise.
(CFLAGS-nldbl-ufromfp.c): Likewise.
(CFLAGS-nldbl-ufromfpx.c): Likewise.
* sysdeps/ieee754/ldbl-opt/nldbl-compat.h: Include <stdint.h>.
* sysdeps/ieee754/ldbl-opt/nldbl-fromfp.c: New file.
* sysdeps/ieee754/ldbl-opt/nldbl-fromfpx.c: Likewise.
* sysdeps/ieee754/ldbl-opt/nldbl-ufromfp.c: Likewise.
* sysdeps/ieee754/ldbl-opt/nldbl-ufromfpx.c: Likewise.
* sysdeps/nacl/libm.abilist: Update.
* sysdeps/unix/sysv/linux/aarch64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/alpha/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/arm/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/hppa/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/i386/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/ia64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/m68k/coldfire/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/m68k/m680x0/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/microblaze/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/mips/mips32/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/mips/mips64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/nios2/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libm.abilist:
Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libm.abilist:
Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/libm-le.abilist:
Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/libm.abilist:
Likewise.
* sysdeps/unix/sysv/linux/s390/s390-32/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/s390/s390-64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/sh/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/sparc/sparc32/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/sparc/sparc64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libm.abilist:
Likewise.
* sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libm.abilist:
Likewise.
* sysdeps/unix/sysv/linux/tile/tilepro/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/x86_64/64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/x86_64/x32/libm.abilist: Likewise.
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TS 18661-1 defines roundeven functions that round a floating-point
number to the nearest integer, in that floating-point type, with ties
rounding to even (whereas the round functions round ties away from
zero). As with other such functions, they raise no exceptions apart
from "invalid" for signaling NaNs. There was a previous user request
for this functionality in glibc in
<https://sourceware.org/ml/libc-help/2015-02/msg00005.html>.
This patch implements these functions for glibc. The implementations
use integer bit-manipulation (or roundeven on the high and low parts,
in the IBM long double case). It's possible that there may be faster
approaches on some architectures (in particular, on AArch64 the frintn
instruction should do exactly what's required); I'll leave it to
architecture maintainers or others interested to implement such
architecture-specific versions if desired. (Where architectures have
instructions to round to nearest integer in the current rounding mode,
implementations saving and restoring the rounding mode - and dealing
with exceptions if those instructions generate "inexact" - are also
possible, though their performance depends on the cost of manipulating
exceptions / rounding mode state.)
Tested for x86_64, x86, mips64 and powerpc.
* math/bits/mathcalls.h [__GLIBC_USE (IEC_60559_BFP_EXT)]
(roundeven): New declaration.
* math/tgmath.h [__GLIBC_USE (IEC_60559_BFP_EXT)] (roundeven): New
macro.
* math/Versions (roundeven): New libm symbol at version
GLIBC_2.25.
(roundevenf): Likewise.
(roundevenl): Likewise.
* math/Makefile (libm-calls): Add s_roundevenF.
* math/libm-test.inc (roundeven_test_data): New array.
(roundeven_test): New function.
(main): Call roundeven_test.
* math/test-tgmath.c (NCALLS): Increase to 134.
(F(compile_test)): Call roundeven.
(F(roundeven)): New function.
* manual/arith.texi (Rounding Functions): Document roundeven,
roundevenf and roundevenl.
* manual/libm-err-tab.pl (@all_functions): Add roundeven.
* include/math.h (roundeven): Use libm_hidden_proto.
* sysdeps/ieee754/dbl-64/s_roundeven.c: New file.
* sysdeps/ieee754/dbl-64/wordsize-64/s_roundeven.c: Likewise.
* sysdeps/ieee754/flt-32/s_roundevenf.c: Likewise.
* sysdeps/ieee754/ldbl-128/s_roundevenl.c: Likewise.
* sysdeps/ieee754/ldbl-128ibm/s_roundevenl.c: Likewise.
* sysdeps/ieee754/ldbl-96/s_roundevenl.c: Likewise.
* sysdeps/ieee754/ldbl-opt/Makefile (libnldbl-calls): Add
roundeven.
(CFLAGS-nldbl-roundeven.c): New variable.
* sysdeps/ieee754/ldbl-opt/nldbl-roundeven.c: New file.
* sysdeps/nacl/libm.abilist: Update.
* sysdeps/unix/sysv/linux/aarch64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/alpha/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/arm/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/hppa/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/i386/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/ia64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/m68k/coldfire/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/m68k/m680x0/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/microblaze/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/mips/mips32/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/mips/mips64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/nios2/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libm.abilist:
Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libm.abilist:
Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/libm-le.abilist:
Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/libm.abilist:
Likewise.
* sysdeps/unix/sysv/linux/s390/s390-32/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/s390/s390-64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/sh/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/sparc/sparc32/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/sparc/sparc64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libm.abilist:
Likewise.
* sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libm.abilist:
Likewise.
* sysdeps/unix/sysv/linux/tile/tilepro/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/x86_64/64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/x86_64/x32/libm.abilist: Likewise.
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* math/tgmath.h [__GLIBC_USE (IEC_60559_BFP_EXT)] (llogb): Add
preprocessor indentation inside #if.
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In order to support float128 tests, the calls to snprintf, which does
not support the type __float128, are replaced with calls to
strfrom{f,d,l}.
Tested for powerpc64le, s390, and x64_64.
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TS 18661-1 defines fmaxmag and fminmag functions that return the
argument with maximum / minimum magnitude (acting like fmax / fmin if
the arguments have the same magnitude or either argument is a NaN).
These correspond to the IEEE 754-2008 operations maxNumMag and
minNumMag. This patch implements these functions for glibc. They are
implemented with type-generic templates. Tests are based on those for
fmax and fmin.
Tested for x86_64, x86, mips64 and powerpc.
* math/bits/mathcalls.h [__GLIBC_USE (IEC_60559_BFP_EXT)]
(fmaxmag): New declaration.
(fminmag): Likewise.
* math/tgmath.h [__GLIBC_USE (IEC_60559_BFP_EXT)] (fmaxmag): New
macro.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (fminmag): Likewise.
* math/Versions (fmaxmag): New libm symbol at version GLIBC_2.25.
(fmaxmagf): Likewise.
(fmaxmagl): Likewise.
(fminmag): Likewise.
(fminmagf): Likewise.
(fminmagl): Likewise.
* math/Makefile (gen-libm-calls): Add s_fmaxmagF and s_fminmagF.
* math/s_fmaxmag_template.c: New file.
* math/s_fminmag_template.c: Likewise.
* math/libm-test.inc (fmaxmag_test_data): New array.
(fmaxmag_test): New function.
(fminmag_test_data): New array.
(fminmag_test): New function.
(main): Call fmaxmag_test and fminmag_test.
* math/test-tgmath.c (NCALLS): Increase to 132.
(F(compile_test)): Call fmaxmag and fminmag.
(F(fminmag)): New function.
(F(fmaxmag)): Likewise.
* manual/arith.texi (Misc FP Arithmetic): Document fminmag,
fminmagf, fminmagl, fmaxmag, fmaxmagf and fmaxmagl.
* manual/libm-err-tab.pl (@all_functions): Add fmaxmag and
fminmag.
* sysdeps/ieee754/ldbl-opt/nldbl-fmaxmag.c: New file.
* sysdeps/ieee754/ldbl-opt/nldbl-fminmag.c: Likewise.
