81325b12b1
This patch adds support for *f128 function aliases on platforms where long double has the binary128 format (and thus GCC 7 provides the _Float128 type with the same ABI as long double but as a distinct type in terms of C type compatibility). This is the same API as provided in glibc 2.26 for powerpc64le / x86_64 / x86 / ia64 where _Float128 has a different format from long double, with the bulk of the API coming from TS 18661-3. All the functions alias the corresponding long double functions, and __* function names are not provided since those are only needed once for each floating-point format, not more than once for different types with the same format (so for example, -ffinite-math-only maps foof128 to __fool_finite, while type-generic macros end up calling e.g. __issignalingl for _Float128 arguments on such platforms). The preparation for this feature was done in previous patches, so this one just needs to add the relevant makefile and header definitions, and update macro definitions of libm_alias_ldouble_other_r, to turn on the feature, and update documentation and ABI baselines. Tested (a) for x86_64, (b) for aarch64, (c) with build-many-glibcs.py with both GCC 6 and GCC 7. * sysdeps/ieee754/ldbl-128/Makeconfig: New file. * sysdeps/ieee754/ldbl-128/bits/floatn.h: Likewise. * sysdeps/ieee754/ldbl-128/float128-abi.h: Likewise. * sysdeps/generic/libm-alias-ldouble.h: Include <bits/floatn.h>. [__HAVE_FLOAT128 && !__HAVE_DISTINCT_FLOAT128] (libm_alias_ldouble_other_r): Also create _Float128 alias. * sysdeps/ieee754/ldbl-opt/libm-alias-ldouble.h: Include <bits/floatn.h>. [__HAVE_FLOAT128 && !__HAVE_DISTINCT_FLOAT128] (libm_alias_ldouble_other_r): Also create _Float128 alias. * manual/math.texi (Mathematics): Document additional architecture support for _Float128. * sysdeps/unix/sysv/linux/aarch64/libc.abilist: Update. * sysdeps/unix/sysv/linux/aarch64/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/alpha/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/alpha/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/mips/mips64/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/s390/s390-32/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/s390/s390-64/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/sparc/sparc32/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/sparc/sparc64/libm.abilist: Likewise.
55 lines
2.2 KiB
C
55 lines
2.2 KiB
C
/* Define aliases for libm long double functions.
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Copyright (C) 2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _LIBM_ALIAS_LDOUBLE_H
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#define _LIBM_ALIAS_LDOUBLE_H
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#include <bits/floatn.h>
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/* Define _FloatN / _FloatNx aliases for a long double libm function
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that has internal name FROM ## l ## R and public names TO ## suffix
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## R for each suffix of a supported _FloatN / _FloatNx
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floating-point type with the same format as long double. */
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#if __HAVE_FLOAT128 && !__HAVE_DISTINCT_FLOAT128
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# define libm_alias_ldouble_other_r(from, to, r) \
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weak_alias (from ## l ## r, to ## f128 ## r)
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#else
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# define libm_alias_ldouble_other_r(from, to, r)
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#endif
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/* Likewise, but without the R suffix. */
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#define libm_alias_ldouble_other(from, to) \
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libm_alias_ldouble_other_r (from, to, )
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/* Define aliases for a long double libm function that has internal
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name FROM ## l ## R and public names TO ## suffix ## R for each
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suffix of a supported floating-point type with the same format as
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long double. This should only be used for functions where such
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public names exist for _FloatN types, not for
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implementation-namespace exported names (where there is one name
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per format, not per type) or for obsolescent functions not provided
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for _FloatN types. */
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#define libm_alias_ldouble_r(from, to, r) \
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weak_alias (from ## l ## r, to ## l ## r) \
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libm_alias_ldouble_other_r (from, to, r)
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/* Likewise, but without the R suffix. */
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#define libm_alias_ldouble(from, to) libm_alias_ldouble_r (from, to, )
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#endif
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