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| author | Ulrich Drepper <drepper@gmail.com> | 2011-10-18 09:00:46 -0400 |
|---|---|---|
| committer | Ulrich Drepper <drepper@gmail.com> | 2011-10-18 09:00:46 -0400 |
| commit | d38f1dba009689d78af371cffa091b27e4ebe17d (patch) | |
| tree | da7daa82001d244a4dbc1ce6dc72cf4e8eac45db /sysdeps/x86_64 | |
| parent | 83c7615c2dc344562f6a1a499a269b114f74c7e5 (diff) | |
| download | glibc-d38f1dba009689d78af371cffa091b27e4ebe17d.tar.gz glibc-d38f1dba009689d78af371cffa091b27e4ebe17d.tar.xz glibc-d38f1dba009689d78af371cffa091b27e4ebe17d.zip | |
Start optimizing the use of the fenv interfaces in libm itself
Diffstat (limited to 'sysdeps/x86_64')
| -rw-r--r-- | sysdeps/x86_64/fpu/math_private.h | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/sysdeps/x86_64/fpu/math_private.h b/sysdeps/x86_64/fpu/math_private.h index 6cff8b3161..4886c64dc3 100644 --- a/sysdeps/x86_64/fpu/math_private.h +++ b/sysdeps/x86_64/fpu/math_private.h @@ -118,3 +118,45 @@ do { \ __res; }) # endif #endif + + +/* Specialized variants of the <fenv.h> interfaces which only handle + either the FPU or the SSE unit. */ +#undef libc_fegetround +#define libc_fegetround() \ + ({ \ + unsigned int mxcsr; \ + asm volatile ("stmxcsr %0" : "=m" (*&mxcsr)); \ + (mxcsr & 0x6000) >> 3; \ + }) +// #define libc_fegetroundf() fegetround () +// #define libc_fegetroundl() fegetround () + +#undef libc_fesetround +#define libc_fesetround(r) \ + do { \ + unsigned int mxcsr; \ + asm ("stmxcsr %0" : "=m" (*&mxcsr)); \ + mxcsr = (mxcsr & ~0x6000) | ((r) << 3); \ + asm volatile ("ldmxcsr %0" : : "m" (*&mxcsr)); \ + } while (0) +// #define libc_fesetroundf(r) (void) fesetround (r) +// #define libc_fesetroundl(r) (void) fesetround (r) + +#undef libc_feholdexcept +#define libc_feholdexcept(e) \ + do { \ + unsigned int mxcsr; \ + asm ("stmxcsr %0" : "=m" (*&mxcsr)); \ + (e)->__mxcsr = mxcsr; \ + mxcsr = (mxcsr | 0x1f80) & ~0x3f; \ + asm volatile ("ldmxcsr %0" : : "m" (*&mxcsr)); \ + } while (0) +// #define libc_feholdexceptf(e) (void) feholdexcept (e) +// #define libc_feholdexceptl(e) (void) feholdexcept (e) + +#undef libc_fesetenv +#define libc_fesetenv(e) \ + asm volatile ("ldmxcsr %0" : : "m" ((e)->__mxcsr)) +// #define libc_fesetenvf(e) (void) fesetenv (e) +// #define libc_fesetenvl(e) (void) fesetenv (e) |