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* soft-fp: Add brain format supportJakub Jelinek2024-02-0112-0/+738
| | | | | | | | In https://gcc.gnu.org/r13-3292 I've added brain format support (std::bfloat16_t) on the GCC side, but as glibc has the master copy of soft-fp, the following patch adds the files from that commit and from https://gcc.gnu.org/r13-6598 and https://gcc.gnu.org/r13-6622 The files are not used by glibc right now.
* Update copyright dates with scripts/update-copyrightsPaul Eggert2024-01-01104-104/+104
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* Update copyright dates with scripts/update-copyrightsJoseph Myers2023-01-06104-104/+104
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* soft-fp: Add fixhf[uns][di|si] and float[uns][di|si]hfKito Cheng2022-08-088-0/+360
| | | | | | | | | Add more IEEE half conversion routines: - Convert 32-bit/64-bit integer to IEEE half. - Convert IEEE half to 32-bit/64-bit integer. They are required by RISC-V _Float16 support, tested with RISC-V GCC.
* Update copyright dates with scripts/update-copyrightsPaul Eggert2022-01-0196-96/+96
| | | | | | | | | | | | | | | | | | | | | | | I used these shell commands: ../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright (cd ../glibc && git commit -am"[this commit message]") and then ignored the output, which consisted lines saying "FOO: warning: copyright statement not found" for each of 7061 files FOO. I then removed trailing white space from math/tgmath.h, support/tst-support-open-dev-null-range.c, and sysdeps/x86_64/multiarch/strlen-vec.S, to work around the following obscure pre-commit check failure diagnostics from Savannah. I don't know why I run into these diagnostics whereas others evidently do not. remote: *** 912-#endif remote: *** 913: remote: *** 914- remote: *** error: lines with trailing whitespace found ... remote: *** error: sysdeps/unix/sysv/linux/statx_cp.c: trailing lines
* Remove "Contributed by" linesSiddhesh Poyarekar2021-09-0381-161/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | We stopped adding "Contributed by" or similar lines in sources in 2012 in favour of git logs and keeping the Contributors section of the glibc manual up to date. Removing these lines makes the license header a bit more consistent across files and also removes the possibility of error in attribution when license blocks or files are copied across since the contributed-by lines don't actually reflect reality in those cases. Move all "Contributed by" and similar lines (Written by, Test by, etc.) into a new file CONTRIBUTED-BY to retain record of these contributions. These contributors are also mentioned in manual/contrib.texi, so we just maintain this additional record as a courtesy to the earlier developers. The following scripts were used to filter a list of files to edit in place and to clean up the CONTRIBUTED-BY file respectively. These were not added to the glibc sources because they're not expected to be of any use in future given that this is a one time task: https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02 Reviewed-by: Carlos O'Donell <carlos@redhat.com>
* soft-fp: Add __extendhfsf2/__extendhfdf2, __truncsfhf2/__truncdfhf2, ↵liuhongt2021-07-076-0/+253
| | | | | | | | | | | | | | __eqhf2/__nehf2 1. Add __extendhfdf2/__extendhfsf2 to return an IEEE half converted to IEEE double/single. 2. Add __truncdfhf2/__extendsfhf2 to truncate IEEE double/single into IEEE half. 3. Add __eqhf2/__nehf2 to return 0 if a == b and a,b are not NAN, otherwise return 1. These are needed by x86 _Float16: https://software.intel.com/content/www/us/en/develop/download/intel-avx512-fp16-architecture-specification.html support in GCC.
* soft-fp: Add __extendhfxf2 and __truncxfhf2H.J. Lu2021-07-012-0/+105
| | | | | | | | | | | 1. Add __extendhfxf2 to return an IEEE half converted to IEEE extended. 2. Add __truncxfhf2 to truncate IEEE extended into IEEE half. These are needed by x86 _Float16: https://software.intel.com/content/www/us/en/develop/download/intel-avx512-fp16-architecture-specification.html support in GCC.
* Update copyright dates with scripts/update-copyrightsPaul Eggert2021-01-0289-89/+89
| | | | | | | | | | | | | | | | I used these shell commands: ../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright (cd ../glibc && git commit -am"[this commit message]") and then ignored the output, which consisted lines saying "FOO: warning: copyright statement not found" for each of 6694 files FOO. I then removed trailing white space from benchtests/bench-pthread-locks.c and iconvdata/tst-iconv-big5-hkscs-to-2ucs4.c, to work around this diagnostic from Savannah: remote: *** pre-commit check failed ... remote: *** error: lines with trailing whitespace found remote: error: hook declined to update refs/heads/master
* Update copyright dates with scripts/update-copyrights.Joseph Myers2020-01-0189-89/+89
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* Prefer https to http for gnu.org and fsf.org URLsPaul Eggert2019-09-0789-89/+89
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Also, change sources.redhat.com to sourceware.org. This patch was automatically generated by running the following shell script, which uses GNU sed, and which avoids modifying files imported from upstream: sed -ri ' s,(http|ftp)(://(.*\.)?(gnu|fsf|sourceware)\.org($|[^.]|\.[^a-z])),https\2,g s,(http|ftp)(://(.*\.)?)sources\.redhat\.com($|[^.]|\.[^a-z]),https\2sourceware.org\4,g ' \ $(find $(git ls-files) -prune -type f \ ! -name '*.po' \ ! -name 'ChangeLog*' \ ! -path COPYING ! -path COPYING.LIB \ ! -path manual/fdl-1.3.texi ! -path manual/lgpl-2.1.texi \ ! -path manual/texinfo.tex ! -path scripts/config.guess \ ! -path scripts/config.sub ! -path scripts/install-sh \ ! -path scripts/mkinstalldirs ! -path scripts/move-if-change \ ! -path INSTALL ! -path locale/programs/charmap-kw.h \ ! -path po/libc.pot ! -path sysdeps/gnu/errlist.c \ ! '(' -name configure \ -execdir test -f configure.ac -o -f configure.in ';' ')' \ ! '(' -name preconfigure \ -execdir test -f preconfigure.ac ';' ')' \ -print) and then by running 'make dist-prepare' to regenerate files built from the altered files, and then executing the following to cleanup: chmod a+x sysdeps/unix/sysv/linux/riscv/configure # Omit irrelevant whitespace and comment-only changes, # perhaps from a slightly-different Autoconf version. git checkout -f \ sysdeps/csky/configure \ sysdeps/hppa/configure \ sysdeps/riscv/configure \ sysdeps/unix/sysv/linux/csky/configure # Omit changes that caused a pre-commit check to fail like this: # remote: *** error: sysdeps/powerpc/powerpc64/ppc-mcount.S: trailing lines git checkout -f \ sysdeps/powerpc/powerpc64/ppc-mcount.S \ sysdeps/unix/sysv/linux/s390/s390-64/syscall.S # Omit change that caused a pre-commit check to fail like this: # remote: *** error: sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S: last line does not end in newline git checkout -f sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
* Correct the spelling of more contributorsPaul Eggert2019-08-2914-14/+14
| | | | | Correct the spellings of Rafael Ávila de Espíndola, Uroš Bizjak, Alexandra Hájková, and Rafał Lużyński.
