Some libm functions are unable to use the generic alias macros such as
libm_alias_double because they have special symbol versioning
requirements for the main float, double or long double public names.
To facilitate adding _FloatN / _FloatNx function aliases in future,
it's still desirable to have generic macros those functions can use as
far as possible. This patch adds macros such as
libm_alias_double_other, which only define names for _FloatN /
_FloatNx aliases, not for float / double / long double. As present,
all these new macros do nothing, but they are called in the
appropriate places in macros such as libm_alias_double. This patch
also arranges for lgamma implementations, and the recently added
optimized float function implementations, to use the new macros to
make them ready for addition of _FloatN / _FloatNx aliases.
Tested for x86_64, and tested with build-many-glibcs.py that installed
stripped shared libraries are unchanged by this patch.
* sysdeps/generic/libm-alias-double.h (libm_alias_double_other_r):
New macro.
(libm_alias_double_other): Likewise.
(libm_alias_double_r): Use libm_alias_double_other_r.
* sysdeps/generic/libm-alias-float.h (libm_alias_float_other_r):
New macro.
(libm_alias_float_other): Likewise.
(libm_alias_float_r): Use libm_alias_float_other_r.
* sysdeps/generic/libm-alias-float128.h
(libm_alias_float128_other_r): New macro.
(libm_alias_float128_other): Likewise.
(libm_alias_float128_r): Use libm_alias_float128_other_r.
* sysdeps/generic/libm-alias-ldouble.h
(libm_alias_ldouble_other_r): New macro.
(libm_alias_ldouble_other): Likewise.
(libm_alias_ldouble_r): Use libm_alias_ldouble_other_r.
* sysdeps/ieee754/ldbl-opt/libm-alias-double.h
(libm_alias_double_other_r): New macro.
(libm_alias_double_other): Likewise.
(libm_alias_double_r): Use libm_alias_double_other_r.
* sysdeps/ieee754/ldbl-opt/libm-alias-ldouble.h
(libm_alias_ldouble_other_r): New macro.
(libm_alias_ldouble_other): Likewise.
(libm_alias_ldouble_r): Use libm_alias_ldouble_other_r.
* math/w_lgamma_main.c: Include <libm-alias-double.h>.
[!USE_AS_COMPAT]: Use libm_alias_double_other.
* math/w_lgammaf_main.c: Include <libm-alias-float.h>.
[!USE_AS_COMPAT]: Use libm_alias_float_other.
* math/w_lgammal_main.c: Include <libm-alias-ldouble.h>.
[!USE_AS_COMPAT]: Use libm_alias_ldouble_other.
* math/w_exp2f.c: Use libm_alias_float_other.
* math/w_expf.c: Likewise.
* math/w_log2f.c: Likewise.
* math/w_logf.c: Likewise.
* math/w_powf.c: Likewise.
* sysdeps/ieee754/flt-32/e_exp2f.c: Include <libm-alias-float.h>.
[!__exp2f]: Use libm_alias_float_other.
* sysdeps/ieee754/flt-32/e_expf.c: Include <libm-alias-float.h>.
[!__expf]: Use libm_alias_float_other.
* sysdeps/ieee754/flt-32/e_log2f.c: Include <libm-alias-float.h>.
[!__log2f]: Use libm_alias_float_other.
* sysdeps/ieee754/flt-32/e_logf.c: Include <libm-alias-float.h>.
[!__logf]: Use libm_alias_float_other.
* sysdeps/ieee754/flt-32/e_powf.c: Include <libm-alias-float.h>.
[!__powf]: Use libm_alias_float_other.
Continuing the process of setting up common macros for libm function
aliases, with a view to using them to define _FloatN / _FloatNx
aliases in future, this patch adds a libm_alias_double macro and uses
it in the type-generic templates.
This macro handles defining aliases for double, and for long double in
the NO_LONG_DOUBLE case. It also handles defining compat symbols for
long double = double for architectures that changed their long double
format. By so doing, it eliminates the need for the
M_LIBM_NEED_COMPAT and declare_mgen_libm_compat macros; the single
declare_mgen_alias call in each template now suffices to define all
required compat symbols. When used for more double functions (not
based on type-generic templates), I expect it will eliminate the need
for most ldbl-opt wrappers for such functions.
A few special cases are needed. __clog10l is a public symbol (for
historical reasons) so needs to be given appropriate compat versions
for architectures that changed their long double format, but is not
defined as an alias using the normal macros since __clog10* are *not*
public symbols for _FloatN / _FloatNx types. For scalbn, scalbln and
log1p, the changes adding errno setting support for those functions
left compat symbols pointing directly to the non-errno-setting
implementations. There is no requirement for the compat symbols not
to set errno; that just made for the simplest patches at that time.
