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Fully supporting TS 18661-3 _FloatN / _FloatNx types in the cases
where they have the same format as other supported types (in line with
the principles described at
<https://sourceware.org/ml/libc-alpha/2017-01/msg00333.html>) means
adding a lot of function aliases to libm (and a few to libc). float
functions will have *f32 aliases, double functions will have *f32x and
*f64 aliases, long double functions may have *f64x, *f128 or both
aliases depending on the configuration, float128 functions have have
*f64x aliases depending on the configuration.
At present, most individual libm functions have their own weak_alias
calls to define the public names for those functions. For TS 18661-3
support, it is desirable that functions not all need to duplicate the
logic for which alias names to define.
Thus, common macros for defining the public aliases to a libm function
make sense. In the double and long double cases, such macros will
also help simplify existing code (with LONG_DOUBLE_COMPAT
etc. conditionals), by eliminating existing conditionals and ldbl-opt
/ ldbl-64-128 wrappers (using the generated ldbl-compat-choose.h to
allow a single macro definition to expand appropriately for each
symbol depending on LONG_DOUBLE_COMPAT for that symbol).
This patch starts the process of adding such macros with a
straightforward case: a libm_alias_float macro, initially only used in
the case of type-generic templates, to define aliases for float
functions (currently just the *f public names, in future also *f32).
Future patches are intended to add such macros for other types and to
extend the cases in which they are used, with a view to as many places
as possible using them before support for _FloatN / _FloatNx aliases
is enabled. (I think it's inevitable that some places doing
architecture-specific things with aliases and symbol versioning may
end up needing to replicate logic for the new aliases, but hopefully
the number of such places can be kept to a minimum.)
The libm_alias_float macro takes unsuffixed names for both the
internal and public function names. The need for unsuffixed public
names is obvious, since such macros will end up defining multiple
public names with different suffixes. Unsuffixed internal names are
because I expect the ldbl-128 functions to end up in a form that
always defines *f128 names and sometimes also defines *l names - with
the main internal names being e.g. __ieee754_<func>f128 (so many
macros in float128_private.h can go away). But __ieee754_<func>l
aliases will still be needed for e.g. use from math/ complex
functions, meaning the alias macro needs to see just __ieee754_<func>
as internal name so it can create an alias based on that name. Since
libm_alias_float128 will thus need the unsuffixed internal name, it
seems to make sense for all such macros to receive the unsuffixed
name.
Tested for x86_64. Also tested with build-many-glibcs.py that
installed stripped shared libraries are unchanged by the patch.
* sysdeps/generic/libm-alias-float.h: New file.
* sysdeps/generic/math-type-macros-float.h: Include
<libm-alias-float.h>.
[!declare_mgen_alias] (declare_mgen_alias): Define macro.
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The initial obsoletion of SVID libm error handling left the old
wrappers and __kernel_standard still being used for new ports and
static linking, just with macro definitions of _LIB_VERSION and
matherr that meant symbols with those names were never actually used
and the code for different error handling variants could be optimized
out.
This patch cleans things up further by eliminating the
__kernel_standard use for new ports and static linking. Now, the old
wrappers no longer generate any code in the !LIBM_SVID_COMPAT case,
while the new errno-only wrappers that were added for float128 support
are now also used for float, double and long double in that case.
The changes are generally straightforward. The w_scalb*_compat
wrappers continue to be used (scalb is obsolescent in the sense of not
being supported for float128, but is present in supported standards -
the 2001 edition of POSIX and earlier XSI versions - so remains
supported for static linking and new ports, as do the float and long
double variants that are existing GNU extensions). Those wrappers
would only call __kernel_standard in the _LIB_VERSION == _SVID_ case.