* sysdeps/ieee754/ldbl-opt/s_fmaxmagl.c: Likewise.
* sysdeps/ieee754/ldbl-opt/s_fminmagl.c: Likewise.
* sysdeps/ieee754/ldbl-opt/Makefile (libnldbl-calls): Add fmaxmag
and fminmag.
(CFLAGS-nldbl-fmaxmag.c): New variable.
(CFLAGS-nldbl-fminmag.c): Likewise.
* sysdeps/nacl/libm.abilist: Update.
* sysdeps/unix/sysv/linux/aarch64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/alpha/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/arm/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/hppa/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/i386/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/ia64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/m68k/coldfire/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/m68k/m680x0/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/microblaze/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/mips/mips32/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/mips/mips64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/nios2/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libm.abilist:
Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libm.abilist:
Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/libm-le.abilist:
Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/libm.abilist:
Likewise.
* sysdeps/unix/sysv/linux/s390/s390-32/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/s390/s390-64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/sh/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/sparc/sparc32/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/sparc/sparc64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libm.abilist:
Likewise.
* sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libm.abilist:
Likewise.
* sysdeps/unix/sysv/linux/tile/tilepro/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/x86_64/64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/x86_64/x32/libm.abilist: Likewise.
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TS 18661-1 defines a macro FE_SNANS_ALWAYS_SIGNAL in <fenv.h>, to
indicate that the recommended practice regarding sNaNs (that
operations always produce a qNaN output with "invalid" exception, even
in the fmax / fmin / hypot / pow cases where a qNaN input would not
result in qNaN output) is followed.
Now that those functions with C99 special cases for NaNs have been
fixed not to apply those special cases to sNaN, only to qNaN, glibc
follows that recommended practice. This patch makes it define the
corresponding macro.
Since compiler optimizations may affect whether sNaNs behave as
expected and the macro relates to both language and library features,
it is only defined if __SUPPORT_SNAN__ is defined (which GCC defines
for -fsignaling-nans). It is also not defined if FE_INVALID is
undefined, since the recommended practice specifically refers to
raising the "invalid" exception, so it seems inappropriate to define
the macro for soft-float cases without support for exceptions.
(Further refinement would be possible in cases where bits/fenv.h is
shared by configurations both with and without exceptions support.)
Tested for x86_64 and x86, and also did compile-only testing for nios2
to cover the no-exceptions case.
* math/fenv.h
[__GLIBC_USE (IEC_60559_BFP_EXT) && FE_INVALID && __SUPPORT_SNAN__]
(FE_SNANS_ALWAYS_SIGNAL): New macro.
* math/test-fe-snans-always-signal.c: New file.
* math/Makefile (tests): Add test-fe-snans-always-signal.
(CFLAGS-test-fe-snans-always-signal.c): New variable.
* manual/arith.texi (Infinity and NaN): Document
FE_SNANS_ALWAYS_SIGNAL.
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This patch converts the wrapper scalbln (which set errno directly
rather than doing anything with __kernel_standard) to use the
type-generic template machinery, in the same way that has been done
for ldexp.
Tested for powerpc64le, s390, and x86_64.
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Various fmax and fmin function implementations mishandle sNaN
arguments:
(a) When both arguments are NaNs, the return value should be a qNaN,
but sometimes it is an sNaN if at least one argument is an sNaN.
(b) Under TS 18661-1 semantics, if either argument is an sNaN then the
result should be a qNaN (whereas if one argument is a qNaN and the
other is not a NaN, the result should be the non-NaN argument).
Various implementations treat sNaNs like qNaNs here.
This patch fixes the x86 and x86_64 versions (ignoring float and
double for 32-bit x86 given the inability to reliably avoid the sNaN
turning into a qNaN before it gets to the called function). Tests of
sNaN inputs to these functions are added.
Note on architecture versions I haven't changed for this issue:
AArch64 already gets this right (it uses a hardware instruction with
the correct semantics for both quiet and signaling NaNs) and does not
need changes. It's possible Alpha, IA64, SPARC might need changes
(this would be shown by the testsuite if so).
Tested for x86_64 and x86 (both i686 and i586 builds, to cover the
different x86 implementations).
[BZ #20947]
* sysdeps/i386/fpu/s_fmaxl.S (__fmaxl): Add the arguments when
either is a signaling NaN.
* sysdeps/i386/fpu/s_fminl.S (__fminl): Likewise. Make code
follow fmaxl more closely.
* sysdeps/i386/i686/fpu/s_fmaxl.S (__fmaxl): Add the arguments
when either is a signaling NaN.
* sysdeps/i386/i686/fpu/s_fminl.S (__fminl): Likewise.
* sysdeps/x86_64/fpu/s_fmax.S (__fmax): Likewise.
* sysdeps/x86_64/fpu/s_fmaxf.S (__fmaxf): Likewise.
* sysdeps/x86_64/fpu/s_fmaxl.S (__fmaxl): Likewise.
* sysdeps/x86_64/fpu/s_fmin.S (__fmin): Likewise.
* sysdeps/x86_64/fpu/s_fminf.S (__fminf): Likewise.
* sysdeps/x86_64/fpu/s_fminl.S (__fminl): Likewise.
* math/libm-test.inc (fmax_test_data): Add tests of sNaN inputs.
(fmin_test_data): Likewise.
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Various fmax and fmin function implementations mishandle sNaN
arguments:
(a) When both arguments are NaNs, the return value should be a qNaN,
but sometimes it is an sNaN if at least one argument is an sNaN.
(b) Under TS 18661-1 semantics, if either argument is an sNaN then the
result should be a qNaN (whereas if one argument is a qNaN and the
other is not a NaN, the result should be the non-NaN argument).
Various implementations treat sNaNs like qNaNs here.
This patch fixes the generic implementations used in the absence of
architecture-specific versions.
Tested for mips64 and powerpc (together with testcases that I'll add
along with the x86_64 / x86 fixes).
[BZ #20947]
* math/s_fmax_template.c (M_DECL_FUNC (__fmax)): Add the arguments
when either is a signaling NaN.
* math/s_fmin_template.c (M_DECL_FUNC (__fmin)): Likewise.
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Information about whether the ABI of long double is the same as that
of double is split between bits/mathdef.h and bits/wordsize.h.
When the ABIs are the same, bits/mathdef.h defines
__NO_LONG_DOUBLE_MATH. In addition, in the case where the same glibc
binary supports both -mlong-double-64 and -mlong-double-128,
bits/wordsize.h defines __LONG_DOUBLE_MATH_OPTIONAL, along with
__NO_LONG_DOUBLE_MATH if this particular compilation is with
-mlong-double-64.
As part of the refactoring I proposed in
<https://sourceware.org/ml/libc-alpha/2016-11/msg00745.html>, this
patch puts all that information in a single header,
bits/long-double.h. It is included from sys/cdefs.h alongside the
include of bits/wordsize.h, so other headers generally do not need to
include bits/long-double.h directly.
