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| author | Ulrich Drepper <drepper@gmail.com> | 2011-10-24 22:11:21 -0400 |
|---|---|---|
| committer | Ulrich Drepper <drepper@gmail.com> | 2011-10-24 22:11:21 -0400 |
| commit | 202c9deb15ee43bcbe70b36fa9bae050b8633c27 (patch) | |
| tree | da6f340b0a0475b22c0ec7664f2dfea47aaad153 /sysdeps/x86_64/fpu | |
| parent | 485683c35f020bd8b926e9673adb9b748380e8ce (diff) | |
| download | glibc-202c9deb15ee43bcbe70b36fa9bae050b8633c27.tar.gz glibc-202c9deb15ee43bcbe70b36fa9bae050b8633c27.tar.xz glibc-202c9deb15ee43bcbe70b36fa9bae050b8633c27.zip | |
Better DLA_FMS
It's better to use __builtin_fma if it works. Use it for gcc 4.6 and higher. Move the x86-64 dla.h to the correct place.
Diffstat (limited to 'sysdeps/x86_64/fpu')
| -rw-r--r-- | sysdeps/x86_64/fpu/dla.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/sysdeps/x86_64/fpu/dla.h b/sysdeps/x86_64/fpu/dla.h new file mode 100644 index 0000000000..fa2d52bbf0 --- /dev/null +++ b/sysdeps/x86_64/fpu/dla.h @@ -0,0 +1,17 @@ +#include <features.h> + +#ifdef __FMA4__ +# if __GNUC_PREREQ (4, 6) +# define DLA_FMS(x,y,z) \ + __builtin_fma (x, y, -(z)) +# else +# define DLA_FMS(x,y,z) \ + ({ double __z; \ + asm ("vfmsubsd %3, %2, %1, %0" \ + : "=x" (__z) \ + : "x" ((double) (x)), "xm" ((double) (y)) , "x" ((double) (z))); \ + __z; }) +# endif +#endif + +#include "sysdeps/ieee754/dbl-64/dla.h" |