* soft-fp: Properly check _FP_W_TYPE_SIZE [BZ #24066]H.J. Lu2019-01-078-8/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | quad.h have #if _FP_W_TYPE_SIZE < 64 union _FP_UNION_Q { Use 4 _FP_W_TYPEs } #else union _FP_UNION_Q { Use 2 _FP_W_TYPEs } #endif Replace #if (2 * _FP_W_TYPE_SIZE) < _FP_FRACBITS_Q with #if _FP_W_TYPE_SIZE < 64 to check whether 4 or 2 _FP_W_TYPEs are used for IEEE quad precision. Tested with build-many-glibcs.py. [BZ #24066] * soft-fp/extenddftf2.c: Use "_FP_W_TYPE_SIZE < 64" to check if 4_FP_W_TYPEs are used for IEEE quad precision. * soft-fp/extendhftf2.c: Likewise. * soft-fp/extendsftf2.c: Likewise. * soft-fp/extendxftf2.c: Likewise. * soft-fp/trunctfdf2.c: Likewise. * soft-fp/trunctfhf2.c: Likewise. * soft-fp/trunctfsf2.c: Likewise. * soft-fp/trunctfxf2.c: Likewise. * sysdeps/alpha/ots_cvttx.c: Likewise. * sysdeps/alpha/ots_cvtxt.c: Likewise. * sysdeps/ieee754/soft-fp/s_daddl.c: Likewise. * sysdeps/ieee754/soft-fp/s_ddivl.c: Likewise. * sysdeps/ieee754/soft-fp/s_dmull.c: Likewise. * sysdeps/ieee754/soft-fp/s_dsubl.c: Likewise. * sysdeps/ieee754/soft-fp/s_faddl.c: Likewise. * sysdeps/ieee754/soft-fp/s_fdivl.c: Likewise. * sysdeps/ieee754/soft-fp/s_fmull.c: Likewise. * sysdeps/ieee754/soft-fp/s_fsubl.c: Likewise. * sysdeps/sparc/sparc32/q_dtoq.c: Likewise. * sysdeps/sparc/sparc32/q_qtod.c: Likewise. * sysdeps/sparc/sparc32/q_qtos.c: Likewise. * sysdeps/sparc/sparc32/q_stoq.c: Likewise. * sysdeps/sparc/sparc64/qp_dtoq.c: Likewise. * sysdeps/sparc/sparc64/qp_qtod.c: Likewise. * sysdeps/sparc/sparc64/qp_qtos.c: Likewise. * sysdeps/sparc/sparc64/qp_stoq.c: Likewise.
* Update copyright dates with scripts/update-copyrights.Joseph Myers2019-01-0189-89/+89
| | | | | | | * All files with FSF copyright notices: Update copyright dates using scripts/update-copyrights. * locale/programs/charmap-kw.h: Regenerated. * locale/programs/locfile-kw.h: Likewise.
* soft-fp: Add implementation for 128 bit self-containedZong Li2018-11-011-0/+88
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Here only add the implementation when building the RV32 port. These macros are used when the following situations occur at the same time: soft-fp fma, ldbl-128 and 32-bit _FP_W_TYPE_SIZE. The RISC-V 32-bit port is the first port which use all three together. This is the building flow about the situation: When building soft-fp/s_fmal.c, there uses the FP_FMA_Q in __fmal. The _FP_W_TYPE_SIZE is defined to 32-bit in sysdeps/riscv/sfp-machine.h, so the FP_FMA_Q was defined to _FP_FMA (Q, 4, 8, R, X, Y, Z) in soft-fp/quad.h. Something in the soft-fp/quad.h: #if _FP_W_TYPE_SIZE < 64 # define FP_FMA_Q(R, X, Y, Z) _FP_FMA (Q, 4, 8, R, X, Y, Z) #else # define FP_FMA_Q(R, X, Y, Z) _FP_FMA (Q, 2, 4, R, X, Y, Z) #endif Finally, in _FP_FMA (fs, wc, dwc, R, X, Y, Z), it will use the _FP_FRAC_HIGHBIT_DW_##dwc macro, and it will be expanded to _FP_FRAC_HIGHBIT_DW_8, but the _FP_FRAC_HIGHBIT_DW_8 is not be implemented in soft-fp/op-8.h. there is only _FP_FRAC_HIGHBIT_DW_1, _FP_FRAC_HIGHBIT_DW_2 and _FP_FRAC_HIGHBIT_DW_4 in the soft-fp/op-*.h. After this modification, we can pass the soft floating testing of glibc testsuites on RV32. * soft-fp/op-8.h (_FP_FRAC_SET_8, _FP_FRAC_ADD_8, _FP_FRAC_SUB_8) (_FP_FRAC_CLZ_8, _FP_MINFRAC_8, _FP_FRAC_NEGP_8, _FP_FRAC_ZEROP_8) (_FP_FRAC_HIGHBIT_DW_8, _FP_FRAC_COPY_4_8, _FP_FRAC_COPY_8_4) (__FP_FRAC_SET_8): Add implementation for RV32 use.
* soft-fp: Use temporary variable in FP_FRAC_SUB_3/FP_FRAC_SUB_4Zong Li2018-11-011-28/+35
| | | | | | | | | | | | | | | | | | | | | | | | | In FRAC_SUB_3(R, X, Y) and FRAC_SUB_4(R,, X, Y), it reference both the X[N] and X[N] after R[N] have been set. If one of the X and Y is the same address with R, the result of the calculation is wrong, because the value of the original X and Y are overwritten. In glibc, there are two places use FRAC_SUB and occurs the overlap. The first is _FP_DIV_MEAT_N_loop in op-common.h, it uses the source _FP_DIV_MEAT_N_loop_u as the destination. This macro only be used when N is one(_FP_DIV_MEAT_1_loop) and then the _FP_FRAC_SUB_##wc extend to _FP_FRAC_SUB_1 in this macro. so it also work because _FP_FRAC_SUB_1 has no overlap problem in its implementation. The second places is _FP_DIV_MEAT_4_udiv, the original value of X##_f[0] is overwritten before the calculatation. In FRAC_SUB_1 and FRAC_SUB_2, there don't refer the source after destination have been set, so they have no problem. After this modification, we can pass the soft floating testing of glibc testsuites on RV32. * soft-fp/op-4.h (_FP_FRAC_SUB_3, _FP_FRAC_SUB_4): Use temporary variable to avoid overlap arguments.
* Make powerpc-nofpu __sqrtsf2, __sqrtdf2 compat symbols (bug 18473).Joseph Myers2018-06-014-150/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | powerpc-nofpu libc exports __sqrtsf2 and __sqrtdf2 symbols. The export of these soft-fp symbols is a mistake; they aren't part of the libgcc interface and GCC will never generate code that calls them. This patch makes them into compat symbols (no code built for static libc), moving their sources from the generic soft-fp sources to sysdeps/powerpc/nofpu (the underlying soft-fp FP_SQRT functionality remains of use to implement actual sqrt public interfaces, such as sqrtl / sqrtf128 for which it is used on various platforms, but __sqrt[sdt]f2 are not such interfaces). Tested with build-many-glibcs.py for relevant platforms. [BZ #18473] * soft-fp/sqrttf2.c: Remove file. * soft-fp/sqrtdf2.c: Move to .... * sysdeps/powerpc/nofpu/sqrtdf2.c: ... here. Include <shlib-compat.h>. (__sqrtdf2): Make conditional on [SHLIB_COMPAT (libc, GLIBC_2_3_2, GLIBC_2_28)]. Define as compat symbol. * soft-fp/sqrtsf2.c: Move to .... * sysdeps/powerpc/nofpu/sqrtsf2.c: ... here. Include <shlib-compat.h>. (__sqrtsf2): Make conditional on [SHLIB_COMPAT (libc, GLIBC_2_3_2, GLIBC_2_28)]. Define as compat symbol. * soft-fp/Makefile (gcc-single-routines): Remove sqrtsf2. (gcc-double-routines): Remove sqrtdf2. (gcc-quad-routines): Remove sqrttf2. * sysdeps/nios2/Makefile [$(subdir) = soft-fp] (sysdep_routines): Do not filter out sqrtsf2 and sqrtdf2. * sysdeps/powerpc/nofpu/Makefile [$(subdir) = soft-fp] (sysdep_routines): Add sqrtsf2 and sqrtdf2.