Since we would like to be able to compile most of glibc without
optimization, relying on a static function whose only use is under an
if (0) condition being optimized away to avoid an undefined
__kernel_standard reference may not be a good idea. Thus, the
relevant code in the scalb wrappers has LIBM_SVID_COMPAT conditionals
added to guarantee it's not built at all in the case where
__kernel_standard does not exist.
Just as i386 has its own w_sqrt_compat.c, so w_sqrt.c is also added.
ia64 gets dummy w_*.c to prevent those files being built where they
would conflict with the ia64 libm, as with its existing w_*_compat.c.
Conditions disabling code for !LIBM_SVID_COMPAT are needed in both the
math/ wrappers and in the long double wrappers in ldbl-opt (to avoid
them setting up aliases and symbol versions for undefined symbols). I
hope that future cleanups to how libm function aliases and symbol
versioning are done will eliminate the need for most of the ldbl-opt
wrappers.
Tested for x86_64 and x86, and with build-many-glibcs.py.
* sysdeps/generic/math-type-macros-double.h: Include
<math-svid-compat.h>.
(__USE_WRAPPER_TEMPLATE): Define to !LIBM_SVID_COMPAT.
* sysdeps/generic/math-type-macros-float.h: Include
<math-svid-compat.h>.
(__USE_WRAPPER_TEMPLATE): Define to !LIBM_SVID_COMPAT.
* sysdeps/generic/math-type-macros-ldouble.h: Include
<math-svid-compat.h>.
(__USE_WRAPPER_TEMPLATE): Define to !LIBM_SVID_COMPAT.
* math/lgamma-compat.h (BUILD_LGAMMA): Include LIBM_SVID_COMPAT
condition.
* math/w_acos_compat.c: Condition contents on [LIBM_SVID_COMPAT].
* math/w_acosf_compat.c: Likewise.
* math/w_acosh_compat.c: Likewise.
* math/w_acoshf_compat.c: Likewise.
* math/w_acoshl_compat.c: Likewise.
* math/w_acosl_compat.c: Likewise.
* math/w_asin_compat.c: Likewise.
* math/w_asinf_compat.c: Likewise.
* math/w_asinl_compat.c: Likewise.
* math/w_atan2_compat.c: Likewise.
* math/w_atan2f_compat.c: Likewise.
* math/w_atan2l_compat.c: Likewise.
* math/w_atanh_compat.c: Likewise.
* math/w_atanhf_compat.c: Likewise.
* math/w_atanhl_compat.c: Likewise.
* math/w_cosh_compat.c: Likewise.
* math/w_coshf_compat.c: Likewise.
* math/w_coshl_compat.c: Likewise.
* math/w_exp10_compat.c: Likewise.
* math/w_exp10f_compat.c: Likewise.
* math/w_exp10l_compat.c: Likewise.
* math/w_exp2_compat.c: Likewise.
* math/w_exp2f_compat.c: Likewise.
* math/w_exp2l_compat.c: Likewise.
* math/w_fmod_compat.c: Likewise.
* math/w_fmodf_compat.c: Likewise.
* math/w_fmodl_compat.c: Likewise.
* math/w_hypot_compat.c: Likewise.
* math/w_hypotf_compat.c: Likewise.
* math/w_hypotl_compat.c: Likewise.
* math/w_j0_compat.c: Likewise.
* math/w_j0f_compat.c: Likewise.
* math/w_j0l_compat.c: Likewise.
* math/w_j1_compat.c: Likewise.
* math/w_j1f_compat.c: Likewise.
* math/w_j1l_compat.c: Likewise.
* math/w_jn_compat.c: Likewise.
* math/w_jnf_compat.c: Likewise.
* math/w_jnl_compat.c: Likewise.
* math/w_lgamma_r_compat.c: Likewise.
* math/w_lgammaf_r_compat.c: Likewise.
* math/w_lgammal_r_compat.c: Likewise.
* math/w_log10_compat.c: Likewise.
* math/w_log10f_compat.c: Likewise.
* math/w_log10l_compat.c: Likewise.
* math/w_log2_compat.c: Likewise.
* math/w_log2f_compat.c: Likewise.