Previously, various bits/mathdef.h headers and bits/wordsize.h headers
had this long double information (including implicitly in some
bits/mathdef.h headers through not having the defines present in the
default version). After the patch, it's all in six bits/long-double.h
headers. Furthermore, most of those new headers are not
architecture-specific. Architectures with optional long double all
use the ldbl-opt sysdeps directory, either in the order (ldbl-64-128,
ldbl-opt, ldbl-128) or (ldbl-128ibm, ldbl-opt). Thus a generic header
for the case where long double = double, and headers in ldbl-128,
ldbl-96 and ldbl-opt, suffices to cover every architecture except for
cases where long double properties vary between different ABIs sharing
a set of installed headers; fortunately all the ldbl-opt cases share a
single compiler-predefined macro __LONG_DOUBLE_128__ that can be used
to tell whether this compilation is -mlong-double-64 or
-mlong-double-128.
The two cases where a set of headers is shared between ABIs with
different long double properties, MIPS (o32 has long double = double,
other ABIs use ldbl-128) and SPARC (32-bit has optional long double,
64-bit has required long double), need their own bits/long-double.h
headers.
As with bits/wordsize.h, multiple-include protection for this header
is generally implicit through the include guards on sys/cdefs.h, and
multiple inclusion is harmless in any case. There is one subtlety:
the header must not define __LONG_DOUBLE_MATH_OPTIONAL if
__NO_LONG_DOUBLE_MATH was defined before its inclusion, because doing
so breaks how sysdeps/ieee754/ldbl-opt/nldbl-compat.h defines
__NO_LONG_DOUBLE_MATH itself before including system headers. Subject
to keeping that working, it would be reasonable to move these macros
from defined/undefined #ifdef to always-defined 1/0 #if semantics, but
this patch does not attempt to do so, just rearranges where the macros
are defined.
After this patch, the only use of bits/mathdef.h is the alpha one for
modifying complex function ABIs for old GCC. Thus, all versions of
the header other than the default and alpha versions are removed, as
is the include from math.h.
Tested for x86_64 and x86. Also did compilation-only testing with
build-many-glibcs.py.
* bits/long-double.h: New file.
* sysdeps/ieee754/ldbl-128/bits/long-double.h: Likewise.
* sysdeps/ieee754/ldbl-96/bits/long-double.h: Likewise.
* sysdeps/ieee754/ldbl-opt/bits/long-double.h: Likewise.
* sysdeps/mips/bits/long-double.h: Likewise.
* sysdeps/unix/sysv/linux/sparc/bits/long-double.h: Likewise.
* math/Makefile (headers): Add bits/long-double.h.
* misc/sys/cdefs.h: Include <bits/long-double.h>.
* stdlib/strtold.c: Include <bits/long-double.h> instead of
<bits/wordsize.h>.
* bits/mathdef.h [!_COMPLEX_H]: Do not allow inclusion.
[!__NO_LONG_DOUBLE_MATH]: Remove conditional code.
* math/math.h: Do not include <bits/mathdef.h>.
* sysdeps/aarch64/bits/mathdef.h: Remove file.
* sysdeps/alpha/bits/mathdef.h [!_COMPLEX_H]: Do not allow
inclusion.
* sysdeps/ia64/bits/mathdef.h: Remove file.
* sysdeps/m68k/m680x0/bits/mathdef.h: Likewise.
* sysdeps/mips/bits/mathdef.h: Likewise.
* sysdeps/powerpc/bits/mathdef.h: Likewise.
* sysdeps/s390/bits/mathdef.h: Likewise.
* sysdeps/sparc/bits/mathdef.h: Likewise.
* sysdeps/x86/bits/mathdef.h: Likewise.
* sysdeps/s390/s390-32/bits/wordsize.h
[!__NO_LONG_DOUBLE_MATH && !__LONG_DOUBLE_MATH_OPTIONAL]: Remove
conditional code.
* sysdeps/s390/s390-64/bits/wordsize.h
[!__NO_LONG_DOUBLE_MATH && !__LONG_DOUBLE_MATH_OPTIONAL]:
Likewise.
* sysdeps/unix/sysv/linux/alpha/bits/wordsize.h
[!__NO_LONG_DOUBLE_MATH && !__LONG_DOUBLE_MATH_OPTIONAL]:
Likewise.
* sysdeps/unix/sysv/linux/powerpc/bits/wordsize.h
[!__NO_LONG_DOUBLE_MATH && !__LONG_DOUBLE_MATH_OPTIONAL]:
Likewise.
* sysdeps/unix/sysv/linux/sparc/bits/wordsize.h
[!__NO_LONG_DOUBLE_MATH && !__LONG_DOUBLE_MATH_OPTIONAL]:
Likewise.
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This patch converts the wrapper log1p (which set errno directly rather
than doing anything with __kernel_standard) to use the type-generic
template machinery, in the same way that has been done for ilogb.
Tested for powerpc64le, s390, and x86_64.
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* math/Makefile ($(inst_libdir)/libm-$(version).a): New target.
* ($(inst_libdir)/libm.a): Fix rule to create the target only.
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Install libm.a as linker script to avoid static link fail w/o passing
additional -lmvec option while building with GCC >= 6.1.
[BZ #20539]
* math/Makefile (install-lib-ldscripts): Add libm.a.
(install_subdir): Remove.
(install-others): Add.
($(inst_libdir)/libm.a): Add rule for installation as
linker script.
* Makerules (install-lib.a): Filter out install-lib-ldscripts.
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TS 18661-1 generally defines libm functions taking sNaN arguments to
return qNaN and raise "invalid", even for the cases where a
corresponding qNaN argument would not result in a qNaN return. This
includes hypot with one argument being an infinity and the other being
an sNaN. This patch duly fixes hypot implementatations in glibc
(generic and powerpc) to ensure qNaN, computed by arithmetic on the
arguments, is returned in that case.
Various implementations do their checks for infinities and NaNs inline
by manipulating the representations of the arguments. For simplicity,
this patch just uses issignaling to check for sNaN arguments. This
could be inlined like the existing code (with due care about reversed
quiet NaN conventions, for implementations where that is relevant),
but given that all these checks are in cases where it's already known
at least one argument is not finite, which should be the uncommon
case, that doesn't seem worthwhile unless performance issues are
observed in practice.
Tested for x86_64, x86, mips64 and powerpc.
[BZ #20940]
* sysdeps/ieee754/dbl-64/e_hypot.c (__ieee754_hypot): Do not
return Inf for arguments Inf and sNaN.
* sysdeps/ieee754/flt-32/e_hypotf.c (__ieee754_hypotf): Likewise.
* sysdeps/ieee754/ldbl-128/e_hypotl.c (__ieee754_hypotl):
Likewise.
* sysdeps/ieee754/ldbl-128ibm/e_hypotl.c (__ieee754_hypotl):
Likewise.
* sysdeps/ieee754/ldbl-96/e_hypotl.c (__ieee754_hypotl): Likewise.
* sysdeps/powerpc/fpu/e_hypot.c (TEST_INF_NAN): Do not return Inf
for arguments Inf and sNaN. When returning a NaN, compute it by
arithmetic on the arguments.
* sysdeps/powerpc/fpu/e_hypotf.c (TEST_INF_NAN): Likewise.
* math/libm-test.inc (pow_test_data): Add tests of sNaN arguments.
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The x86_64/x86 powl implementations mishandle sNaN arguments, both by
returning sNaN in some cases (instead of doing arithmetic on the
arguments to produce the result when NaN arguments result in NaN
results) and by treating sNaN the same as qNaN for arguments (1, sNaN)
and (sNaN, 0), contrary to TS 18661-1 which requires those cases to
return qNaN instead of 1.