* Add narrowing multiply functions.Joseph Myers2018-05-161-0/+21
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch adds the narrowing multiply functions from TS 18661-1 to glibc's libm: fmul, fmull, dmull, f32mulf64, f32mulf32x, f32xmulf64 for all configurations; f32mulf64x, f32mulf128, f64mulf64x, f64mulf128, f32xmulf64x, f32xmulf128, f64xmulf128 for configurations with _Float64x and _Float128; __nldbl_dmull for ldbl-opt. The changes are mostly essentially the same as for the narrowing add functions, so the description of those generally applies to this patch as well. f32xmulf64 for i386 cannot use precision control as used for add and subtract, because that would result in double rounding for subnormal results, so that uses round-to-odd with long double intermediate result instead. The soft-fp support involves adding a new FP_TRUNC_COOKED since soft-fp multiplication uses cooked inputs and outputs. Tested for x86_64, x86, mips64 (all three ABIs, both hard and soft float) and powerpc, and with build-many-glibcs.py. * math/Makefile (libm-narrow-fns): Add mul. (libm-test-funcs-narrow): Likewise. * math/Versions (GLIBC_2.28): Add narrowing multiply functions. * math/bits/mathcalls-narrow.h (mul): Use __MATHCALL_NARROW. * math/gen-auto-libm-tests.c (test_functions): Add mul. * math/math-narrow.h (CHECK_NARROW_MUL): New macro. (NARROW_MUL_ROUND_TO_ODD): Likewise. (NARROW_MUL_TRIVIAL): Likewise. * soft-fp/op-common.h (FP_TRUNC_COOKED): Likewise. * sysdeps/ieee754/float128/float128_private.h (__fmull): New macro. (__dmull): Likewise. * sysdeps/ieee754/ldbl-opt/Makefile (libnldbl-calls): Add fmul and dmul. (CFLAGS-nldbl-dmul.c): New variable. (CFLAGS-nldbl-fmul.c): Likewise. * sysdeps/ieee754/ldbl-opt/Versions (GLIBC_2.28): Add __nldbl_dmull. * sysdeps/ieee754/ldbl-opt/nldbl-compat.h (__nldbl_dmull): New prototype. * manual/arith.texi (Misc FP Arithmetic): Document fmul, fmull, dmull, fMmulfN, fMmulfNx, fMxmulfN and fMxmulfNx. * math/auto-libm-test-in: Add tests of mul. * math/auto-libm-test-out-narrow-mul: New generated file. * math/libm-test-narrow-mul.inc: New file. * sysdeps/i386/fpu/s_f32xmulf64.c: Likewise. * sysdeps/ieee754/dbl-64/s_f32xmulf64.c: Likewise. * sysdeps/ieee754/dbl-64/s_fmul.c: Likewise. * sysdeps/ieee754/float128/s_f32mulf128.c: Likewise. * sysdeps/ieee754/float128/s_f64mulf128.c: Likewise. * sysdeps/ieee754/float128/s_f64xmulf128.c: Likewise. * sysdeps/ieee754/ldbl-128/s_dmull.c: Likewise. * sysdeps/ieee754/ldbl-128/s_f64xmulf128.c: Likewise. * sysdeps/ieee754/ldbl-128/s_fmull.c: Likewise. * sysdeps/ieee754/ldbl-128ibm/s_dmull.c: Likewise. * sysdeps/ieee754/ldbl-128ibm/s_fmull.c: Likewise. * sysdeps/ieee754/ldbl-96/s_dmull.c: Likewise. * sysdeps/ieee754/ldbl-96/s_fmull.c: Likewise. * sysdeps/ieee754/ldbl-opt/nldbl-dmul.c: Likewise. * sysdeps/ieee754/ldbl-opt/nldbl-fmul.c: Likewise. * sysdeps/ieee754/soft-fp/s_dmull.c: Likewise. * sysdeps/ieee754/soft-fp/s_fmul.c: Likewise. * sysdeps/ieee754/soft-fp/s_fmull.c: Likewise. * sysdeps/powerpc/fpu/libm-test-ulps: Update. * sysdeps/mach/hurd/i386/libm.abilist: Likewise. * 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/riscv/rv64/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/x86_64/64/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/x86_64/x32/libm.abilist: Likewise.
* Do not use packed structures in soft-fp.Joseph Myers2018-02-015-6/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Building for soft-float ColdFire produces an error in soft-fp: In file included from ../sysdeps/ieee754/soft-fp/s_fmaf.c:42: ../soft-fp/single.h:85:3: error: 'packed' attribute ignored for field of type 'struct <anonymous>' [-Werror=attributes] } bits __attribute__ ((packed)); ^ While this error only appears in that particular case, this attribute is in fact never useful, on any architecture. If you have struct __attribute__ ((packed)) { ... } bits; or struct { ... } __attribute__ ((packed)) bits; then the attribute affects the layout of the structure type. But with the form used in this code struct { ... } bits __attribute__ ((packed)); the field bits is being declared packed, but the layout of its type has already been determined at that point. If on any platform the layout of the sequence of bit-fields were wrong without the use of a packed attribute, the attribute would need to be used via a definition of _FP_STRUCT_LAYOUT, not in its present position. So this patch removes the useless attribute to fix the build for ColdFire soft-float. Tested with build-many-glibcs.py that installed stripped shared libraries are unchanged by the patch. * soft-fp/double.h (union _FP_UNION_D): Do not use attribute packed on bits. * soft-fp/extended.h (union _FP_UNION_E): Likewise. * soft-fp/half.h (union _FP_UNION_H): Likewise. * soft-fp/quad.h (union _FP_UNION_Q): Likewise. * soft-fp/single.h (union _FP_UNION_S): Likewise.
* Update copyright dates with scripts/update-copyrights.Joseph Myers2018-01-0192-92/+92
| | | | | | | * All files with FSF copyright notices: Update copyright dates using scripts/update-copyrights. * locale/programs/charmap-kw.h: Regenerated. * locale/programs/locfile-kw.h: Likewise.
* Add sysdeps/ieee754/soft-fp.Joseph Myers2017-12-123-202/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The default sysdeps/ieee754 fma implementations rely on exceptions and rounding modes to achieve correct results through internal use of round-to-odd. Thus, glibc configurations without support for exceptions and rounding modes instead need to use implementations of fma based on soft-fp. At present, this is achieved via having implementation files in soft-fp/ that are #included by sysdeps files for each glibc configuration that needs them. In general this means such a configuration has its own s_fma.c and s_fmaf.c. TS 18661-1 adds functions that do an operation (+ - * / sqrt fma) on arguments wider than the return type, with a single rounding of the infinite-precision result to that return type. These are also naturally implemented using round-to-odd on platforms with hardware support for rounding modes and exceptions but lacking hardware support for these narrowing operations themselves. (Platforms that have direct hardware support for such narrowing operations include at least ia64, and Power ISA 2.07 or later, which I think means POWER8 or later.) So adding the remaining TS 18661-1 functions would mean at least six narrowing function implementations (fadd fsub fmul fdiv ffma fsqrt), with aliases for other types and further implementations in some configurations, that need to be overridden for configurations lacking hardware exceptions and rounding modes. Requiring all such configurations (currently seven of them) to have their own source files for all those functions seems undesirable. Thus, this patch adds a directory sysdeps/ieee754/soft-fp to contain libm function implementations based on soft-fp. This directory is then used via Implies from all the configurations that need it, so no more files need adding to every such configuration when adding more functions with soft-fp implementations. A configuration can still selectively #include a particular file from this directory if desired; thus, the MIPS #include of the fmal implementation is retained, since that's appropriate even for hard float (because long double is always implementated in software for MIPS64, so the soft-fp implementation of fmal is better than the ldbl-128 one). This also provides additional motivation for my recent patch removing --with-fp / --without-fp: previously there was no need for correct use of --without-fp for no-FPU ARM or SH3, and now we have autodetection nofpu/ sysdeps directories can be used by this patch for those configurations without imposing any new requirements on how glibc is configured. (The mips64/*/fpu/s_fma.c files added by this patch are needed to keep the dbl-64 version of fma for double, rather than the ldbl-128 one, used in that case.) Tested with build-many-glibcs.py that installed stripped shared libraries are unchanged by this patch. * soft-fp/fmadf4.c: Move to .... * sysdeps/ieee754/soft-fp/s_fma.c: ... here. * soft-fp/fmasf4.c: Move to .... * sysdeps/ieee754/soft-fp/s_fmaf.c: ... here. * soft-fp/fmatf4.c: Move to .... * sysdeps/ieee754/soft-fp/s_fmal.c: ... here. * sysdeps/ieee754/soft-fp/Makefile: New file. * sysdeps/arm/preconfigure.ac: Define with_fp_cond. * sysdeps/arm/preconfigure: Regenerated. * sysdeps/arm/nofpu/Implies: New file. * sysdeps/arm/s_fma.c: Remove file. * sysdeps/arm/s_fmaf.c: Likewise. * sysdeps/m68k/coldfire/nofpu/Implies: New file. * sysdeps/m68k/coldfire/nofpu/s_fma.c: Remove file. * sysdeps/m68k/coldfire/nofpu/s_fmaf.c: Likewise. * sysdeps/microblaze/Implies: Add ieee754/soft-fp. * sysdeps/microblaze/s_fma.c: Remove file. * sysdeps/microblaze/s_fmaf.c: Likewise. * sysdeps/mips/mips32/nofpu/Implies: New file. * sysdeps/mips/mips64/n32/fpu/s_fma.c: Likewise. * sysdeps/mips/mips64/n32/nofpu/Implies: Likewise. * sysdeps/mips/mips64/n64/fpu/s_fma.c: Likewise. * sysdeps/mips/mips64/n64/nofpu/Implies: Likewise. * sysdeps/mips/ieee754/s_fma.c: Remove file. * sysdeps/mips/ieee754/s_fmaf.c: Likewise. * sysdeps/mips/ieee754/s_fmal.c: Update include for move of fmal implementation. * sysdeps/nios2/Implies: Add ieee754/soft-fp. * sysdeps/nios2/s_fma.c: Remove file. * sysdeps/nios2/s_fmaf.c: Likewise. * sysdeps/sh/nofpu/Implies: New file. * sysdeps/sh/s_fma.c: Remove file. * sysdeps/sh/s_fmaf.c: Likewise. * sysdeps/tile/Implies: Add ieee754/soft-fp. * sysdeps/tile/s_fma.c: Remove file. * sysdeps/tile/s_fmaf.c: Likewise.