* math/w_log2l_compat.c: Likewise.
* math/w_log_compat.c: Likewise.
* math/w_logf_compat.c: Likewise.
* math/w_logl_compat.c: Likewise.
* math/w_pow_compat.c: Likewise.
* math/w_powf_compat.c: Likewise.
* math/w_powl_compat.c: Likewise.
* math/w_remainder_compat.c: Likewise.
* math/w_remainderf_compat.c: Likewise.
* math/w_remainderl_compat.c: Likewise.
* math/w_sinh_compat.c: Likewise.
* math/w_sinhf_compat.c: Likewise.
* math/w_sinhl_compat.c: Likewise.
* math/w_sqrt_compat.c: Likewise.
* math/w_sqrtf_compat.c: Likewise.
* math/w_sqrtl_compat.c: Likewise.
* math/w_tgamma_compat.c: Likewise.
* math/w_tgammaf_compat.c: Likewise.
* math/w_tgammal_compat.c: Likewise.
* math/w_scalb_compat.c (sysv_scalb): Condition definition on
[LIBM_SVID_COMPAT].
(__scalb): Condition call to sysv_scalb on [LIBM_SVID_COMPAT].
* math/w_scalbf_compat.c (sysv_scalbf): Condition definition on
[LIBM_SVID_COMPAT].
(__scalbf): Condition call to sysv_scalbf on [LIBM_SVID_COMPAT].
* math/w_scalbl_compat.c (sysv_scalbl): Condition definition on
[LIBM_SVID_COMPAT].
(__scalbl): Condition call to sysv_scalbl on [LIBM_SVID_COMPAT].
* sysdeps/i386/fpu/w_sqrt.c: New file.
* sysdeps/ia64/fpu/w_acos.c: Likewise.
* sysdeps/ia64/fpu/w_acosf.c: Likewise.
* sysdeps/ia64/fpu/w_acosh.c: Likewise.
* sysdeps/ia64/fpu/w_acoshf.c: Likewise.
* sysdeps/ia64/fpu/w_acoshl.c: Likewise.
* sysdeps/ia64/fpu/w_acosl.c: Likewise.
* sysdeps/ia64/fpu/w_asin.c: Likewise.
* sysdeps/ia64/fpu/w_asinf.c: Likewise.
* sysdeps/ia64/fpu/w_asinl.c: Likewise.
* sysdeps/ia64/fpu/w_atan2.c: Likewise.
* sysdeps/ia64/fpu/w_atan2f.c: Likewise.
* sysdeps/ia64/fpu/w_atan2l.c: Likewise.
* sysdeps/ia64/fpu/w_atanh.c: Likewise.
* sysdeps/ia64/fpu/w_atanhf.c: Likewise.
* sysdeps/ia64/fpu/w_atanhl.c: Likewise.
* sysdeps/ia64/fpu/w_cosh.c: Likewise.
* sysdeps/ia64/fpu/w_coshf.c: Likewise.
* sysdeps/ia64/fpu/w_coshl.c: Likewise.
* sysdeps/ia64/fpu/w_exp.c: Likewise.
* sysdeps/ia64/fpu/w_exp10.c: Likewise.
* sysdeps/ia64/fpu/w_exp10f.c: Likewise.
* sysdeps/ia64/fpu/w_exp10l.c: Likewise.
* sysdeps/ia64/fpu/w_exp2.c: Likewise.
* sysdeps/ia64/fpu/w_exp2f.c: Likewise.
* sysdeps/ia64/fpu/w_exp2l.c: Likewise.
* sysdeps/ia64/fpu/w_expf.c: Likewise.
* sysdeps/ia64/fpu/w_expl.c: Likewise.
* sysdeps/ia64/fpu/w_fmod.c: Likewise.
* sysdeps/ia64/fpu/w_fmodf.c: Likewise.
* sysdeps/ia64/fpu/w_fmodl.c: Likewise.