Now, with these common macros, it's natural to redirect the compat
symbols to the errno-setting wrappers, which I intend to do in a
separate patch.
Tested for x86_64, and with build-many-glibcs.py. For ldbl-opt
platforms the stripped libm.so binaries are changed (disassembly
unchanged) because the details of how the clog10l compat symbol is
created mean it ceases to be weak as it was before; for other
platforms, stripped libm.so binaries are unchanged.
2017-09-13 Joseph Myers <joseph@codesourcery.com>
* sysdeps/generic/libm-alias-double.h: New file.
* sysdeps/ieee754/ldbl-opt/libm-alias-double.h: Likewise.
* sysdeps/generic/math-type-macros-double.h: Include
<libm-alias-double.h>.
[declare_mgen_alias] (declare_mgen_alias): Define to use
libm_alias_double.
* sysdeps/generic/math-type-macros.h [!M_LIBM_NEED_COMPAT]
(M_LIBM_NEED_COMPAT): Remove macro.
[!M_LIBM_NEED_COMPAT] (declare_mgen_libm_compat): Likewise.
* sysdeps/ieee754/ldbl-opt/math-type-macros-double.h: Remove.
* math/cabs_template.c [M_LIBM_NEED_COMPAT]: Remove conditional
code.
* math/carg_template.c [M_LIBM_NEED_COMPAT]: Likewise.
* math/cimag_template.c [M_LIBM_NEED_COMPAT]: Likewise.
* math/conj_template.c [M_LIBM_NEED_COMPAT]: Likewise.
* math/creal_template.c [M_LIBM_NEED_COMPAT]: Likewise.
* math/s_cacos_template.c [M_LIBM_NEED_COMPAT]: Likewise.
* math/s_cacosh_template.c [M_LIBM_NEED_COMPAT]: Likewise.
* math/s_casin_template.c [M_LIBM_NEED_COMPAT]: Likewise.
* math/s_casinh_template.c [M_LIBM_NEED_COMPAT]: Likewise.
* math/s_catan_template.c [M_LIBM_NEED_COMPAT]: Likewise.
* math/s_catanh_template.c [M_LIBM_NEED_COMPAT]: Likewise.
* math/s_ccos_template.c [M_LIBM_NEED_COMPAT]: Likewise.
* math/s_ccosh_template.c [M_LIBM_NEED_COMPAT]: Likewise.
* math/s_cexp_template.c [M_LIBM_NEED_COMPAT]: Likewise.
* math/s_clog10_template.c [M_LIBM_NEED_COMPAT]: Likewise.
* math/s_clog_template.c [M_LIBM_NEED_COMPAT]: Likewise.
* math/s_cpow_template.c [M_LIBM_NEED_COMPAT]: Likewise.
* math/s_cproj_template.c [M_LIBM_NEED_COMPAT]: Likewise.
* math/s_csin_template.c [M_LIBM_NEED_COMPAT]: Likewise.
* math/s_csinh_template.c [M_LIBM_NEED_COMPAT]: Likewise.
* math/s_csqrt_template.c [M_LIBM_NEED_COMPAT]: Likewise.
* math/s_ctan_template.c [M_LIBM_NEED_COMPAT]: Likewise.
* math/s_ctanh_template.c [M_LIBM_NEED_COMPAT]: Likewise.
* math/s_fdim_template.c [M_LIBM_NEED_COMPAT]: Likewise.
* math/s_fmax_template.c [M_LIBM_NEED_COMPAT]: Likewise.
* math/s_fmin_template.c [M_LIBM_NEED_COMPAT]: Likewise.
* math/s_nan_template.c [M_LIBM_NEED_COMPAT]: Likewise.
* math/w_ilogb_template.c [M_LIBM_NEED_COMPAT]: Likewise.
* sysdeps/ieee754/ldbl-opt/s_clog10.c: New file.
* sysdeps/ieee754/ldbl-opt/s_ldexp.c (M_LIBM_NEED_COMPAT): Remove
macro.
(declare_mgen_alias): New macro.
* sysdeps/ieee754/ldbl-opt/w_log1p.c: New file.
* sysdeps/ieee754/ldbl-opt/w_scalbln.c: Likewise.
* sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/s_fdim-vis3.c
(M_LIBM_NEED_COMPAT): Remove macro.
* sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/s_fdim.c
[HAVE_AS_VIS3_SUPPORT]: Include <math_ldbl_opt.h> and
<first-versions.h>.
[HAVE_AS_VIS3_SUPPORT && LONG_DOUBLE_COMPAT (libm,
FIRST_VERSION_libm_fdiml)]: Define fdiml as compat symbol.
Joseph Myers