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Revert Average3 and Average4

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Average3 created a slowdown of 1-2% in lossless decoding.
Average4 created a slowdown of 2-3% in lossless decoding.

Change-Id: Ic2e62cdd83fc897887ec2bf41ea7cadbada84fe5
This commit is contained in:
Vincent Rabaud 2016-12-07 15:32:33 +01:00
parent fbfb3bef7b
commit 54ab2e758f
1 changed files with 23 additions and 10 deletions
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33
src/dsp/lossless_sse2.c
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@ -99,6 +99,14 @@ static WEBP_INLINE void Average2_uint32(const uint32_t a0, const uint32_t a1,
*avg = _mm_sub_epi8(avg1, one);
}
static WEBP_INLINE __m128i Average2_uint32_16(uint32_t a0, uint32_t a1) {
const __m128i zero = _mm_setzero_si128();
const __m128i A0 = _mm_unpacklo_epi8(_mm_cvtsi32_si128(a0), zero);
const __m128i A1 = _mm_unpacklo_epi8(_mm_cvtsi32_si128(a1), zero);
const __m128i sum = _mm_add_epi16(A1, A0);
return _mm_srli_epi16(sum, 1);
}
static WEBP_INLINE uint32_t Average2(uint32_t a0, uint32_t a1) {
__m128i output;
Average2_uint32(a0, a1, &output);
@ -106,20 +114,25 @@ static WEBP_INLINE uint32_t Average2(uint32_t a0, uint32_t a1) {
}
static WEBP_INLINE uint32_t Average3(uint32_t a0, uint32_t a1, uint32_t a2) {
const __m128i A1 = _mm_cvtsi32_si128(a1);
__m128i output, avg1;
Average2_uint32(a0, a2, &avg1);
Average2_m128i(&avg1, &A1, &output);
return _mm_cvtsi128_si32(output);
const __m128i zero = _mm_setzero_si128();
const __m128i avg1 = Average2_uint32_16(a0, a2);
const __m128i A1 = _mm_unpacklo_epi8(_mm_cvtsi32_si128(a1), zero);
const __m128i sum = _mm_add_epi16(avg1, A1);
const __m128i avg2 = _mm_srli_epi16(sum, 1);
const __m128i A2 = _mm_packus_epi16(avg2, avg2);
const uint32_t output = _mm_cvtsi128_si32(A2);
return output;
}
static WEBP_INLINE uint32_t Average4(uint32_t a0, uint32_t a1,
uint32_t a2, uint32_t a3) {
__m128i avg1, avg2, avg3;
Average2_uint32(a0, a1, &avg1);
Average2_uint32(a2, a3, &avg2);
Average2_m128i(&avg1, &avg2, &avg3);
return _mm_cvtsi128_si32(avg3);
const __m128i avg1 = Average2_uint32_16(a0, a1);
const __m128i avg2 = Average2_uint32_16(a2, a3);
const __m128i sum = _mm_add_epi16(avg2, avg1);
const __m128i avg3 = _mm_srli_epi16(sum, 1);
const __m128i A0 = _mm_packus_epi16(avg3, avg3);
const uint32_t output = _mm_cvtsi128_si32(A0);
return output;
}
static uint32_t Predictor5_SSE2(uint32_t left, const uint32_t* const top) {