* sysdeps/ia64/fpu/w_hypot.c: Likewise.
* sysdeps/ia64/fpu/w_hypotf.c: Likewise.
* sysdeps/ia64/fpu/w_hypotl.c: Likewise.
* sysdeps/ia64/fpu/w_lgamma_r.c: Likewise.
* sysdeps/ia64/fpu/w_lgammaf_r.c: Likewise.
* sysdeps/ia64/fpu/w_lgammal_r.c: Likewise.
* sysdeps/ia64/fpu/w_log.c: Likewise.
* sysdeps/ia64/fpu/w_log10.c: Likewise.
* sysdeps/ia64/fpu/w_log10f.c: Likewise.
* sysdeps/ia64/fpu/w_log10l.c: Likewise.
* sysdeps/ia64/fpu/w_log2.c: Likewise.
* sysdeps/ia64/fpu/w_log2f.c: Likewise.
* sysdeps/ia64/fpu/w_log2l.c: Likewise.
* sysdeps/ia64/fpu/w_logf.c: Likewise.
* sysdeps/ia64/fpu/w_logl.c: Likewise.
* sysdeps/ia64/fpu/w_pow.c: Likewise.
* sysdeps/ia64/fpu/w_powf.c: Likewise.
* sysdeps/ia64/fpu/w_powl.c: Likewise.
* sysdeps/ia64/fpu/w_remainder.c: Likewise.
* sysdeps/ia64/fpu/w_remainderf.c: Likewise.
* sysdeps/ia64/fpu/w_remainderl.c: Likewise.
* sysdeps/ia64/fpu/w_sinh.c: Likewise.
* sysdeps/ia64/fpu/w_sinhf.c: Likewise.
* sysdeps/ia64/fpu/w_sinhl.c: Likewise.
* sysdeps/ia64/fpu/w_sqrt.c: Likewise.
* sysdeps/ia64/fpu/w_sqrtf.c: Likewise.
* sysdeps/ia64/fpu/w_sqrtl.c: Likewise.
* sysdeps/ia64/fpu/w_tgamma.c: Likewise.
* sysdeps/ia64/fpu/w_tgammaf.c: Likewise.
* sysdeps/ia64/fpu/w_tgammal.c: Likewise.
* sysdeps/ieee754/dbl-64/w_exp_compat.c: Condition contents on
[LIBM_SVID_COMPAT].
* sysdeps/ieee754/flt-32/w_expf_compat.c: Likewise.
* sysdeps/ieee754/k_standard.c: Likewise.
* sysdeps/ieee754/k_standardf.c: Likewise.
* sysdeps/ieee754/k_standardl.c: Likewise.
* sysdeps/ieee754/ldbl-128/w_expl_compat.c: Likewise.
* sysdeps/ieee754/ldbl-128ibm/w_expl_compat.c: Likewise.
* sysdeps/ieee754/ldbl-96/w_expl_compat.c: Likewise.
* sysdeps/ieee754/ldbl-64-128/w_expl_compat.c: Condition
long_double_symbol call on [LIBM_SVID_COMPAT].
* sysdeps/ieee754/ldbl-opt/w_acoshl_compat.c: Likewise.
* sysdeps/ieee754/ldbl-opt/w_acosl_compat.c: Likewise.
* sysdeps/ieee754/ldbl-opt/w_asinl_compat.c: Likewise.
* sysdeps/ieee754/ldbl-opt/w_atan2l_compat.c: Likewise.
* sysdeps/ieee754/ldbl-opt/w_atanhl_compat.c: Likewise.
* sysdeps/ieee754/ldbl-opt/w_coshl_compat.c: Likewise.
* sysdeps/ieee754/ldbl-opt/w_fmodl_compat.c: Likewise.
* sysdeps/ieee754/ldbl-opt/w_hypotl_compat.c: Likewise.
* sysdeps/ieee754/ldbl-opt/w_j0l_compat.c: Likewise.