This patch makes the x86_64/x86 powl implementations follow TS 18661-1
semantics for sNaN arguments; sNaN tests are also added for pow.
Given the problems with testing float and double sNaN arguments on
32-bit x86 (sNaN tests disabled because the compiler may convert
unnecessarily to a qNaN when passing arguments), no changes are made
to the powf and pow implementations there.
Tested for x86_64 and x86.
[BZ #20916]
* sysdeps/i386/fpu/e_powl.S (__ieee754_powl): Do not return 1 for
arguments (sNaN, 0) or (1, sNaN). Do arithmetic on NaN arguments
to compute result.
* sysdeps/x86_64/fpu/e_powl.S (__ieee754_powl): Likewise.
* math/libm-test.inc (pow_test_data): Add tests of sNaN arguments.
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The dbl-64 implementation of __ieee754_pow returns a NaN for pow
(qNaN, 0) when it should return 1. Normally this is covered up by the
wrappers ending up calling __kernel_standard which fixes up the result
for this case, but for -lieee the wrappers are bypassed and the bad
result gets through as a return value.
Now, the wrappers fixing this are dealing with variant error handling
that wants a result of NaN for pow (qNaN, 0), and only ever call
__kernel_standard for this case if NaN resulted from __ieee754_pow.
This leads to a question of whether the dbl-64 code might be
deliberately returning NaN in order to use those code paths. However,
I can find no sign that this is deliberate. If it were deliberate one
would expect other implementations to do the same, and would expect
the return of NaN to be very old, but it appears it came in by
accident when the present e_pow.c implementation replaced an fdlibm
implementation in 2001. So it appears to be unintended that this path
through the pow wrapper could be used at all.
So this patch fixes the implementation to return 1 in this case as
expected. This is consistent with all the other implementations. The
relevant path through the wrappers is now unreachable, so is removed
(which is the main motivation of this patch: to avoid that path
becoming accidentally reachable when implementing TS 18661-1 semantics
that pow (sNaN, 0) should return qNaN with "invalid" raised). Another
path that would require __ieee754_pow (0, 0) to return 0 is also
unreachable (as all implementations return 1, in accordance with C99
semantics), so is removed as well.
Note: we don't have anything set up to test -lieee, which in any case
is obsolescent (at some point we should remove the ability for new
programs to access _LIB_VERSION or define matherr and have it called
by glibc). So testing will be implicit through sNaN tests added when
making sNaN inputs work correctly for pow functions.
Tested for x86_64 and x86.
[BZ #20919]
* sysdeps/ieee754/dbl-64/e_pow.c (__ieee754_pow): Do not return
NaN first argument when raised to power 0.
* math/w_pow.c (__pow): Do not check for NaN or zero results from
raising to power zero.
* math/w_powf.c (__powf): Likewise.
* math/w_powl.c (__powl): Likewise.
* sysdeps/ieee754/k_standard.c (__kernel_standard): Do not handle
pow (0, 0) or pow (NaN, 0).
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TS 18661-1 defines llogb functions that are like ilogb except that
they return long int instead of int. Corresponding FP_LLOGB* macros
are defined, whose values are required to have the obvious
correspondence to those of the FP_ILOGB* macros.
This patch implements these functions and macros for glibc. llogb
uses the type-generic infrastructure, with an implementation similar
to the wrapper for ilogb but with additional conversion from FP_ILOGB*
to FP_LLOGB*; this approach avoids needing to modify or duplicate any
of the architecture-specific ilogb implementations. Tests are also
based on those for ilogb.
Ideally the llogb functions would alias the ilogb ones when long is
32-bit, but such aliasing requires the associated header declarations
of the different-type alias to be hidden, typically by defining macros
before including the header (see e.g. how
sysdeps/ieee754/dbl-64/wordsize-64/s_llround.c defines lround to
__hidden_lround before including <math.h>). The infrastructure for
type-generic function implementations does not support defining such
macros at present (since C code can't define a macro whose name is
determined by other macros). So this patch leaves them as separate
functions (similar to e.g. scalbln and scalbn being separate in such a
case as well), but with the remapping of FP_ILOGB* to FP_LLOGB*
conditioned out in the case where it would be the identity map.
Tested for x86_64, x86, mips64 and powerpc.
* math/bits/mathcalls.h [__GLIBC_USE (IEC_60559_BFP_EXT)] (llogb):
New declaration.
* math/tgmath.h [__GLIBC_USE (IEC_60559_BFP_EXT)] (llogb): New
macro.
* math/math.h [__GLIBC_USE (IEC_60559_BFP_EXT)] (__FP_LONG_MAX):
New macro.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (FP_LLOGB0): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (FP_LLOGBNAN): Likewise.
* math/Versions (llogb): New libm symbol at version GLIBC_2.25.
(llogbf): Likewise.
(llogbl): Likewise.
* math/Makefile (gen-libm-calls): Add w_llogbF.
(tests): Add test-fp-llogb-constants.
* math/w_llogb_template.c: New file. Based on
math/w_ilogb_template.c.
* math/libm-test.inc (llogb_test_data): New array.
(llogb_test): New function.
(main): Call llogb_test.
* math/test-fp-llogb-constants.c: New file. Based on
math/test-fp-ilogb-constants.c.
* math/test-tgmath-ret.c (llogb): New CHECK_RET_CONST call.
(do_test): Call check_return_llogb.
* math/test-tgmath.c (NCALLS): Increase to 126.
(F(compile_test)): Call llogb.
(F(llogb)): New function.
* manual/math.texi (Exponents and Logarithms): Document llogb,
llogbf, llogbl, FP_LLOGB0 and FP_LLOGBNAN.
* manual/libm-err-tab.pl (@all_functions): Add llogb.
* sysdeps/ieee754/ldbl-opt/nldbl-llogb.c: New file.
* sysdeps/ieee754/ldbl-opt/w_llogbl.c: Likewise.
* sysdeps/ieee754/ldbl-opt/Makefile (libnldbl-calls): Add llogb.
(CFLAGS-nldbl-llogb.c): New variable.
* sysdeps/nacl/libm.abilist: Update.
* sysdeps/unix/sysv/linux/aarch64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/alpha/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/arm/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/hppa/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/i386/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/ia64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/m68k/coldfire/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/m68k/m680x0/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/microblaze/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/mips/mips32/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/mips/mips64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/nios2/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libm.abilist:
Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libm.abilist:
Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/libm-le.abilist:
Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/libm.abilist:
Likewise.
* sysdeps/unix/sysv/linux/s390/s390-32/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/s390/s390-64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/sh/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/sparc/sparc32/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/sparc/sparc64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libm.abilist:
Likewise.
* sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libm.abilist:
Likewise.
* sysdeps/unix/sysv/linux/tile/tilepro/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/x86_64/64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/x86_64/x32/libm.abilist: Likewise.
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Continuing the refactoring of bits/mathdef.h, this patch stops it
defining FP_ILOGB0 and FP_ILOGBNAN, moving the required information to
a new header bits/fp-logb.h.
There are only two possible values of each of those macros permitted
by ISO C. TS 18661-1 adds corresponding macros for llogb, and their
values are required to correspond to those of the ilogb macros in the
obvious way. Thus two boolean values - for which the same choices are
correct for most architectures - suffice to determine the value of all
these macros, and by defining macros for those boolean values in
bits/fp-logb.h we can then define the public FP_* macros in math.h and
avoid the present duplication of the associated feature test macro
logic.