* Use libm_alias_* in soft-fp.Joseph Myers2017-10-113-8/+6
| | | | | | | | | | | | | | | This patch makes the soft-fp implementations of fma functions use the libm_alias_* macros. Tested with build-many-glibcs.py that installed stripped shared libraries are unchanged by the patch. * soft-fp/fmadf4.c: Include <libm-alias-double.h>. [!__fma] (fma): Define using libm_alias_double. * soft-fp/fmasf4.c: Include <libm-alias-float.h>. [!__fmaf] (fmaf): Define using libm_alias_float. * soft-fp/fmatf4.c: Include <libm-alias-ldouble.h>. (fmal): Define using libm_alias_ldouble.
* Remove non-add-on Banner files.Joseph Myers2017-09-211-1/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Various subdirectories of glibc include Banner files to put some text in the output of executing libc.so.6, under "Available extensions". Some of those subdirectories (e.g. crypt) may originally have been add-ons (and so optional, so a particular glibc build might or might not have included them), but except for libidn they aren't now (or if only included in some builds, in the case of soft-fp, the inclusion depends on the architecture for which glibc is configured rather than having any glibc configuration for which it's an optional feature), and it doesn't seem useful for the libc.so.6 output to call out a few features like that. This patch removes the non-add-on Banner files, updating contrib.texi where they noted contributions not otherwise mentioned there. Tested for x86_64. * crypt/Banner: Remove file. * nptl/Banner: Likewise. * resolv/Banner: Likewise. * soft-fp/Banner: Likewise. * nptl/Makefile ($(objpfx)banner.h): Remove rule. ($(objpfx)version.d): Remove dependency on banner.h. ($(objpfx)version.os): Likewise. * nptl/version.c (banner): Do not include banner.h. * manual/contrib.texi: Update entries for Richard Henderson, Jakub Jelinek and BIND code.
* Narrowing the visibility of libc-internal.h even further.Zack Weinberg2017-03-013-9/+12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | posix/wordexp-test.c used libc-internal.h for PTR_ALIGN_DOWN; similar to what was done with libc-diag.h, I have split the definitions of cast_to_integer, ALIGN_UP, ALIGN_DOWN, PTR_ALIGN_UP, and PTR_ALIGN_DOWN to a new header, libc-pointer-arith.h. It then occurred to me that the remaining declarations in libc-internal.h are mostly to do with early initialization, and probably most of the files including it, even in the core code, don't need it anymore. Indeed, only 19 files actually need what remains of libc-internal.h. 23 others need libc-diag.h instead, and 12 need libc-pointer-arith.h instead. No file needs more than one of them, and 16 don't need any of them! So, with this patch, libc-internal.h stops including libc-diag.h as well as losing the pointer arithmetic macros, and all including files are adjusted. * include/libc-pointer-arith.h: New file. Define cast_to_integer, ALIGN_UP, ALIGN_DOWN, PTR_ALIGN_UP, and PTR_ALIGN_DOWN here. * include/libc-internal.h: Definitions of above macros moved from here. Don't include libc-diag.h anymore either. * posix/wordexp-test.c: Include stdint.h and libc-pointer-arith.h. Don't include libc-internal.h. * debug/pcprofile.c, elf/dl-tunables.c, elf/soinit.c, io/openat.c * io/openat64.c, misc/ptrace.c, nptl/pthread_clock_gettime.c * nptl/pthread_clock_settime.c, nptl/pthread_cond_common.c * string/strcoll_l.c, sysdeps/nacl/brk.c * sysdeps/unix/clock_settime.c * sysdeps/unix/sysv/linux/i386/get_clockfreq.c * sysdeps/unix/sysv/linux/ia64/get_clockfreq.c * sysdeps/unix/sysv/linux/powerpc/get_clockfreq.c * sysdeps/unix/sysv/linux/sparc/sparc64/get_clockfreq.c: Don't include libc-internal.h. * elf/get-dynamic-info.h, iconv/loop.c * iconvdata/iso-2022-cn-ext.c, locale/weight.h, locale/weightwc.h * misc/reboot.c, nis/nis_table.c, nptl_db/thread_dbP.h * nscd/connections.c, resolv/res_send.c, soft-fp/fmadf4.c * soft-fp/fmasf4.c, soft-fp/fmatf4.c, stdio-common/vfscanf.c * sysdeps/ieee754/dbl-64/e_lgamma_r.c * sysdeps/ieee754/dbl-64/k_rem_pio2.c * sysdeps/ieee754/flt-32/e_lgammaf_r.c * sysdeps/ieee754/flt-32/k_rem_pio2f.c * sysdeps/ieee754/ldbl-128/k_tanl.c * sysdeps/ieee754/ldbl-128ibm/k_tanl.c * sysdeps/ieee754/ldbl-96/e_lgammal_r.c * sysdeps/ieee754/ldbl-96/k_tanl.c, sysdeps/nptl/futex-internal.h: Include libc-diag.h instead of libc-internal.h. * elf/dl-load.c, elf/dl-reloc.c, locale/programs/locarchive.c * nptl/nptl-init.c, string/strcspn.c, string/strspn.c * malloc/malloc.c, sysdeps/i386/nptl/tls.h * sysdeps/nacl/dl-map-segments.h, sysdeps/x86_64/atomic-machine.h * sysdeps/unix/sysv/linux/spawni.c * sysdeps/x86_64/nptl/tls.h: Include libc-pointer-arith.h instead of libc-internal.h. * elf/get-dynamic-info.h, sysdeps/nacl/dl-map-segments.h * sysdeps/x86_64/atomic-machine.h: Add multiple include guard.
* * soft-fp/op-common.h (_FP_MUL, _FP_FMA, _FP_DIV): AddJakub Jelinek2017-01-241-0/+5
| | | | /* FALLTHRU */ comments.
* Update copyright dates with scripts/update-copyrights.Joseph Myers2017-01-0195-95/+95
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* [soft-fp] Add support for various half-precision conversion routines.James Greenhalgh2016-09-217-0/+455
| | | | | | | | | | | | | | | | | | | | | This patch adds conversion routines required for _Float16 support in AArch64. These are one-step conversions to and from TImode and TFmode. We need these on AArch64 regardless of presence of the ARMv8.2-A 16-bit floating-point extensions. In the patch, soft-fp/half.h is derived from soft-fp/single.h . The conversion routines are derivatives of their respective SFmode variants. * soft-fp/extendhftf2.c: New. * soft-fp/fixhfti.c: Likewise. * soft-fp/fixunshfti.c: Likewise. * soft-fp/floattihf.c: Likewise. * soft-fp/floatuntihf.c: Likewise. * soft-fp/half.h: Likewise. * soft-fp/trunctfhf2.c: Likewise.
