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Optimize float construction/extraction on x86-64.

This commit is contained in:
Ulrich Drepper 2009-08-24 14:52:49 -07:00
parent 4a8f61a797
commit 9a1ea1525e
2 changed files with 25 additions and 0 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2009-08-24 Ulrich Drepper <drepper@redhat.com>
* sysdeps/x86_64/fpu/math_private.h: Add specialized GET_FLOAT_WORD
and SET_FLOAT_WORD definitions.
2009-08-24 Roland McGrath <roland@redhat.com> 2009-08-24 Roland McGrath <roland@redhat.com>
* sysdeps/unix/syscall-template.S: New file. * sysdeps/unix/syscall-template.S: New file.

20
sysdeps/x86_64/fpu/math_private.h
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@ -18,4 +18,24 @@ do \
while (0) while (0)
#include <math/math_private.h> #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 #endif