This patch duly moves to bits/fp-logb.h defining __FP_LOGB0_IS_MIN and
__FP_LOGBNAN_IS_MIN. Default definitions of those to 0 are correct
for both architectures, while ia64, m68k and x86 get their own
versions of bits/fp-logb.h to reflect their use of values different
from the defaults.
The patch renders many copies of bits/mathdef.h trivial (needed only
to avoid the default __NO_LONG_DOUBLE_MATH). I'll revise
<https://sourceware.org/ml/libc-alpha/2016-11/msg00865.html>
accordingly so that it removes all bits/mathdef.h headers except the
default one and the alpha one, and arranges for the header to be
included only by complex.h as the only remaining use at that point
will be for the alpha ABI issues there.
Tested for x86_64 and x86. Also did compile-only testing with
build-many-glibcs.py (using glibc sources from before the commit that
introduced many build failures with undefined __GI___sigsetjmp).
* bits/fp-logb.h: New file.
* sysdeps/ia64/bits/fp-logb.h: Likewise.
* sysdeps/m68k/m680x0/bits/fp-logb.h: Likewise.
* sysdeps/x86/bits/fp-logb.h: Likewise.
* math/Makefile (headers): Add bits/fp-logb.h.
* math/math.h: Include <bits/fp-logb.h>.
[__USE_ISOC99] (FP_ILOGB0): Define based on __FP_LOGB0_IS_MIN.
[__USE_ISOC99] (FP_ILOGBNAN): Define based on __FP_LOGBNAN_IS_MIN.
* bits/mathdef.h (FP_ILOGB0): Remove.
(FP_ILOGBNAN): Likewise.
* sysdeps/aarch64/bits/mathdef.h (FP_ILOGB0): Likewise.
(FP_ILOGBNAN): Likewise.
* sysdeps/alpha/bits/mathdef.h (FP_ILOGB0): Likewise.
(FP_ILOGBNAN): Likewise.
* sysdeps/ia64/bits/mathdef.h (FP_ILOGB0): Likewise.
(FP_ILOGBNAN): Likewise.
* sysdeps/m68k/m680x0/bits/mathdef.h (FP_ILOGB0): Likewise.
(FP_ILOGBNAN): Likewise.
* sysdeps/mips/bits/mathdef.h (FP_ILOGB0): Likewise.
(FP_ILOGBNAN): Likewise.
* sysdeps/powerpc/bits/mathdef.h (FP_ILOGB0): Likewise.
(FP_ILOGBNAN): Likewise.
* sysdeps/s390/bits/mathdef.h (FP_ILOGB0): Likewise.
(FP_ILOGBNAN): Likewise.
* sysdeps/sparc/bits/mathdef.h (FP_ILOGB0): Likewise.
(FP_ILOGBNAN): Likewise.
* sysdeps/x86/bits/mathdef.h (FP_ILOGB0): Likewise.
(FP_ILOGBNAN): Likewise.
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Continuing the refactoring of bits/mathdef.h, this patch moves the
FP_FAST_* definitions into a new bits/fp-fast.h header. Currently
this is only for FP_FAST_FMA*, but in future it would be the
appropriate place for the FP_FAST_* macros from TS 18661-1 as well.
The generic bits/mathdef.h header defines these macros based on
whether the compiler defines __FP_FAST_*. Most architecture-specific
headers, however, fail to do so, meaning that if the architecture (or
some particular processors) does in fact have fused operations, and
GCC knows to use them inline, the FP_FAST_* macros will still not be
defined.
By refactoring, this patch causes the generic version (based on
__FP_FAST_*) to be used in more cases, and so the macro definitions to
be more accurate. Architectures that already defined some or all of
these macros other than based on the predefines have their own
versions of fp-fast.h, which are arranged so they define FP_FAST_* if
either the architecture-specific conditions are true or __FP_FAST_*
are defined.
After this refactoring, various bits/mathdef.h headers for
architectures with long double = double are semantically identical to
the generic version. The patch removes those headers that are
redundant. (In fact two of the four removed were already redundant
before this patch because they did use __FP_FAST_*.)
Tested for x86_64 and x86, and compilation-only with
build-many-glibcs.py.
* bits/fp-fast.h: New file.
* sysdeps/aarch64/bits/fp-fast.h: Likewise.
* sysdeps/powerpc/bits/fp-fast.h: Likewise.
* math/Makefile (headers): Add bits/fp-fast.h.
* math/math.h: Include <bits/fp-fast.h>.
* bits/mathdef.h (FP_FAST_FMA): Remove.
(FP_FAST_FMAF): Likewise.
(FP_FAST_FMAL): Likewise.
* sysdeps/aarch64/bits/mathdef.h (FP_FAST_FMA): Likewise.
(FP_FAST_FMAF): Likewise.
* sysdeps/powerpc/bits/mathdef.h (FP_FAST_FMA): Likewise.
(FP_FAST_FMAF): Likewise.
* sysdeps/x86/bits/mathdef.h (FP_FAST_FMA): Likewise.
(FP_FAST_FMAF): Likewise.
(FP_FAST_FMAL): Likewise.
* sysdeps/arm/bits/mathdef.h: Remove file.
* sysdeps/hppa/fpu/bits/mathdef.h: Likewise.
* sysdeps/sh/sh4/bits/mathdef.h: Likewise.
* sysdeps/tile/bits/mathdef.h: Likewise.
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This patch converts the ilogb wrappers (which set errno directly
rather than doing anything with __kernel_standard) to use the
type-generic template machinery. This is intended as preparation for
adding llogb.
Tested for x86_64 and x86, and tested compile for other architectures
with build-many-glibcs.py.
* math/w_ilogb_template.c: New file. Based on math/w_ilogb.c.
* math/w_ilogb.c: Remove.
* math/w_ilogbf.c: Likewise.
* math/w_ilogbl.c: Likewise.
* sysdeps/ieee754/ldbl-opt/w_ilogb.c: Likewise.
* sysdeps/ieee754/ldbl-opt/w_ilogbl.c: Likewise.
* math/Makefile (gen-libm-calls): Add w_ilogbF.
(libm-calls): Remove w_ilogbF.
* sysdeps/ieee754/ldbl-opt/math-type-macros-double.h
(LDOUBLE_ilogbl_libm_version): New macro.
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TS 18661-1 defines functions for manipulating the payloads of NaNs.
This patch implements the setpayloadsig functions for glibc; these are
like the setpayload functions, but produce a signaling NaN instead of
a quiet NaN.
The substance of the implementation was included with the setpayload
implementation, so the new files here just need to wrap the main files
with different defines to build the new functions.
Because the functions store a signaling NaN via a pointer and the
libm-test macros choose a suitable initial value for the variable in
such a case by comparing with the expected value, the relevant macro
needs to clear exceptions after FE_INVALID may have been raised by
that comparison.
Tested for x86_64, x86, mips64 and powerpc.
* math/bits/mathcalls.h [__GLIBC_USE (IEC_60559_BFP_EXT)]
(setpayloadsig): New declaration.
* math/Versions (setpayloadsig): New libm symbol at version
GLIBC_2.25.
(setpayloadsigf): Likewise.
(setpayloadsigl): Likewise.
* math/Makefile (libm-calls): Add s_setpayloadsigF.
