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39 lines
1.1 KiB
39 lines
1.1 KiB
/* |
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* AVX2 optimized hash slide, based on Intel's slide_sse implementation |
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* |
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* Copyright (C) 2017 Intel Corporation |
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* Authors: |
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* Arjan van de Ven <arjan@linux.intel.com> |
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* Jim Kukunas <james.t.kukunas@linux.intel.com> |
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* Mika T. Lindqvist <postmaster@raasu.org> |
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* |
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* For conditions of distribution and use, see copyright notice in zlib.h |
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*/ |
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#include "../../zbuild.h" |
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#include "../../deflate.h" |
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#include <immintrin.h> |
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static inline void slide_hash_chain(Pos *table, uint32_t entries, const __m256i wsize) { |
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table += entries; |
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table -= 16; |
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do { |
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__m256i value, result; |
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value = _mm256_loadu_si256((__m256i *)table); |
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result = _mm256_subs_epu16(value, wsize); |
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_mm256_storeu_si256((__m256i *)table, result); |
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table -= 16; |
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entries -= 16; |
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} while (entries > 0); |
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} |
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Z_INTERNAL void slide_hash_avx2(deflate_state *s) { |
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uint16_t wsize = (uint16_t)s->w_size; |
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const __m256i ymm_wsize = _mm256_set1_epi16((short)wsize); |
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slide_hash_chain(s->head, HASH_SIZE, ymm_wsize); |
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slide_hash_chain(s->prev, wsize, ymm_wsize); |
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}
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