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exr: optimize exr_halflt2uint()

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30% faster

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-04-09 20:55:09 +02:00
parent cabc0ac72f
commit 3532a87a25
1 changed files with 6 additions and 8 deletions
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14
libavcodec/exr.c
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@ -77,15 +77,13 @@ static inline uint16_t exr_flt2uint(uint32_t v)
*/ */
static inline uint16_t exr_halflt2uint(uint16_t v) static inline uint16_t exr_halflt2uint(uint16_t v)
{ {
int exp = v >> 10; unsigned exp = 14 - (v >> 10);
if (v & 0x8000) if (exp >= 14) {
return 0; if (exp == 14) return (v >> 9) & 1;
if (!exp) else return (v & 0x8000) ? 0 : 0xffff;
return (v >> 9) & 1; }
if (exp >= 15)
return 0xffff;
v <<= 6; v <<= 6;
return (v + (1 << 16)) >> (15 - exp); return (v + (1 << 16)) >> (exp + 1);
} }
/** /**