* math/libm-test.inc (RUN_TEST_Ff_b1): Call feclearexcept
(FE_ALL_EXCEPT) after initializing EXTRA_VAR.
(setpayloadsig_test_data): New array.
(setpayloadsig_test): New function.
(main): Call setpayloadsig_test.
* manual/arith.texi (FP Bit Twiddling): Document setpayloadsig,
setpayloadsigf and setpayloadsigl.
* manual/libm-err-tab.pl: Update comment on interfaces without
ulps tabulated.
* sysdeps/ieee754/dbl-64/s_setpayloadsig.c: New file.
* sysdeps/ieee754/flt-32/s_setpayloadsigf.c: Likewise.
* sysdeps/ieee754/ldbl-128/s_setpayloadsigl.c: Likewise.
* sysdeps/ieee754/ldbl-128ibm/s_setpayloadsigl.c: Likewise.
* sysdeps/ieee754/ldbl-96/s_setpayloadsigl.c: Likewise.
* sysdeps/ieee754/ldbl-opt/nldbl-setpayloadsig.c: Likewise.
* sysdeps/ieee754/ldbl-opt/Makefile (libnldbl-calls): Add
setpayloadsig.
(CFLAGS-nldbl-setpayloadsig.c): New variable.
* sysdeps/nacl/libm.abilist: Update.
* sysdeps/unix/sysv/linux/aarch64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/alpha/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/arm/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/hppa/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/i386/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/ia64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/m68k/coldfire/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/m68k/m680x0/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/microblaze/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/mips/mips32/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/mips/mips64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/nios2/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libm.abilist:
Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libm.abilist:
Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/libm-le.abilist:
Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/libm.abilist:
Likewise.
* sysdeps/unix/sysv/linux/s390/s390-32/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/s390/s390-64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/sh/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/sparc/sparc32/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/sparc/sparc64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libm.abilist:
Likewise.
* sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libm.abilist:
Likewise.
* sysdeps/unix/sysv/linux/tile/tilepro/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/x86_64/64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/x86_64/x32/libm.abilist: Likewise.
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At present, definitions of float_t and double_t are split among many
bits/mathdef.h headers.
For all but three architectures, these types are float and double.
Furthermore, if you assume __FLT_EVAL_METHOD__ to be defined, that
provides a more generic way of determining the correct values of these
typedefs. Defining these typedefs more generally based on
__FLT_EVAL_METHOD__ was previously proposed by Paul Eggert in
<https://sourceware.org/ml/libc-alpha/2012-02/msg00002.html>.
This patch refactors things in the way I proposed in
<https://sourceware.org/ml/libc-alpha/2016-11/msg00745.html>. A new
header bits/flt-eval-method.h defines a single macro,
__GLIBC_FLT_EVAL_METHOD, which is then used by math.h to define
float_t and double_t. The default is based on __FLT_EVAL_METHOD__
(although actually a default to 0 would have the same effect for
current ports, because ports where values other than 0 or 16 are
possible all have their own headers).
To avoid changing the existing semantics in any case, including for
compilers not defining __FLT_EVAL_METHOD__, architecture-specific
files are then added for m68k, s390, x86 which replicate the existing
semantics. At least with __FLT_EVAL_METHOD__ values possible with
GCC, there should be no change to the choices of float_t and double_t
for any supported configuration.
Architecture maintainer notes:
* m68k: sysdeps/m68k/m680x0/bits/flt-eval-method.h always defines
__GLIBC_FLT_EVAL_METHOD to 2 to replicate the existing logic. But
actually GCC defines __FLT_EVAL_METHOD__ to 0 if TARGET_68040. It
might make sense to make the header prefer to base things on
__FLT_EVAL_METHOD__ if defined, like the x86 version, and so make
the choices of these types more accurate (with a NEWS entry as for
the other changes to these types on particular architectures).
* s390: sysdeps/s390/bits/flt-eval-method.h always defines
__GLIBC_FLT_EVAL_METHOD to 1 to replicate the existing logic. As
previously discussed, it might make sense in coordination with GCC
to eliminate the historic mistake, avoid excess precision in the
-fexcess-precision=standard case and make the typedefs match (with a
NEWS entry, again).
Tested for x86-64 and x86. Also did compilation-only testing with
build-many-glibcs.py.
* bits/flt-eval-method.h: New file.
* sysdeps/m68k/m680x0/bits/flt-eval-method.h: Likewise.
* sysdeps/s390/bits/flt-eval-method.h: Likewise.
* sysdeps/x86/bits/flt-eval-method.h: Likewise.
* math/Makefile (headers): Add bits/flt-eval-method.h.
* math/math.h: Include <bits/flt-eval-method.h>.
[__USE_ISOC99] (float_t): Define based on __GLIBC_FLT_EVAL_METHOD.
[__USE_ISOC99] (double_t): Likewise.
* bits/mathdef.h (float_t): Remove.
(double_t): Likewise.
* sysdeps/aarch64/bits/mathdef.h (float_t): Likewise.
(double_t): Likewise.
* sysdeps/alpha/bits/mathdef.h (float_t): Likewise.
(double_t): Likewise.
* sysdeps/arm/bits/mathdef.h (float_t): Likewise.
(double_t): Likewise.
* sysdeps/hppa/fpu/bits/mathdef.h (float_t): Likewise.
(double_t): Likewise.
* sysdeps/ia64/bits/mathdef.h (float_t): Likewise.
(double_t): Likewise.
* sysdeps/m68k/m680x0/bits/mathdef.h (float_t): Likewise.
(double_t): Likewise.
* sysdeps/mips/bits/mathdef.h (float_t): Likewise.
(double_t): Likewise.
* sysdeps/powerpc/bits/mathdef.h (float_t): Likewise.
(double_t): Likewise.
* sysdeps/s390/bits/mathdef.h (float_t): Likewise.
(double_t): Likewise.
* sysdeps/sh/sh4/bits/mathdef.h (float_t): Likewise.
(double_t): Likewise.
* sysdeps/sparc/bits/mathdef.h (float_t): Likewise.
(double_t): Likewise.
* sysdeps/tile/bits/mathdef.h (float_t): Likewise.
(double_t): Likewise.
* sysdeps/x86/bits/mathdef.h (float_t): Likewise.
(double_t): Likewise.
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ISO C requires that the value of FP_ILOGB0 must be INT_MIN or
-INT_MAX. In sysdeps/sh/sh4/bits/mathdef.h, it's 0x80000001; that is,
a positive unsigned value that would be -INT_MAX if converted to int,
which is not valid (there's no actual constraint on the type, but
whatever the type the integer value must be one of the two permitted,
and types other than int don't really make sense). This patch makes
the ABI-compatible change to (-0x7fffffff).
(The testcase handles positive and negative sign separately to avoid
any issues with implicit conversions that could result in e.g. INT_MIN
converted to uintmax_t wrongly passing.)
Tested (compilation only) with build-many-glibcs.py.
[BZ #20859]
* sysdeps/sh/sh4/bits/mathdef.h (FP_ILOGB0): Define to
(-0x7fffffff) instead of 0x80000001.
* math/test-fp-ilogb-constants.c: New file.
* math/Makefile (tests): Add test-fp-ilogb-constants.
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The default (top-level) version of bits/mathdef.h defines float_t to
double. It is used on ColdFire, MicroBlaze, Nios II and SH3, all of
which define FLT_EVAL_METHOD to 0, so float_t should be float (and C11
requires a certain correspondence between these typedefs and
FLT_EVAL_METHOD values).
