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Add an accelerated version of F_TO_I for x86_64

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According to a quick micro-benchmark, this new version is 20% faster on my
Haswell laptop.

v2: Removed the XXX note about x86_64 from the comment
v3: Use an intrinsic instead of an __asm__ block.  This should give us MSVC
    support for free.
v4: Enable it for all x86_64 builds, not just with USE_X86_64_ASM

Signed-off-by: Jason Ekstrand <jason.ekstrand@intel.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
This commit is contained in:
Jason Ekstrand 2014-07-21 16:46:39 -07:00
parent 2a33510f16
commit 989d2e3709
1 changed files with 5 additions and 1 deletions
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6
src/mesa/main/imports.h
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@ -274,10 +274,12 @@ static inline int IROUND_POS(float f)
return (int) (f + 0.5F);
}
#ifdef __x86_64__
# include <xmmintrin.h>
#endif
/**
* Convert float to int using a fast method. The rounding mode may vary.
* XXX We could use an x86-64/SSE2 version here.
*/
static inline int F_TO_I(float f)
{
@ -292,6 +294,8 @@ static inline int F_TO_I(float f)
fistp r
}
return r;
#elif defined(__x86_64__)
return _mm_cvt_ss2si(_mm_load_ss(&f));
#else
return IROUND(f);
#endif