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1-2% faster quantization in SSE2

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C-version is a bit faster too (sub-1% faster on ARM)

Change-Id: I077262042f1d0937aba1ecf15174f2c51bf6cd97
This commit is contained in:
skal
2014-02-13 15:55:30 -08:00
parent b2fbc36c26
commit 0235d5e44b
4 changed files with 64 additions and 62 deletions
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8
src/enc/vp8enci.h
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@ -166,8 +166,8 @@ typedef int64_t score_t; // type used for scores, rate, distortion
#define BIAS(b) ((b) << (QFIX - 8))
// Fun fact: this is the _only_ line where we're actually being lossy and
// discarding bits.
static WEBP_INLINE int QUANTDIV(int n, int iQ, int B) {
return (n * iQ + B) >> QFIX;
static WEBP_INLINE int QUANTDIV(uint32_t n, uint32_t iQ, uint32_t B) {
return (int)((n * iQ + B) >> QFIX);
}
// size of histogram used by CollectHistogram.
@ -236,8 +236,8 @@ typedef struct {
typedef struct VP8Matrix {
uint16_t q_[16]; // quantizer steps
uint16_t iq_[16]; // reciprocals, fixed point.
uint16_t bias_[16]; // rounding bias
uint16_t zthresh_[16]; // value under which a coefficient is zeroed
uint32_t bias_[16]; // rounding bias
uint32_t zthresh_[16]; // value below which a coefficient is zeroed
uint16_t sharpen_[16]; // frequency boosters for slight sharpening
} VP8Matrix;