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Zlib-ng is zlib replacement with optimizations for "next generation" systems. Its optimization may benifits image library decode and encode speed such as libpng. In our tests, if using zlib-ng and libpng combination on a x86_64 machine with AVX2, the time of `imdecode` amd `imencode` will drop 20% approximately. This patch enables zlib-ng's optimization if `CV_DISABLE_OPTIMIZATION` is OFF. Since Zlib-ng can dispatch intrinsics on the fly, port work is much easier. Related discussion: https://github.com/opencv/opencv/issues/22573
47 lines
1.9 KiB
C
47 lines
1.9 KiB
C
#ifndef AVX512_FUNCS_H
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#define AVX512_FUNCS_H
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#include <immintrin.h>
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#include <stdint.h>
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/* Written because *_add_epi32(a) sets off ubsan */
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static inline uint32_t _mm512_reduce_add_epu32(__m512i x) {
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__m256i a = _mm512_extracti64x4_epi64(x, 1);
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__m256i b = _mm512_extracti64x4_epi64(x, 0);
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__m256i a_plus_b = _mm256_add_epi32(a, b);
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__m128i c = _mm256_extracti128_si256(a_plus_b, 1);
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__m128i d = _mm256_extracti128_si256(a_plus_b, 0);
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__m128i c_plus_d = _mm_add_epi32(c, d);
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__m128i sum1 = _mm_unpackhi_epi64(c_plus_d, c_plus_d);
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__m128i sum2 = _mm_add_epi32(sum1, c_plus_d);
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__m128i sum3 = _mm_shuffle_epi32(sum2, 0x01);
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__m128i sum4 = _mm_add_epi32(sum2, sum3);
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return _mm_cvtsi128_si32(sum4);
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}
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static inline uint32_t partial_hsum(__m512i x) {
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/* We need a permutation vector to extract every other integer. The
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* rest are going to be zeros. Marking this const so the compiler stands
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* a better chance of keeping this resident in a register through entire
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* loop execution. We certainly have enough zmm registers (32) */
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const __m512i perm_vec = _mm512_setr_epi32(0, 2, 4, 6, 8, 10, 12, 14,
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1, 1, 1, 1, 1, 1, 1, 1);
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__m512i non_zero = _mm512_permutexvar_epi32(perm_vec, x);
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/* From here, it's a simple 256 bit wide reduction sum */
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__m256i non_zero_avx = _mm512_castsi512_si256(non_zero);
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/* See Agner Fog's vectorclass for a decent reference. Essentially, phadd is
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* pretty slow, much slower than the longer instruction sequence below */
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__m128i sum1 = _mm_add_epi32(_mm256_extracti128_si256(non_zero_avx, 1),
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_mm256_castsi256_si128(non_zero_avx));
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__m128i sum2 = _mm_add_epi32(sum1,_mm_unpackhi_epi64(sum1, sum1));
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__m128i sum3 = _mm_add_epi32(sum2,_mm_shuffle_epi32(sum2, 1));
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return (uint32_t)_mm_cvtsi128_si32(sum3);
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}
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#endif
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