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authorUlrich Drepper <drepper@redhat.com>2009-08-24 14:52:49 -0700
committerUlrich Drepper <drepper@redhat.com>2009-08-24 14:52:49 -0700
commit9a1ea1525eb8e02ce20eb93d65dc880186731bf7 (patch)
tree4615ed06ce861d8837f182fcc2d679fb780d368d /sysdeps
parent4a8f61a797e4c02c5ea7ab810af0816914ca5233 (diff)
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Optimize float construction/extraction on x86-64.
Diffstat (limited to 'sysdeps')
-rw-r--r--sysdeps/x86_64/fpu/math_private.h20
1 files changed, 20 insertions, 0 deletions
diff --git a/sysdeps/x86_64/fpu/math_private.h b/sysdeps/x86_64/fpu/math_private.h
index 4febcbb5ec..8f4b792e77 100644
--- a/sysdeps/x86_64/fpu/math_private.h
+++ b/sysdeps/x86_64/fpu/math_private.h
@@ -18,4 +18,24 @@ do							\
 while (0)
 
 #include <math/math_private.h>
+
+/* We can do a few things better on x86-64.  */
+
+/* Direct movement of float into integer register.  */
+#undef GET_FLOAT_WORD
+#define GET_FLOAT_WORD(i,d) \
+do {								\
+  int i_;							\
+  asm ("movd %1, %0" : "=rm" (i_) : "x" (d));			\
+  (i) = i_;							\
+} while (0)
+
+/* And the reverse.  */
+#undef SET_FLOAT_WORD
+#define SET_FLOAT_WORD(d,i) \
+do {								\
+  int i_ = i;							\
+  asm ("movd %1, %0" : "=x" (d) : "rm" (i_));			\
+} while (0)
+
 #endif