I proposed fixing this default in
<https://sourceware.org/ml/libc-alpha/2015-01/msg00499.html>, with no
objections from architecture maintainers, and this patch makes that
fix. As noted in the NEWS entry added, this might affect the ABIs of
non-glibc libraries (ImageMagick has been mentioned in gcc-patches
discussion of the S/390 case - which is unaffected by this patch), but
as noted in my previous message, affected libraries would have
problems with -mfpmath=sse anyway on 32-bit x86.
A (compilation) testcase is added to verify the required
correspondence of typedefs to FLT_EVAL_METHOD values. This test is
built with -fexcess-precision=standard to avoid any issues with GCC 7
on S/390 providing a more accurate FLT_EVAL_METHOD definition in the
default (no excess precision) mode. (This will also be usable to test
a fix for the recently reported bug about these typedefs on x86_64
-mfpmath=387, as architecture-specific tests can be added that
It is entirely possible that the fixed default makes some
architecture-specific versions of bits/mathdef.h semantically
equivalent to the default version and so no longer required. I don't
intend to investigate that separately from the refactoring I proposed
in <https://sourceware.org/ml/libc-alpha/2016-11/msg00745.html>, which
will create as few header variants as possible for each group of
definitions.
Tested (compilation only) with build-many-glibcs.py.
[BZ #20855]
* bits/mathdef.h (float_t): Define to float.
* math/test-flt-eval-method.c: New file.
* math/Makefile (tests): Add test-flt-eval-method.
(CFLAGS-test-flt-eval-method.c): New variable.
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TS 18661-1 defines functions for manipulating the payloads of NaNs.
This patch implements the setpayload functions for glibc; these set a
number (pointed to by a function argument) to a quiet NaN with the
given payload, or to +0 if the given payload is not valid. The
implementations are structured to allow the substance of the
implementation to be shared with the setpayloadsig functions when
those are added.
The semantics in the TS are not entirely clear in the case where the
payload passed to the function is zero (see discussion on the WG14
reflector last month). This patch implements what seems the most
sensible interpretation, that -0 is never valid to give as the
payload, but +0 is valid in the case where the kind of NaN being
generated has its high mantissa bit set so payload 0 is actually
possible in such a NaN.
Tested for x86_64, x86, mips64 and powerpc.
* math/bits/mathcalls.h [__GLIBC_USE (IEC_60559_BFP_EXT)]
(setpayload): New declaration.
* math/Versions (setpayload): New libm symbol at version
GLIBC_2.25.
(setpayloadf): Likewise.
(setpayloadl): Likewise.
* math/Makefile (libm-calls): Add s_setpayloadF.
* math/libm-test.inc (struct test_Ffp_b1_data): Rename to struct
test_Ff_b1_data.
(RUN_TEST_Ff_b1): New macro.
(RUN_TEST_LOOP_Ff_b1): Likewise.
(canonicalize_test_data): Update type.
(setpayload_test_data): New array.
(setpayload_test): New function.
(main): Call setpayload_test.
* manual/arith.texi (FP Bit Twiddling): Document setpayload,
setpayloadf and setpayloadl.
* manual/libm-err-tab.pl: Update comment on interfaces without
ulps tabulated.
* sysdeps/ieee754/dbl-64/s_setpayload.c: New file.
* sysdeps/ieee754/dbl-64/s_setpayload_main.c: Likewise.
* sysdeps/ieee754/dbl-64/wordsize-64/s_setpayload_main.c:
Likewise.
* sysdeps/ieee754/flt-32/s_setpayloadf.c: Likewise.
* sysdeps/ieee754/flt-32/s_setpayloadf_main.c: Likewise.
* sysdeps/ieee754/ldbl-128/s_setpayloadl.c: Likewise.
* sysdeps/ieee754/ldbl-128/s_setpayloadl_main.c: Likewise.
* sysdeps/ieee754/ldbl-128ibm/s_setpayloadl.c: Likewise.
* sysdeps/ieee754/ldbl-128ibm/s_setpayloadl_main.c: Likewise.
* sysdeps/ieee754/ldbl-96/s_setpayloadl.c: Likewise.
* sysdeps/ieee754/ldbl-96/s_setpayloadl_main.c: Likewise.
* sysdeps/ieee754/ldbl-opt/nldbl-setpayload.c: Likewise.
* sysdeps/ieee754/ldbl-opt/Makefile (libnldbl-calls): Add
setpayload.
(CFLAGS-nldbl-setpayload.c): New variable.
* sysdeps/nacl/libm.abilist: Update.
* sysdeps/unix/sysv/linux/aarch64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/alpha/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/arm/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/hppa/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/i386/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/ia64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/m68k/coldfire/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/m68k/m680x0/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/microblaze/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/mips/mips32/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/mips/mips64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/nios2/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libm.abilist:
Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libm.abilist:
Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/libm-le.abilist:
Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/libm.abilist:
Likewise.
* sysdeps/unix/sysv/linux/s390/s390-32/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/s390/s390-64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/sh/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/sparc/sparc32/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/sparc/sparc64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libm.abilist:
Likewise.
* sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libm.abilist:
Likewise.
* sysdeps/unix/sysv/linux/tile/tilepro/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/x86_64/64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/x86_64/x32/libm.abilist: Likewise.
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This patch refactors some type-generic libm macros, in both math.h and
math_private.h, to be based on a common __MATH_TG macro rather than
all replicating similar logic to choose a function to call based on
the type of the argument.
This should serve to illustrate what I think float128 support for such
macros should look like: common macros such as __MATH_TG may need
different definitions depending on whether float128 is supported in
glibc, so that the individual macros themselves do not need
conditionals on float128 support.
Tested for x86_64, x86, mips64 and powerpc.
* math/math.h (__MATH_TG): New macro.
[__USE_ISOC99] (fpclassify): Define using __MATH_TG.
[__USE_ISOC99] (signbit): Likewise.
[__USE_ISOC99] (isfinite): Likewise.
[__USE_ISOC99] (isnan): Likewise.
[__USE_ISOC99] (isinf): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (issignaling): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (__MATH_EVAL_FMT2): New macro.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (iseqsig): Define using
__MATH_TG and __MATH_EVAL_FMT2.
* sysdeps/generic/math_private.h (fabs_tg): Define using
__MATH_TG.
* sysdeps/ieee754/ldbl-128ibm/bits/iscanonical.h
[!__NO_LONG_DOUBLE_MATH] (__iscanonicalf): New macro.
[!__NO_LONG_DOUBLE_MATH] (__iscanonical): Likewise.
[!__NO_LONG_DOUBLE_MATH] (iscanonical): Define using __MATH_TG.
* sysdeps/ieee754/ldbl-96/bits/iscanonical.h (__iscanonicalf): New
macro.
(__iscanonical): Likewise.
(iscanonical): Define using __MATH_TG.
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* math/test-tgmath2.c: Split up test function.
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TS 18661-1 defines SNAN macros for signaling NaN values, suitable for
use in static initializers. This patch adds them to glibc's <math.h>
(provided you are building with GCC 3.3 or later; no attempt is made
to provide any kind of nonconforming fallback for older compilers
without the __builtin_nans functions).
Tested for x86_64 and x86.