* Fix soft-fp extended.h unpacking (GCC bug 77265).Joseph Myers2016-08-161-0/+4
| | | | | | | | | | | | | | | | | | | | | | | soft-fp unpacking for x86 "extended" fails to clear the implicit mantissa high bit that is explicit in that format, resulting in problems for operations that expect this bit to be clear in raw unpacked values. Specifically, the code for this format is used only for conversions to and from TFmode (__float128) in libgcc, where this issue results in GCC bug 77265, extension of long double infinity to __float128 wrongly produces a NaN. This patch fixes this by always masking out the implicit bit on unpacking, so that the results of unpacking meet the expectations of the rest of the soft-fp code for a normal IEEE format. Tested for x86_64 in libgcc in conjunction with a GCC testcase for this issue (this code isn't used in glibc, only in libgcc). * soft-fp/extended.h [_FP_W_TYPE_SIZE < 64] (FP_UNPACK_RAW_E): Mask implicit bit out of unpacked value. [_FP_W_TYPE_SIZE < 64] (FP_UNPACK_RAW_EP): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_UNPACK_RAW_E): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_UNPACK_RAW_EP): Likewise.
* Update copyright dates with scripts/update-copyrights.Joseph Myers2016-01-0488-88/+88
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* Remove GCC version conditionals on -Wmaybe-uninitialized pragmas.Joseph Myers2015-10-273-12/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | One common case of __GNUC_PREREQ (4, 7) conditionals is use of diagnostic control pragmas for -Wmaybe-uninitialized, an option introduced in GCC 4.7 where older GCC needed -Wuninitialized to be controlled instead if the warning appeared with older GCC. This patch removes such conditionals. (There remain several older uses of -Wno-uninitialized in makefiles that still need to be converted to diagnostic control pragmas if the issue is still present with current sources and supported GCC versions, and it's likely that in most cases those pragmas also will end up controlling -Wmaybe-uninitialized.) Tested for x86_64 and x86 (testsuite, and that installed stripped shared libraries are unchanged by the patch, except for libresolv since res_send.c contains assertions whose line numbers are changed by the patch). * resolv/res_send.c (send_vc) [__GNUC_PREREQ (4, 7)]: Make code unconditional. * soft-fp/fmadf4.c [__GNUC_PREREQ (4, 7)]: Likewise. [!__GNUC_PREREQ (4, 7)]: Remove conditional code. * soft-fp/fmasf4.c [__GNUC_PREREQ (4, 7)]: Make code unconditional. [!__GNUC_PREREQ (4, 7)]: Remove conditional code. * soft-fp/fmatf4.c [__GNUC_PREREQ (4, 7)]: Make code unconditional. [!__GNUC_PREREQ (4, 7)]: Remove conditional code. * stdlib/setenv.c [((__GNUC__ << 16) + __GNUC_MINOR__) >= ((4 << 16) + 7)]: Make code unconditional. [!(((__GNUC__ << 16) + __GNUC_MINOR__) >= ((4 << 16) + 7))]: Remove conditional code. * sysdeps/ieee754/dbl-64/e_lgamma_r.c (__ieee754_lgamma_r) [__GNUC_PREREQ (4, 7)]: Make code unconditional. (__ieee754_lgamma_r) [!__GNUC_PREREQ (4, 7)]: Remove conditional code. * sysdeps/ieee754/flt-32/e_lgammaf_r.c (__ieee754_lgammaf_r) [__GNUC_PREREQ (4, 7)]: Make code unconditional. (__ieee754_lgammaf_r) [!__GNUC_PREREQ (4, 7)]: Remove conditional code. * sysdeps/ieee754/ldbl-128/k_tanl.c (__kernel_tanl) [__GNUC_PREREQ (4, 7)]: Make code unconditional. (__kernel_tanl) [!__GNUC_PREREQ (4, 7)]: Remove conditional code. * sysdeps/ieee754/ldbl-128ibm/k_tanl.c (__kernel_tanl) [__GNUC_PREREQ (4, 7)]: Make code unconditional. (__kernel_tanl) [!__GNUC_PREREQ (4, 7)]: Remove conditional code. * sysdeps/ieee754/ldbl-96/e_lgammal_r.c (__ieee754_lgammal_r) [__GNUC_PREREQ (4, 7)]: Make code unconditional. (__ieee754_lgammal_r) [!__GNUC_PREREQ (4, 7)]: Remove conditional code. * sysdeps/ieee754/ldbl-96/k_tanl.c (__kernel_tanl) [__GNUC_PREREQ (4, 7)]: Make code unconditional. (__kernel_tanl) [!__GNUC_PREREQ (4, 7)]: Remove conditional code.
* Fix undefined warning messages in GCC 6.Steve Ellcey2015-08-273-33/+45
| | | | | | | | | | | | | GCC 6 puts out warnings in a different location then GCC 5. Move the DIAG macros so that the warnings are supressed for both compilers. ChangeLog: * soft-fp/fmasf4.c: Add include of sys/cdefs.h. Move DIAG_PUSH_NEEDS_COMMENT, DIAG_IGNORE_NEEDS_COMMENT to front of file, move DIAG_POP_NEEDS_COMMENT to end of file. * soft-fp/fmadf4.c: Ditto. * soft-fp/fmatf4.c: Ditto.
* Fix soft-fp fma for -Wuninitialized.Joseph Myers2015-05-223-0/+36
| | | | | | | | | | | | | | | | | | | | | The soft-fp implementations of fma produce -Wuninitialized warnings because, in the cases where the result is not a nonzero finite value, the soft-fp does not set the exponent of the result since the (cooked) packing will do so, but the compiler does not then see that the exponent is always set in packing before it's used if it wasn't set earlier. This patch uses DIAG_* macros to suppress those warnings. Tested for mips64. (In fact this allows the mips64 build to complete with the -Wno-uninitialized removed from math/Makefile, but more cleanups are still needed in the ldbl-128ibm code for uninitialized warnings there.) * soft-fp/fmadf4.c: Include <libc-internal.h>. (__fma): Ignore uninitialized warnings around packing. * soft-fp/fmasf4.c: Include <libc-internal.h>. (__fmaf): Ignore uninitialized warnings around packing. * soft-fp/fmatf4.c: Include <libc-internal.h>. (__fmal): Ignore uninitialized warnings around packing.
* soft-fp: Fix alpha kernel build problemRichard Henderson2015-05-191-3/+2
| | | | * soft-fp/op-common.h (_FP_FROM_INT): Don't write to R.
* soft-fp: Define and use _FP_STATIC_ASSERT.Joseph Myers2015-03-123-32/+51
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch makes soft-fp use static assertions in place of conditional calls to abort, in places where there are checks for conditions (on the types for which a macro is used) that the code is not prepared to handle. The fallback definition of _FP_STATIC_ASSERT (for kernel use only, as only relevant to compilers not supported for building glibc) is as in misc/sys/cdefs.h. This means that soft-fp only ever calls abort for _FP_UNREACHABLE calls in builds with GCC versions before 4.5. Thus, there is no need for an abort declaration or <stdlib.h> include, since the kernel code handles defining abort as a macro itself - and so this avoids any need for an __KERNEL__ condition on the abort declaration to avoid it breaking with the kernel's macro definition. That is, this patch is intended to make glibc's soft-fp code suitable for kernel use with no kernel-local changes to the soft-fp code needed at all. Tested for powerpc-nofpu that installed stripped shared libraries are unchanged by the patch. One explicit <stdlib.h> include had to be added to a file that was relying on the include from soft-fp.h. * soft-fp/soft-fp.h (_FP_STATIC_ASSERT): New macro. [_LIBC]: Do not include <stdlib.h>. [!_LIBC] (abort): Remove declaration. * soft-fp/op-2.h (_FP_MUL_MEAT_2_120_240_double): Use _FP_STATIC_ASSERT instead of conditionally calling abort. * soft-fp/op-common.h (_FP_FROM_INT): Likewise. (_FP_EXTEND_CNAN): Likewise. (FP_TRUNC): Likewise. (__FP_CLZ): Likewise. * sysdeps/powerpc/nofpu/flt-rounds.c: Include <stdlib.h>.
* soft-fp: Add _FP_UNREACHABLE.Joseph Myers2015-03-112-4/+13
| | | | | | | | | | | | | | | | | | | | | | This patch makes soft-fp use a new macro _FP_UNREACHABLE in place of calling abort in unreachable default cases of switch statements. _FP_UNREACHABLE expands to call __builtin_unreachable for GCC 4.5 and later; the fallback to abort is thus only for kernel use. Tested for powerpc-nofpu that installed stripped shared libraries are unchanged by this patch. Also tested with the math/ tests for mips64 (in the case of fma there *was* previously an abort call generated, unlike for the other operations - one switch only deals with a subset of classes for one operand based on what could have been generated in the earlier part of fma, whereas the other switches deal with all combinations of two classes - and this is apparently too complicated for the default case to have been optimized away). * soft-fp/soft-fp.h (_FP_UNREACHABLE): New macro. * soft-fp/op-common.h (_FP_MUL): Use _FP_UNREACHABLE instead of abort. (_FP_FMA): Likewise. (_FP_DIV): Likewise.
