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0de26fd78e
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
63 lines
1.7 KiB
C
63 lines
1.7 KiB
C
/*
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* SSE optimized hash slide
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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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*
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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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#include <assert.h>
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static inline void slide_hash_chain(Pos *table0, Pos *table1, uint32_t entries0,
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uint32_t entries1, const __m128i wsize) {
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uint32_t entries;
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Pos *table;
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__m128i value0, value1, result0, result1;
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int on_chain = 0;
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next_chain:
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table = (on_chain) ? table1 : table0;
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entries = (on_chain) ? entries1 : entries0;
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table += entries;
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table -= 16;
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/* ZALLOC allocates this pointer unless the user chose a custom allocator.
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* Our alloc function is aligned to 64 byte boundaries */
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do {
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value0 = _mm_load_si128((__m128i *)table);
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value1 = _mm_load_si128((__m128i *)(table + 8));
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result0 = _mm_subs_epu16(value0, wsize);
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result1 = _mm_subs_epu16(value1, wsize);
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_mm_store_si128((__m128i *)table, result0);
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_mm_store_si128((__m128i *)(table + 8), result1);
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table -= 16;
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entries -= 16;
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} while (entries > 0);
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++on_chain;
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if (on_chain > 1) {
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return;
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} else {
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goto next_chain;
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}
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}
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Z_INTERNAL void slide_hash_sse2(deflate_state *s) {
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uint16_t wsize = (uint16_t)s->w_size;
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const __m128i xmm_wsize = _mm_set1_epi16((short)wsize);
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assert(((uintptr_t)s->head & 15) == 0);
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assert(((uintptr_t)s->prev & 15) == 0);
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slide_hash_chain(s->head, s->prev, HASH_SIZE, wsize, xmm_wsize);
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}
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