sysdeps/x86_64/fpu/multiarch/s_fmaf.c

   1 /* FMA version of fmaf.
   2    Copyright (C) 2009-2015 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <config.h>
  20 #include <math.h>
  21 #include <init-arch.h>
  22
  23 #ifdef HAVE_AVX_SUPPORT
  24
  25 extern float __fmaf_sse2 (float x, float y, float z) attribute_hidden;
  26
  27
  28 static float
  29 __fmaf_fma3 (float x, float y, float z)
  30 {
  31   asm ("vfmadd213ss %3, %2, %0" : "=x" (x) : "0" (x), "x" (y), "xm" (z));
  32   return x;
  33 }
  34
  35
  36 # ifdef HAVE_FMA4_SUPPORT
  37 static float
  38 __fmaf_fma4 (float x, float y, float z)
  39 {
  40   asm ("vfmaddss %3, %2, %1, %0" : "=x" (x) : "x" (x), "x" (y), "x" (z));
  41   return x;
  42 }
  43 # else
  44 #  undef HAS_FMA4
  45 #  define HAS_FMA4 0
  46 #  define __fmaf_fma4 ((void *) 0)
  47 # endif
  48
  49
  50 libm_ifunc (__fmaf, HAS_FMA
  51             ? __fmaf_fma3 : (HAS_FMA4 ? __fmaf_fma4 : __fmaf_sse2));
  52 weak_alias (__fmaf, fmaf)
  53
  54 # define __fmaf __fmaf_sse2
  55 #endif
  56
  57 #include <sysdeps/ieee754/dbl-64/s_fmaf.c>