* soft-fp: Use multiple-include guards.Joseph Myers2015-03-1010-2/+47
| | | | | | | | | | | | | | | | | | | | | | | This patch makes soft-fp headers consistently use multiple-include guards, something previously done mainly only in the Linux kernel version. The guard macros aren't the same as those used in the Linux kernel, but there seems to be enough variation in such guards in Linux kernel code that hopefully this version will be acceptable there. Tested for powerpc-nofpu that installed stripped shared libraries are unchanged by this patch. * soft-fp/double.h [SOFT_FP_DOUBLE_H]: New multiple-include guard. * soft-fp/extended.h [SOFT_FP_EXTENDED_H]: Likewise. * soft-fp/op-1.h [SOFT_FP_OP_1_H]: Likewise. * soft-fp/op-2.h [SOFT_FP_OP_2_H]: Likewise. * soft-fp/op-4.h [SOFT_FP_OP_4_H]: Likewise. * soft-fp/op-8.h [SOFT_FP_OP_8_H]: Likewise. * soft-fp/op-common.h [SOFT_FP_OP_COMMON_H]: Likewise. * soft-fp/quad.h [SOFT_FP_QUAD_H]: Likewise. * soft-fp/single.h [SOFT_FP_SINGLE_H]: Likewise. * soft-fp/soft-fp.h (SOFT_FP_H): Define to 1 rather than empty. Add comment on closing #endif.
* soft-fp: Support conditional zero-initialization in declarations.Joseph Myers2015-03-074-6/+18
| | | | | | | | | | | | | | | | | | | | | | | In the Linux kernel, some architectures have a single function that uses different kinds of unpacking and packing depending on the instruction being emulated, meaning it is not readily visible to the compiler that variables from _FP_DECL and _FP_FRAC_DECL_* macros are only used in cases where they were initialized. The existing copy of soft-fp in the Linux kernel uses zero-initialization to avoid warnings in this case, so while frowned upon as a warning suppression mechanism in code built for glibc it seems appropriate to have such zero-initialization conditional on __KERNEL__. This patch duly adds it, via a macro _FP_ZERO_INIT that expands to empty for non-kernel compilations. Tested for powerpc-nofpu that installed stripped shared libraries are unchanged by this patch. * soft-fp/soft-fp.h (_FP_ZERO_INIT): New macro. Define depending on [__KERNEL__]. * soft-fp/op-1.h (_FP_FRAC_DECL_1): Use _FP_ZERO_INIT. * soft-fp/op-2.h (_FP_FRAC_DECL_2): Likewise. * soft-fp/op-common.h (_FP_DECL): Likewise.
* Fix /* in comment in previous commit.Joseph Myers2015-03-071-1/+1
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* soft-fp: Condition sfp-machine.h include path on __KERNEL__.Joseph Myers2015-03-071-0/+4
| | | | | | | | | | | | | | | | | My Linux kernel patch to update the kernel to current glibc soft-fp <https://sourceware.org/ml/libc-alpha/2015-02/msg00107.html> still leaves a few small differences between the two copies of soft-fp. I think it's desirable to avoid such differences completely if possible by having one set of sources suitable for use in both places. To that end, this patch introduces a conditional on __KERNEL__ for the path by which sfp-machine.h is included. Tested for powerpc-nofpu that installed stripped shared libraries are unchanged by this patch. * soft-fp/soft-fp.h [!_LIBC && __KERNEL__]: Include <asm/sfp-machine.h> instead of <sfp-machine.h>.
* soft-fp: Adjust call to abort for kernel use.Joseph Myers2015-02-201-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | soft-fp calls abort in various cases that the code doesn't handle, all cases that should never actually occur for any supported choice of types. Calling an abort function is not appropriate for kernel use, so the Linux kernel redefines abort as a macro in various ways in the ports using this code, typically to "return 0" or similar. One use of abort in soft-fp is inside a comma expression and doesn't work with such a macro. This patch changes it to use a statement expression. Tested for powerpc-nofpu that installed shared libraries are unchanged by this patch. (There are two classes of aborts: those to make control flow visible to the compiler, in default cases of switches over _FP_CLS_COMBINE, which could reasonably change to __builtin_unreachable for glibc but would still need to handle pre-4.5 compilers for kernel use, and those intended to detect any use of soft-fp for combinations of types the code doesn't know how to handle, which could reasonably become link failures if the calls should always be optimized away. But those are separate possible future enhancements.) * soft-fp/op-common.h (_FP_FROM_INT): Wrap call to abort in expression inside statement expression.
* soft-fp: Fix _FP_FMA when product is zero and third argument is finite (bug ↵Joseph Myers2015-02-061-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | 17932). soft-fp's _FP_FMA fails to set the result's exponent for cases where the result of the multiplication is 0, yielding incorrect (arbitrary, depending on uninitialized values) results for those cases. This affects libm for architectures using soft-fp to implement fma. This patch adds the exponent setting and tests for this case. Tested for ARM soft-float (which uses soft-fp fma), x86_64 and x86 (to verify not introducing new libm test failures there). (This bug showed up in testing my patch to move the Linux kernel to current soft-fp. math/Makefile has "override CFLAGS += -Wno-uninitialized" which would have stopped compiler warnings from showing up this problem, although I wouldn't be surprised if removing that shows spurious warnings from this code, if the compiler fails to follow that various cases where the exponent is uninitialized don't need it initialized because the class is set to a value meaning the uninitialized exponent isn't used.) [BZ #17932] * soft-fp/op-common.h (_FP_FMA): Set exponent of result in case where multiplication results in zero and third argument is finite and nonzero. * math/auto-libm-test-in: Add more tests of fma. * math/auto-libm-test-out: Regenerated.
* soft-fp: Refine FP_EX_DENORM handling for comparisons.Joseph Myers2015-02-061-4/+45
| | | | | | | | | | | | | | | | | | | | | | In <https://sourceware.org/ml/libc-alpha/2014-09/msg00488.html>, I noted that comparisons in soft-fp did not set FP_EX_DENORM unless denormal operands were flushed to zero. This patch fixes soft-fp to check for denormal operands for comparisons and set that exception whenever FP_EX_DENORM is not zero. In particular, for the one architecture for which the Linux kernel defines FP_EX_DENORM (alpha), this corresponds to the existing logic for comparisons and so allows that logic to be replaced by a simple call to FP_CMP_D when soft-fp is updated in the kernel. Tested for powerpc (e500) that installed stripped shared libraries are unchanged by this patch. * soft-fp/op-common.h (_FP_CMP_CHECK_DENORM): New macro. (_FP_CMP_CHECK_FLUSH_ZERO): Likewise. (_FP_CMP): Use_FP_CMP_CHECK_DENORM and _FP_CMP_CHECK_FLUSH_ZERO. (_FP_CMP_EQ): Likewise. (_FP_CMP_UNORD): Use _FP_CMP_CHECK_DENORM.
* soft-fp: Support floating-point extensions without quieting sNaNs.Joseph Myers2015-02-061-4/+10
| | | | | | | | | | | | | | | | | | | | | | | One special case needed in soft-fp to replace the old version in the Linux kernel is extending from a narrower floating-point format to a wider one without quieting signaling NaNs. (This is for arch/powerpc/math-emu/lfs.c, where previously it used the old FP_CONV which didn't do anything special for NaNs, then handled packing specially for NaNs to avoid quieting at packing time, and discarded the exceptions from unpacking.) This patch accordingly refactors FP_EXTEND, creating a separate _FP_EXTEND_CNAN that offers a choice of how NaNs are handled, with FP_EXTEND reimplemented as a wrapper that provides the common case of the IEEE operation that does quiet signaling NaNs and raise exceptions for them. Tested for powerpc (e500) that installed stripped shared libraries are unchanged by this patch. * soft-fp/op-common.h (FP_EXTEND): Rename to _FP_EXTEND_CNAN with extra argument CHECK_NAN. Redefine as wrapper around _FP_EXTEND_CNAN.
