sysdeps/x86_64/fpu/multiarch/s_fmaf.c

   1 /* FMA version of fmaf.
   2    Copyright (C) 2009-2023 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    <https://www.gnu.org/licenses/>.  */
  18
  19 #define NO_MATH_REDIRECT
  20 #include <config.h>
  21 #include <math.h>
  22 #include <init-arch.h>
  23 #include <libm-alias-float.h>
  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 static float
  37 __fmaf_fma4 (float x, float y, float z)
  38 {
  39   asm ("vfmaddss %3, %2, %1, %0" : "=x" (x) : "x" (x), "x" (y), "x" (z));
  40   return x;
  41 }
  42
  43
  44 libm_ifunc (__fmaf, CPU_FEATURE_USABLE (FMA)
  45             ? __fmaf_fma3 : (CPU_FEATURE_USABLE (FMA4)
  46                              ? __fmaf_fma4 : __fmaf_sse2));
  47 libm_alias_float (__fma, fma)
  48
  49 #define __fmaf __fmaf_sse2
  50
  51 #include <sysdeps/ieee754/dbl-64/s_fmaf.c>