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Use inline asm for DLA_FMS because of broken old compilers

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Ulrich Drepper 2011-10-24 21:17:10 -04:00
parent af968f62f2
commit a0cf1edd4c
2 changed files with 9 additions and 2 deletions
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ChangeLog
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2011-10-24 Ulrich Drepper <drepper@gmail.com>
* sysdeps/x86_64/dla.h (DLA_FMS): Some compilers fail to inline
__builtin_fma in some situations. Have to use an asm.
* config.make.in: Add have-mfma4 entry.
* configure.in: Substitute libc_cv_cc_fma4.
* math/Makefile (dbl-only-routines): Add sincostab.

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sysdeps/x86_64/dla.h
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#if defined __FMA4__ || defined __FMA__
#ifdef __FMA4__
# define DLA_FMS(x,y,z) \
__builtin_fma (x, y, -z)
({ double __z; \
asm ("vfmsubsd %3, %2, %1, %0" \
: "=x" (__z) \
: "x" ((double) (x)), "xm" ((double) (y)) , "x" ((double) (z))); \
__z; })
#endif
#include "sysdeps/ieee754/dbl-64/dla.h"