* soft-fp: Use __label__ for all labels within macros.Joseph Myers2015-01-221-0/+5
| | | | | | | | | | | | | | | | | | | soft-fp has various macros containing labels and goto statements. Because label names are function-scoped, this is problematic for using the same macro more than once within a function, which some architectures do in the Linux kernel (the soft-fp version there predates the addition of any of these labels and gotos). This patch fixes this by using __label__ to make the labels local to the block with the __label__ declaration. Tested for powerpc-nofpu that installed stripped shared libraries are unchanged by this patch. * soft-fp/op-common.h (_FP_ADD_INTERNAL): Declare labels with __label__. (_FP_FMA): Likewise. (_FP_TO_INT_ROUND): Likewise. (_FP_FROM_INT): Likewise.
* Update copyright dates with scripts/update-copyrights.Joseph Myers2015-01-0288-88/+88
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* soft-fp: Add _FP_TO_INT_ROUND.Joseph Myers2014-11-045-0/+226
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Continuing the series of patches adding soft-fp features from the kernel version of soft-fp to glibc so that glibc's version is able to replace the old fork of soft-fp in the kernel, this patch adds the last major such feature: _FP_TO_INT_ROUND, converting a floating-point number to an integer with rounding according to the current rounding direction (as opposed to truncating towards zero, which _FP_TO_INT does). The general structure of the implementation follows that of _FP_TO_INT, but of course is more complicated. As with glibc's _FP_TO_INT it works with raw input (the kernel versions of these macros predate the conversion of _FP_TO_INT and many other macros to raw or semi-raw input). I have not tried to work out what bugs there might be in the kernel version that this might fix; it's a from-scratch implementation based on _FP_TO_INT. Tested for powerpc (soft-float) that there is no change to the installed shared libraries; also tested with the libm tests with lrint / lrintf / llrint / llrintf made to use _FP_TO_INT_ROUND, to provide some test of the functionality. As we don't have benchmarks for those functions, I haven't actually included the soft-fp versions of them, although I expect them to be faster than the existing code (given that the existing code involves adding and subtracting numbers such as 0x1p52 to achieve the desired rounding, which is not particularly efficient when the underlying floating point is software floating point). 2014-11-04 Joseph Myers <joseph@codesourcery.com> * soft-fp/op-common.h (_FP_TO_INT_ROUND): New macro. * soft-fp/double.h [_FP_W_TYPE_SIZE < 64] (FP_TO_INT_ROUND_D): New macro. [_FP_W_TYPE_SIZE >= 64] (FP_TO_INT_ROUND_D): Likewise. * soft-fp/extended.h [_FP_W_TYPE_SIZE < 64] (FP_TO_INT_ROUND_E): New macro. [_FP_W_TYPE_SIZE >= 64] (FP_TO_INT_ROUND_E): Likewise. * soft-fp/quad.h [_FP_W_TYPE_SIZE < 64] (FP_TO_INT_ROUND_Q): New macro. [_FP_W_TYPE_SIZE >= 64] (FP_TO_INT_ROUND_Q): Likewise. * soft-fp/single.h (FP_TO_INT_ROUND_S): New macro.
* soft-fp: Use parentheses around macro arguments.Joseph Myers2014-10-098-305/+328
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch cleans up the soft-fp code to use parentheses around macro arguments (where possible; many macro arguments are identifiers used with ## rather than arbitrary expressions, so cannot be put in parentheses). (I'm not aware of any bugs caused by the lack of parentheses, but this is generally good practice. The patch is not exhaustive regarding internal macros where the arguments always come directly from the mantissa of a floating-point number, although probably those should be cleaned up in this regard as well.) Tested for powerpc-nofpu that the installed shared libraries are unchanged by this patch. * soft-fp/double.h [_FP_W_TYPE_SIZE < 64] (FP_UNPACK_RAW_D): Use parentheses around macro arguments. [_FP_W_TYPE_SIZE < 64] (FP_UNPACK_RAW_DP): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_PACK_RAW_D): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_PACK_RAW_DP): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_UNPACK_D): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_UNPACK_DP): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_UNPACK_SEMIRAW_D): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_UNPACK_SEMIRAW_DP): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_PACK_D): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_PACK_DP): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_PACK_SEMIRAW_D): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_PACK_SEMIRAW_DP): Likewise. [_FP_W_TYPE_SIZE < 64] (_FP_SQRT_MEAT_D): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_CMP_D): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_CMP_EQ_D): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_CMP_UNORD_D): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_TO_INT_D): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_FROM_INT_D): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_UNPACK_RAW_D): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_UNPACK_RAW_DP): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_PACK_RAW_D): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_PACK_RAW_DP): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_UNPACK_D): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_UNPACK_DP): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_UNPACK_SEMIRAW_D): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_UNPACK_SEMIRAW_DP): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_PACK_D): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_PACK_DP): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_PACK_SEMIRAW_D): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_PACK_SEMIRAW_DP): Likewise. [_FP_W_TYPE_SIZE >= 64] (_FP_SQRT_MEAT_D): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_CMP_D): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_CMP_EQ_D): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_CMP_UNORD_D): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_TO_INT_D): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_FROM_INT_D): Likewise. * soft-fp/extended.h [_FP_W_TYPE_SIZE < 64] (FP_UNPACK_E): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_UNPACK_EP): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_UNPACK_SEMIRAW_E): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_UNPACK_SEMIRAW_EP): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_PACK_E): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_PACK_EP): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_PACK_SEMIRAW_E): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_PACK_SEMIRAW_EP): Likewise. [_FP_W_TYPE_SIZE < 64] (_FP_SQRT_MEAT_E): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_CMP_E): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_CMP_EQ_E): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_CMP_UNORD_E): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_TO_INT_E): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_FROM_INT_E): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_UNPACK_E): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_UNPACK_EP): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_UNPACK_SEMIRAW_E): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_UNPACK_SEMIRAW_EP): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_PACK_E): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_PACK_EP): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_PACK_SEMIRAW_E): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_PACK_SEMIRAW_EP): Likewise. [_FP_W_TYPE_SIZE >= 64] (_FP_SQRT_MEAT_E): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_CMP_E): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_CMP_EQ_E): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_CMP_UNORD_E): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_TO_INT_E): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_FROM_INT_E): Likewise. * soft-fp/op-1.h (_FP_FRAC_SRST_1): Likewise. (_FP_FRAC_SRS_1): Likewise. (_FP_FRAC_CLZ_1): Likewise. (_FP_MUL_MEAT_1_imm): Likewise. (_FP_MUL_MEAT_1_wide): Likewise. (_FP_MUL_MEAT_1_hard): Likewise. (_FP_SQRT_MEAT_1): Likewise. (_FP_FRAC_ASSEMBLE_1): Likewise. (_FP_FRAC_DISASSEMBLE_1): Likewise. * soft-fp/op-2.h (_FP_FRAC_CLZ_2): Likewise. (__FP_CLZ_2): Likewise. (_FP_MUL_MEAT_2_wide): Likewise. (_FP_MUL_MEAT_2_wide_3mul): Likewise. (_FP_MUL_MEAT_2_gmp): Likewise. (_FP_MUL_MEAT_2_120_240_double): Likewise. (_FP_SQRT_MEAT_2): Likewise. (_FP_FRAC_ASSEMBLE_2): Likewise. (_FP_FRAC_DISASSEMBLE_2): Likewise. * soft-fp/op-4.h (_FP_FRAC_SRS_4): Likewise. (_FP_FRAC_CLZ_4): Likewise. (_FP_MUL_MEAT_4_wide): Likewise. (_FP_MUL_MEAT_4_gmp): Likewise. (_FP_SQRT_MEAT_4): Likewise. (_FP_FRAC_ASSEMBLE_4): Likewise. (_FP_FRAC_DISASSEMBLE_4): Likewise. * soft-fp/op-common.h (_FP_CMP): Likewise. (_FP_CMP_EQ): Likewise. (_FP_CMP_UNORD): Likewise. (_FP_TO_INT): Likewise. (_FP_FROM_INT): Likewise. [!__FP_CLZ] (__FP_CLZ): Likewise. (_FP_DIV_HELP_imm): Likewise. * soft-fp/quad.h [_FP_W_TYPE_SIZE < 64] (FP_UNPACK_RAW_Q): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_UNPACK_RAW_QP): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_PACK_RAW_Q): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_PACK_RAW_QP): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_UNPACK_Q): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_UNPACK_QP): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_UNPACK_SEMIRAW_Q): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_UNPACK_SEMIRAW_QP): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_PACK_Q): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_PACK_QP): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_PACK_SEMIRAW_Q): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_PACK_SEMIRAW_QP): Likewise. [_FP_W_TYPE_SIZE < 64] (_FP_SQRT_MEAT_Q): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_CMP_Q): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_CMP_EQ_Q): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_CMP_UNORD_Q): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_TO_INT_Q): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_FROM_INT_Q): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_UNPACK_RAW_Q): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_UNPACK_RAW_QP): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_PACK_RAW_Q): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_PACK_RAW_QP): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_UNPACK_Q): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_UNPACK_QP): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_UNPACK_SEMIRAW_Q): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_UNPACK_SEMIRAW_QP): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_PACK_Q): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_PACK_QP): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_PACK_SEMIRAW_Q): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_PACK_SEMIRAW_QP): Likewise. [_FP_W_TYPE_SIZE >= 64] (_FP_SQRT_MEAT_Q): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_CMP_Q): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_CMP_EQ_Q): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_CMP_UNORD_Q): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_TO_INT_Q): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_FROM_INT_Q): Likewise. * soft-fp/single.h (FP_UNPACK_RAW_S): Likewise. (FP_UNPACK_RAW_SP): Likewise. (FP_PACK_RAW_S): Likewise. (FP_PACK_RAW_SP): Likewise. (FP_UNPACK_S): Likewise. (FP_UNPACK_SP): Likewise. (FP_UNPACK_SEMIRAW_S): Likewise. (FP_UNPACK_SEMIRAW_SP): Likewise. (FP_PACK_S): Likewise. (FP_PACK_SP): Likewise. (FP_PACK_SEMIRAW_S): Likewise. (FP_PACK_SEMIRAW_SP): Likewise. (_FP_SQRT_MEAT_S): Likewise. (FP_CMP_S): Likewise. (FP_CMP_EQ_S): Likewise. (FP_CMP_UNORD_S): Likewise. (FP_TO_INT_S): Likewise. (FP_FROM_INT_S): Likewise.
