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| author | Ulrich Drepper <drepper@redhat.com> | 2009-08-24 14:52:49 -0700 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 2009-08-24 14:52:49 -0700 |
| commit | 9a1ea1525eb8e02ce20eb93d65dc880186731bf7 (patch) | |
| tree | 4615ed06ce861d8837f182fcc2d679fb780d368d | |
| parent | 4a8f61a797e4c02c5ea7ab810af0816914ca5233 (diff) | |
| download | glibc-9a1ea1525eb8e02ce20eb93d65dc880186731bf7.tar.gz glibc-9a1ea1525eb8e02ce20eb93d65dc880186731bf7.tar.xz glibc-9a1ea1525eb8e02ce20eb93d65dc880186731bf7.zip | |
Optimize float construction/extraction on x86-64.
| -rw-r--r-- | ChangeLog | 5 | ||||
| -rw-r--r-- | sysdeps/x86_64/fpu/math_private.h | 20 |
2 files changed, 25 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog index bc1c0f17a9..c29660d652 100644 --- a/ChangeLog +++ b/ChangeLog @@ -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> * sysdeps/unix/syscall-template.S: New file. 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 |