* sysdeps/ieee754/ldbl-opt/w_j1l_compat.c: Likewise.
* sysdeps/ieee754/ldbl-opt/w_jnl_compat.c: Likewise.
* sysdeps/ieee754/ldbl-opt/w_lgammal_r_compat.c: Likewise.
* sysdeps/ieee754/ldbl-opt/w_log10l_compat.c: Likewise.
* sysdeps/ieee754/ldbl-opt/w_log2l_compat.c: Likewise.
* sysdeps/ieee754/ldbl-opt/w_logl_compat.c: Likewise.
* sysdeps/ieee754/ldbl-opt/w_powl_compat.c: Likewise.
* sysdeps/ieee754/ldbl-opt/w_remainderl_compat.c: Likewise.
* sysdeps/ieee754/ldbl-opt/w_sinhl_compat.c: Likewise.
* sysdeps/ieee754/ldbl-opt/w_sqrtl_compat.c: Likewise.
* sysdeps/ieee754/ldbl-opt/w_tgammal_compat.c: Likewise.
* sysdeps/ieee754/ldbl-opt/w_exp10l_compat.c: Condition
long_double_symbol and compat_symbol calls on [LIBM_SVID_COMPAT].
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Several wrappers for IEEE functions use _LIB_VERSION / matherr /
__kernel_standard functionality, which we want to obsolete. New
wrappers, such as for float128, must not use this functionality.
This patch adds new wrappers that only __set_errno and can be used by
the new float128 wrappers.
Tested for powerpc64le.
* math/Makefile: Add wrappers to gen-libm-calls.
* math/w_acos_template.c: New file.
* math/w_acosh_template.c: Likewise.
* math/w_asin_template.c: Likewise.
* math/w_atan2_template.c: Likewise.
* math/w_atanh_template.c: Likewise.
* math/w_cosh_template.c: Likewise.
* math/w_exp10_template.c: Likewise.
* math/w_exp2_template.c: Likewise.
* math/w_exp_template.c: Likewise.
* math/w_fmod_template.c: Likewise.
* math/w_hypot_template.c: Likewise.
* math/w_j0_template.c: Likewise.
* math/w_j1_template.c: Likewise.
* math/w_jn_template.c: Likewise.
* math/w_lgamma_r_template.c: Likewise.
* math/w_lgamma_template.c: Likewise.
* math/w_log10_template.c: Likewise.
* math/w_log2_template.c: Likewise.
* math/w_log_template.c: Likewise.
* math/w_pow_template.c: Likewise.
* math/w_remainder_template.c: Likewise.
* math/w_sinh_template.c: Likewise.
* math/w_sqrt_template.c: Likewise.
* math/w_tgamma_template.c: Likewise.: Likewise.
* sysdeps/generic/math-type-macros-double.h
(__USE_WRAPPER_TEMPLATE): New macro to control inclusion of
the new wrappers.
* sysdeps/generic/math-type-macros-float.h: Likewise.
* sysdeps/generic/math-type-macros-ldouble.h: Likewise.
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This requires adding a macro to synthesize the call
to __strto*_nan. Since this is likely to be the only
usage ever for strto* functions in generated libm
calls, a dedicated macro is defined for it.
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This defines a new classes of libm objects. The
<func>_template.c file which is used in conjunction
with the new makefile hooks to derive variants for
each type supported by the target machine.
The headers math-type-macros-TYPE.h are used to supply
macros to a common implementation of a function in
a file named FUNC_template.c and glued togethor via
a generated file matching existing naming in the
build directory.
This has the properties of preserving the existing
override mechanism and not requiring any arcane
build system twiddling. Likewise, it enables machines
to override these files without any additional work.
I have verified the built objects for ppc64, x86_64,
alpha, arm, and m68k do not change in any meaningful
way with these changes using the Fedora cross toolchains.
I have verified the x86_64 and ppc64 changes still run.
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