* math/math.h
[__GLIBC_USE (IEC_60559_BFP_EXT) && __GNUC_PREREQ (3, 3)] (SNANF):
New macro.
[__GLIBC_USE (IEC_60559_BFP_EXT) && __GNUC_PREREQ (3, 3)] (SNAN):
Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT) && __GNUC_PREREQ (3, 3)] (SNANL):
Likewise.
* manual/arith.texi (Infinity and NaN): Document SNANF, SNAN and
SNANL.
* math/test-double.h (snan_value_MACRO): New macro.
* math/test-float.h (snan_value_MACRO): Likewise.
* math/test-ldouble.h (snan_value_MACRO): Likewise.
* math/libm-test.inc (issignaling_test_data): Add tests of
snan_value_MACRO.
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The test math/test-nan-overflow uses malloc without including
stdlib.h. On -Os builds for i486 the header inclusion order
is altered enough that the test fails to build because of the
warning which is turned into an error.
The obvious fix is to include stdlib.h since malloc is being
used directly.
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TS 18661-1 defines canonicalize functions to produce a canonical
version of a floating-point representation. This patch implements
these functions for glibc.
As with the iscanonical macro, these functions are oriented to the
decimal floating-point case, where some values have both canonical and
noncanonical representations. However, the functions have a return
value that says whether they succeeded in storing a canonical result;
thus, they can fail for the case of an invalid representation (while
still not making any particular choice from among multiple equally
canonical valid representations of the same value). Since no
floating-point formats in glibc actually have noncanonical valid
representations, a type-generic implementation of these functions can
be used that expects iscanonical to return 0 only for invalid
representations. Now that iscanonical is used within libm.so,
libm_hidden_proto / libm_hidden_def are added for __iscanonicall.
The definition of these functions is intended to correspond to a
convertFormat operation to the same floating-point format. Thus, they
convert signaling NaNs to quiet NaNs, raising the "invalid" exception.
Such a conversion "should" produce "the canonical version of that
signaling NaN made quiet".
libm-test.inc is made to check NaN payloads for the output of these
functions, a new feature (at some point manipulation functions such as
fabs and copysign should have tests added that verify payload
preservation for them). As however some architectures may not follow
the recommended practice of preserving NaN payloads when converting a
signaling NaN to quiet, a new math-tests.h macro
SNAN_TESTS_PRESERVE_PAYLOAD is added, and defined to 0 for non-NAN2008
MIPS; any other architectures seeing test failures for lack of payload
preservation in this case should also define this macro to 0. (If any
cases arise where the sign isn't preserved either, those should have a
similar macro added.)
The ldbl-96 and ldbl-128ibm tests of iscanonical are renamed and
adapted to test canonicalizel as well on the same representations.
Tested for x86_64, x86, mips64 and powerpc.
* math/bits/mathcalls.h [__GLIBC_USE (IEC_60559_BFP_EXT)]
(canonicalize): New declaration.
* math/Versions (canonicalize): New libm symbol at version
GLIBC_2.25.
(canonicalizef): Likewise.
(canonicalizel): Likewise.
* math/Makefile (gen-libm-calls): Add s_canonicalizeF.
* math/s_canonicalize_template.c: New file.
* math/libm-test.inc: Update comment on functions tested and
testing of NaN payloads.
(TEST_NAN_PAYLOAD): New macro.
(NO_TEST_INLINE): Update value.
(XFAIL_TEST): Likewise.
(ERRNO_UNCHANGED): Likewise.
(ERRNO_EDOM): Likewise.
(ERRNO_ERANGE): Likewise.
(IGNORE_RESULT): Likewise.
(NON_FINITE): Likewise.
(TEST_SNAN): Likewise.
(NO_TEST_MATHVEC): Likewise.
(TEST_NAN_PAYLOAD_CANONICALIZE): New macro.
(check_float_internal): Check NaN payloads if TEST_NAN_PAYLOAD.
(struct test_Ffp_b1_data): New type.
(RUN_TEST_Ffp_b1): New macro.
(RUN_TEST_LOOP_Ffp_b1): Likewise.
(canonicalize_test_data): New array.
(canonicalize_test): New function.
(main): Call canonicalize_test.
* manual/arith.texi (FP Bit Twiddling): Document canonicalize,
canonicalizef and canonicalizel.
* manual/libm-err-tab.pl: Update comment on interfaces without
ulps tabulated.
* sysdeps/ieee754/ldbl-opt/nldbl-canonicalize.c: New file.
* sysdeps/ieee754/ldbl-opt/s_canonicalizel.c: Likewise.
* sysdeps/ieee754/ldbl-opt/Makefile (libnldbl-calls): Add
canonicalize.
(CFLAGS-nldbl-canonicalize.c): New variable.
* sysdeps/ieee754/ldbl-128ibm/test-iscanonical-ldbl-128ibm.c: Move
to ...
* sysdeps/ieee754/ldbl-128ibm/test-canonical-ldbl-128ibm.c:
... here.
(do_test): Also test canonicalizel.
* sysdeps/ieee754/ldbl-128ibm/Makefile (tests): Change
test-iscanonical-ldbl-128ibm to test-canonical-ldbl-128ibm.
* sysdeps/ieee754/ldbl-128ibm/include/bits/iscanonical.h: New
file.
* sysdeps/ieee754/ldbl-128ibm/s_iscanonicall.c (__iscanonicall):
Use libm_hidden_def.
* sysdeps/ieee754/ldbl-96/test-iscanonical-ldbl-96.c: Move to ...
* sysdeps/ieee754/ldbl-96/test-canonical-ldbl-96.c: ... here.
(do_test): Also test canonicalizel.
* sysdeps/ieee754/ldbl-96/Makefile (tests): Change
test-iscanonical-ldbl-96 to test-canonical-ldbl-96.
* sysdeps/ieee754/ldbl-96/include/bits/iscanonical.h: New file.
* sysdeps/ieee754/ldbl-96/s_iscanonicall.c (__iscanonicall): Use
libm_hidden_def.
* sysdeps/generic/math-tests.h (SNAN_TESTS_PRESERVE_PAYLOAD): New
macro.
* sysdeps/mips/math-tests.h [__mips_hard_float && !__mips_nan2008]
(SNAN_TESTS_PRESERVE_PAYLOAD): Likewise.
* sysdeps/nacl/libm.abilist: Update.
* sysdeps/unix/sysv/linux/aarch64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/alpha/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/arm/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/hppa/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/i386/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/ia64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/m68k/coldfire/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/m68k/m680x0/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/microblaze/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/mips/mips32/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/mips/mips64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/nios2/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libm.abilist:
Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libm.abilist:
Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/libm-le.abilist:
Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/libm.abilist:
Likewise.
* sysdeps/unix/sysv/linux/s390/s390-32/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/s390/s390-64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/sh/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/sparc/sparc32/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/sparc/sparc64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libm.abilist:
Likewise.
* sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libm.abilist:
Likewise.
* sysdeps/unix/sysv/linux/tile/tilepro/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/x86_64/64/libm.abilist: Likewise.
* sysdeps/unix/sysv/linux/x86_64/x32/libm.abilist: Likewise.
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It is still common to include system header files in an extern "C"
block. This means that exiting <math.h>'s own extern "C" block
is not sufficient to get back to C++ mode. Use an extern "C++"
wrapper instead.
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This increases compatibility with C++ code which is forced to
compile with _GNU_SOURCE.
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