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Add support for x86-64 fma instruction. 

Use it to implement fma and fmaf, if possible.
This commit is contained in:
Ulrich Drepper 2009-07-29 15:26:06 -07:00
parent 9a1d2d4555
commit 78c4ef475d
6 changed files with 110 additions and 2 deletions
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14
ChangeLog
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@ -1,5 +1,19 @@
2009-07-29 Ulrich Drepper <drepper@redhat.com>
* math/s_fma.c: Don't define alias if __fma is a macro.
* math/s_fmaf.c: Likewise.
* sysdeps/x86_64/multiarch/s_fma.c: New file.
* sysdeps/x86_64/multiarch/s_fmaf.c: New file.
Partially based on a patch by H.J. Lu <hongjiu.lu@intel.com>.
* sysdeps/x86_64/multiarch/init-arch.h (__get_cpu_features): Declare.
(HAS_POPCOUNT, HAS_SSE4_2): Add variants which work outside libc.
New macro HAS_FMA.
* sysdeps/x86_64/multiarch/init-arch.c (__get_cpu_features): New
function.
* include/libc-symbols.h (libm_ifunc): Define.
* sysdeps/x86_64/multiarch/Versions: New file.
* sysdeps/x86_64/dl-trampoline.S (_dl_runtime_profile): Improve CFI.
2009-07-28 H.J. Lu <hongjiu.lu@intel.com>

4
math/s_fma.c
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@ -1,5 +1,5 @@
/* Compute x * y + z as ternary operation.
Copyright (C) 1997, 2001 Free Software Foundation, Inc.
Copyright (C) 1997, 2001, 2009 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
@ -25,7 +25,9 @@ __fma (double x, double y, double z)
{
return (x * y) + z;
}
#ifndef __fma
weak_alias (__fma, fma)
#endif
#ifdef NO_LONG_DOUBLE
strong_alias (__fma, __fmal)

4
math/s_fmaf.c
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@ -1,5 +1,5 @@
/* Compute x * y + z as ternary operation.
Copyright (C) 1997 Free Software Foundation, Inc.
Copyright (C) 1997, 2009 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
@ -25,4 +25,6 @@ __fmaf (float x, float y, float z)
{
return (x * y) + z;
}
#ifndef __fmaf
weak_alias (__fmaf, fmaf)
#endif

5
sysdeps/x86_64/multiarch/Versions Normal file
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@ -0,0 +1,5 @@
libc {
GLIBC_PRIVATE {
__get_cpu_features;
}
}

43
sysdeps/x86_64/multiarch/s_fma.c Normal file
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@ -0,0 +1,43 @@
/* FMA version of fma.
Copyright (C) 2009 Free Software Foundation, Inc.
Contributed by Intel Corporation.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <config.h>
#include <math.h>
#include <init-arch.h>
#ifdef HAVE_AVX_SUPPORT
extern double __fma_sse2 (double x, double y, double z);
double
__fma_fma (double x, double y, double z)
{
asm ("vfmadd213sd %3, %2, %0" : "=x" (x) : "0" (x), "x" (y), "xm" (z));
return x;
}
libm_ifunc (__fma, HAS_FMA ? __fma_fma : __fma_sse2);
weak_alias (__fma, fma)
# define __fma __fma_sse2
#endif
#include <math/s_fma.c>

42
sysdeps/x86_64/multiarch/s_fmaf.c Normal file
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@ -0,0 +1,42 @@
/* FMA version of fmaf.
Copyright (C) 2009 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <config.h>
#include <math.h>
#include <init-arch.h>
#ifdef HAVE_AVX_SUPPORT
extern float __fmaf_sse2 (float x, float y, float z);
float
__fmaf_fma (float x, float y, float z)
{
asm ("vfmadd213ss %3, %2, %0" : "=x" (x) : "0" (x), "x" (y), "xm" (z));
return x;
}
libm_ifunc (__fmaf, HAS_FMA ? __fmaf_fma : __fmaf_sse2);
weak_alias (__fmaf, fmaf)
# define __fmaf __fmaf_sse2
#endif
#include <math/s_fmaf.c>