sysdeps/x86_64/multiarch/s_fma.c

   1 /* FMA version of fma.
   2    Copyright (C) 2009, 2010 Free Software Foundation, Inc.
   3    Contributed by Intel Corporation.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA. */
  20
  21 #include <config.h>
  22 #include <math.h>
  23 #include <init-arch.h>
  24
  25 #ifdef HAVE_AVX_SUPPORT
  26
  27 extern double __fma_sse2 (double x, double y, double z) attribute_hidden;
  28
  29
  30 static double
  31 __fma_fma (double x, double y, double z)
  32 {
  33   asm ("vfmadd213sd %3, %2, %0" : "=x" (x) : "0" (x), "x" (y), "xm" (z));
  34   return x;
  35 }
  36
  37 libm_ifunc (__fma, HAS_FMA ? __fma_fma : __fma_sse2);
  38 weak_alias (__fma, fma)
  39
  40 # define __fma __fma_sse2
  41 #endif
  42
  43 #include <sysdeps/ieee754/dbl-64/s_fma.c>