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| author | Jakub Jelinek <jakub@redhat.com> | 2020-04-22 19:17:15 +0200 |
|---|---|---|
| committer | Jakub Jelinek <jakub@redhat.com> | 2020-04-22 21:34:19 +0200 |
| commit | 1868599f8daf7798018ce8a8f314015f5a2ac520 (patch) | |
| tree | 4a9e4d8e1017d6bc4c3f1de3eaff89af049d9c90 /libgfortran/configure.ac | |
| parent | 545f1addf7247a800bbb943650efaa4c35d3bd1d (diff) | |
libgfortran: Provide some further math library fallbacks [PR94694]
The following patch provides some further math library fallbacks.
fmaf can be implemented using fma if available, fma and fmal can use
x * y + z as fallback, it is not perfect, but e.g. glibc on various arches
has been using that as fallback for many years,
and copysign/copysignl/fabs/fabsl can be implemented using corresponding
__builtin_* if we make sure that gcc expands it inline instead of using
a library call (these days it is expanded inline on most targets).
2020-04-22 Jakub Jelinek <jakub@redhat.com>
PR libfortran/94694
PR libfortran/94586
* configure.ac: Add math func checks for fmaf, fma and fmal. Add
HAVE_INLINE_BUILTIN_COPYSIGN check.
* c99_protos.h (copysign, fmaf, fma, fmal): Provide fallback
prototypes.
(HAVE_COPYSIGN, HAVE_FMAF, HAVE_FMA, HAVE_FMAL): Define if not
defined and fallback version is provided.
* intrinsics/c99_functions.c (copysign, fmaf, fma, fmal): Provide
fallback implementations if possible
* configure: Regenerated.
* config.h.in: Regenerated.
* math.m4 (GCC_CHECK_MATH_INLINE_BUILTIN_FALLBACK1,
GCC_CHECK_MATH_INLINE_BUILTIN_FALLBACK2): New.
Diffstat (limited to 'libgfortran/configure.ac')
| -rw-r--r-- | libgfortran/configure.ac | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/libgfortran/configure.ac b/libgfortran/configure.ac index b2b9ee994aa..711dc60ff78 100644 --- a/libgfortran/configure.ac +++ b/libgfortran/configure.ac @@ -392,6 +392,9 @@ GCC_CHECK_MATH_FUNC([cabsl]) GCC_CHECK_MATH_FUNC([floorf]) GCC_CHECK_MATH_FUNC([floor]) GCC_CHECK_MATH_FUNC([floorl]) +GCC_CHECK_MATH_FUNC([fmaf]) +GCC_CHECK_MATH_FUNC([fma]) +GCC_CHECK_MATH_FUNC([fmal]) GCC_CHECK_MATH_FUNC([fmodf]) GCC_CHECK_MATH_FUNC([fmod]) GCC_CHECK_MATH_FUNC([fmodl]) @@ -516,6 +519,11 @@ GCC_CHECK_MATH_FUNC([catanl]) # On AIX, clog is present in libm as __clog AC_CHECK_LIB([m],[__clog],[AC_DEFINE([HAVE_CLOG],[1],[libm includes clog])]) +GCC_CHECK_MATH_INLINE_BUILTIN_FALLBACK2([copysign], [double]) +GCC_CHECK_MATH_INLINE_BUILTIN_FALLBACK2([copysignl], [long double]) +GCC_CHECK_MATH_INLINE_BUILTIN_FALLBACK1([fabs], [double]) +GCC_CHECK_MATH_INLINE_BUILTIN_FALLBACK1([fabsl], [long double]) + # Check whether the system has a working stat() LIBGFOR_CHECK_WORKING_STAT |