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Convert VP8LFastSLog2 to fixed point

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Speedups: 1% with '-lossless', 2% with '-lossless -q 100 -m6'

Change-Id: I1d79ea8e3e9e4bac7bcea4d7cbcc1bd56273988e
This commit is contained in:
Vincent Rabaud
2024-07-09 15:44:18 +02:00
parent 66408c2c7c
commit fb444b692b
7 changed files with 128 additions and 260 deletions
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12
src/dsp/lossless_enc_sse2.c
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@ -237,10 +237,10 @@ static void AddVectorEq_SSE2(const uint32_t* a, uint32_t* out, int size) {
// when compared to -noasm.
#if !(defined(WEBP_HAVE_SLOW_CLZ_CTZ) || defined(__i386__) || defined(_M_IX86))
static float CombinedShannonEntropy_SSE2(const uint32_t X[256],
const uint32_t Y[256]) {
static uint64_t CombinedShannonEntropy_SSE2(const uint32_t X[256],
const uint32_t Y[256]) {
int i;
float retval = 0.f;
uint64_t retval = 0;
uint32_t sumX = 0, sumXY = 0;
const __m128i zero = _mm_setzero_si128();
@ -265,15 +265,15 @@ static float CombinedShannonEntropy_SSE2(const uint32_t X[256],
if ((mx >> j) & 1) {
const int x = X[i + j];
sumXY += x;
retval -= VP8LFastSLog2(x);
retval += VP8LFastSLog2(x);
}
xy = X[i + j] + Y[i + j];
sumX += xy;
retval -= VP8LFastSLog2(xy);
retval += VP8LFastSLog2(xy);
my &= my - 1;
}
}
retval += VP8LFastSLog2(sumX) + VP8LFastSLog2(sumXY);
retval = VP8LFastSLog2(sumX) + VP8LFastSLog2(sumXY) - retval;
return retval;
}