sysdeps/x86_64/fpu/multiarch/s_fma.c

   1 /* FMA version of fma.
   2    Copyright (C) 2009-2015 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, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <config.h>
  21 #include <math.h>
  22 #include <init-arch.h>
  23
  24 #ifdef HAVE_AVX_SUPPORT
  25
  26 extern double __fma_sse2 (double x, double y, double z) attribute_hidden;
  27
  28
  29 static double
  30 __fma_fma3 (double x, double y, double z)
  31 {
  32   asm ("vfmadd213sd %3, %2, %0" : "=x" (x) : "0" (x), "x" (y), "xm" (z));
  33   return x;
  34 }
  35
  36
  37 # ifdef HAVE_FMA4_SUPPORT
  38 static double
  39 __fma_fma4 (double x, double y, double z)
  40 {
  41   asm ("vfmaddsd %3, %2, %1, %0" : "=x" (x) : "x" (x), "x" (y), "x" (z));
  42   return x;
  43 }
  44 # else
  45 #  undef HAS_FMA4
  46 #  define HAS_FMA4 0
  47 #  define __fma_fma4 ((void *) 0)
  48 # endif
  49
  50
  51 libm_ifunc (__fma, HAS_FMA
  52             ? __fma_fma3 : (HAS_FMA4 ? __fma_fma4 : __fma_sse2));
  53 weak_alias (__fma, fma)
  54
  55 # define __fma __fma_sse2
  56 #endif
  57
  58 #include <sysdeps/ieee754/dbl-64/s_fma.c>