about summary refs log tree commit diff
path: root/sysdeps
diff options
context:
space:
mode:
authorUlrich Drepper <drepper@gmail.com>2011-10-24 22:11:21 -0400
committerUlrich Drepper <drepper@gmail.com>2011-10-24 22:11:21 -0400
commit202c9deb15ee43bcbe70b36fa9bae050b8633c27 (patch)
treeda6f340b0a0475b22c0ec7664f2dfea47aaad153 /sysdeps
parent485683c35f020bd8b926e9673adb9b748380e8ce (diff)
downloadglibc-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')
-rw-r--r--sysdeps/x86_64/fpu/dla.h (renamed from sysdeps/x86_64/dla.h)9
1 files changed, 8 insertions, 1 deletions
diff --git a/sysdeps/x86_64/dla.h b/sysdeps/x86_64/fpu/dla.h
index 6fe8f740f3..fa2d52bbf0 100644
--- a/sysdeps/x86_64/dla.h
+++ b/sysdeps/x86_64/fpu/dla.h
@@ -1,10 +1,17 @@
+#include <features.h>
+
 #ifdef __FMA4__
-# define DLA_FMS(x,y,z) \
+# 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"