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MIPS: MIPS32r1: Added optimizations for FastLog2

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Functions VP8LFastLog2Slow and VP8LFastSLog2Slow

also: replaced some "% y" by "& (y-1)" in the C-version
(since y is a power-of-two)

Change-Id: I875170384e3c333812ca42d6ce7278aecabd60f0
This commit is contained in:
Jovan Zelincevic
2014-03-24 14:47:19 +01:00
committed by skal
parent 3fe0291530
commit baabf1ea3a
7 changed files with 133 additions and 6 deletions
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7
src/dsp/lossless.h
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@ -122,8 +122,11 @@ static WEBP_INLINE uint32_t VP8LSubSampleSize(uint32_t size,
#define LOG_LOOKUP_IDX_MAX 256
extern const float kLog2Table[LOG_LOOKUP_IDX_MAX];
extern const float kSLog2Table[LOG_LOOKUP_IDX_MAX];
float VP8LFastLog2Slow(int v);
float VP8LFastSLog2Slow(int v);
typedef float (*VP8LFastLog2SlowFunc)(int v);
extern VP8LFastLog2SlowFunc VP8LFastLog2Slow;
extern VP8LFastLog2SlowFunc VP8LFastSLog2Slow;
static WEBP_INLINE float VP8LFastLog2(int v) {
return (v < LOG_LOOKUP_IDX_MAX) ? kLog2Table[v] : VP8LFastLog2Slow(v);
}