* soft-fp: Support rsigned == 2 in _FP_TO_INT.Joseph Myers2014-10-091-7/+38
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | Continuing the addition of soft-fp features in the Linux kernel version, this patch adds _FP_TO_INT support for rsigned == 2 (reduce overflowing results modulo 2^rsize to fit in the destination, used for alpha emulation). The kernel version is buggy; it can left shift by a negative amount when right shifting is required in an overflow case (the kernel version also has other bugs fixed long ago in glibc; at least, spurious exceptions converting to the most negative integer). This version avoids that by handling overflow (other than to 0) for rsigned == 2 along with the normal non-overflow case, which already properly determines the direction in which to shift. Tested for powerpc-nofpu. Some functions get slightly bigger and some get slightly smaller, no doubt as a result of the change to where in the macro "inexact" is raised, but I don't think those changes are significant. Also tested for powerpc-nofpu with the relevant __fix* functions changed to use rsigned == 2 (which is after all just as valid as rsigned == 1 in IEEE terms), including verifying the results and exceptions for various cases of conversions. With these seven patches, the one remaining feature to add for the soft-fp code to have all the features of the kernel version is _FP_TO_INT_ROUND. * soft-fp/op-common.h (_FP_TO_INT): Handle rsigned == 2.
* soft-fp: Support more precise "invalid" exceptions.Joseph Myers2014-10-092-81/+147
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | As previously discussed <https://sourceware.org/ml/libc-alpha/2013-10/msg00345.html>, it would be desirable to be able to use the same version of the soft-fp code in the Linux kernel as well as in glibc and libgcc (instead of an old version in the kernel that's missing ten years of bug fixes, performance improvements and new features), and to that end it is useful to add to glibc's copy features in the kernel's copy, even when they are not directly useful in glibc. To that end, this patch adds one of those features: support for more precise "invalid" exceptions describing the particular kind of invalid operation. These are relevant for powerpc emulation, and are also as described in IEEE 754-2008 as sub-exceptions. The set of sub-exceptions here is the union of those supported on powerpc and those from IEEE 754-2008 (the former adds a distinction between 0/0 and Inf/Inf; the latter adds a distinction between Inf*0 from multiplication and the same from fma). This includes sub-exceptions for sqrt, conversions to integer and comparisons that are not supported in the kernel; I see no obvious reason for these being missing from the kernel support, given that they are supported on powerpc so accurate powerpc emulation should generate them. Tested for powerpc-nofpu that the disassembly of installed shared libraries is unchanged by this patch. * soft-fp/soft-fp.h (FP_EX_INVALID_SNAN): New macro. (FP_EX_INVALID_IMZ): Likewise. (FP_EX_INVALID_IMZ_FMA): Likewise. (FP_EX_INVALID_ISI): Likewise. (FP_EX_INVALID_ZDZ): Likewise. (FP_EX_INVALID_IDI): Likewise. (FP_EX_INVALID_SQRT): Likewise. (FP_EX_INVALID_CVI): Likewise. (FP_EX_INVALID_VC): Likewise. * soft-fp/op-common.h (_FP_UNPACK_CANONICAL): Specify more precise "invalid" exceptions. (_FP_CHECK_SIGNAN_SEMIRAW): Likewise. (_FP_ADD_INTERNAL): Likewise. (_FP_MUL): Likewise. (_FP_FMA): Likewise. (_FP_DIV): Likewise. (_FP_CMP_CHECK_NAN): Likewise. (_FP_SQRT): Likewise. (_FP_TO_INT): Likewise. (FP_EXTEND): Likewise.
* soft-fp: Add FP_DENORM_ZERO.Joseph Myers2014-10-092-1/+38
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Continuing the addition of soft-fp features used in the Linux kernel, this patch adds soft-fp support for FP_DENORM_ZERO (flushing input subnormal operands to zero of the same sign). There are some differences from the kernel version. In the kernel, the "inexact" exception is set when flushing to zero. This does not appear to match the documented semantics for either of the architectures (alpha and sh) for which the kernel uses FP_DENORM_ZERO, so this patch does not set "inexact" in this case. More operations now use raw or semi-raw unpacking for optimization than did in the ten-year-old soft-fp version in the kernel, so checks of FP_DENORM_ZERO are inserted in those operations. They are also inserted for comparisons (which already used raw unpacking in the old version) as I believe that's the correct thing to do when input subnormals are flushed to zero. They are *not* inserted for _FP_NEG. (If any processors do flush input subnormals to zero for negation, or otherwise vary from the rules implemented when FP_DENORM_ZERO is set, further macros for sfp-machine.h to control this may need to be added.) Although the addition for comparisons will cause FP_EX_DENORM to be set in this case, it still won't be set for comparisons involving subnormals when not flushed to zero. It's quite possible that accurate emulation of processors that have such an exception for subnormal operands will require further changes relating to when FP_EX_DENORM is set (in general, the support for things defined by IEEE should be considered more reliable and mature than the support for things outside the scope of IEEE floating point). Although some processors also have a mode for abrupt underflow - producing zeroes instead of output subnormals - there is no such mode in the kernel's soft-fp, so no such mode is added to glibc's soft-fp (although it could be if someone wanted to emulate such processor support). Tested for powerpc-nofpu that the disassembly of installed shared libraries is unchanged by this patch. * soft-fp/soft-fp.h (FP_DENORM_ZERO): New macro. * soft-fp/op-common.h (_FP_UNPACK_CANONICAL): Check FP_DENORM_ZERO. (_FP_CHECK_FLUSH_ZERO): New macro. (_FP_ADD_INTERNAL): Call _FP_CHECK_FLUSH_ZERO. (_FP_CMP): Likewise. (_FP_CMP_EQ): Likewise. (_FP_TO_INT): Do not set inexact for subnormal arguments if FP_DENORM_ZERO. (FP_EXTEND): Call _FP_CHECK_FLUSH_ZERO. (FP_TRUNC): Likewise.
generated by cgit-pink 1.4.1 (git 2.36.1) at 2024-05-17 00:26:43 +0000