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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
181 lines
4.8 KiB
C
181 lines
4.8 KiB
C
/* compare256.c -- 256 byte memory comparison with match length return
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* Copyright (C) 2020 Nathan Moinvaziri
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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 "zutil_p.h"
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#include "fallback_builtins.h"
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/* ALIGNED, byte comparison */
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static inline uint32_t compare256_c_static(const uint8_t *src0, const uint8_t *src1) {
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uint32_t len = 0;
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do {
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if (*src0 != *src1)
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return len;
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src0 += 1, src1 += 1, len += 1;
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if (*src0 != *src1)
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return len;
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src0 += 1, src1 += 1, len += 1;
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if (*src0 != *src1)
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return len;
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src0 += 1, src1 += 1, len += 1;
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if (*src0 != *src1)
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return len;
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src0 += 1, src1 += 1, len += 1;
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if (*src0 != *src1)
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return len;
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src0 += 1, src1 += 1, len += 1;
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if (*src0 != *src1)
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return len;
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src0 += 1, src1 += 1, len += 1;
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if (*src0 != *src1)
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return len;
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src0 += 1, src1 += 1, len += 1;
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if (*src0 != *src1)
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return len;
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src0 += 1, src1 += 1, len += 1;
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} while (len < 256);
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return 256;
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}
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Z_INTERNAL uint32_t compare256_c(const uint8_t *src0, const uint8_t *src1) {
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return compare256_c_static(src0, src1);
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}
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#define LONGEST_MATCH longest_match_c
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#define COMPARE256 compare256_c_static
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#include "match_tpl.h"
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#define LONGEST_MATCH_SLOW
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#define LONGEST_MATCH longest_match_slow_c
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#define COMPARE256 compare256_c_static
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#include "match_tpl.h"
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#if defined(UNALIGNED_OK) && BYTE_ORDER == LITTLE_ENDIAN
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/* 16-bit unaligned integer comparison */
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static inline uint32_t compare256_unaligned_16_static(const uint8_t *src0, const uint8_t *src1) {
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uint32_t len = 0;
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do {
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if (zng_memcmp_2(src0, src1) != 0)
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return len + (*src0 == *src1);
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src0 += 2, src1 += 2, len += 2;
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if (zng_memcmp_2(src0, src1) != 0)
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return len + (*src0 == *src1);
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src0 += 2, src1 += 2, len += 2;
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if (zng_memcmp_2(src0, src1) != 0)
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return len + (*src0 == *src1);
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src0 += 2, src1 += 2, len += 2;
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if (zng_memcmp_2(src0, src1) != 0)
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return len + (*src0 == *src1);
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src0 += 2, src1 += 2, len += 2;
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} while (len < 256);
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return 256;
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}
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Z_INTERNAL uint32_t compare256_unaligned_16(const uint8_t *src0, const uint8_t *src1) {
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return compare256_unaligned_16_static(src0, src1);
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}
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#define LONGEST_MATCH longest_match_unaligned_16
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#define COMPARE256 compare256_unaligned_16_static
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#include "match_tpl.h"
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#define LONGEST_MATCH_SLOW
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#define LONGEST_MATCH longest_match_slow_unaligned_16
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#define COMPARE256 compare256_unaligned_16_static
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#include "match_tpl.h"
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#ifdef HAVE_BUILTIN_CTZ
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/* 32-bit unaligned integer comparison */
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static inline uint32_t compare256_unaligned_32_static(const uint8_t *src0, const uint8_t *src1) {
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uint32_t len = 0;
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do {
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uint32_t sv, mv, diff;
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memcpy(&sv, src0, sizeof(sv));
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memcpy(&mv, src1, sizeof(mv));
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diff = sv ^ mv;
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if (diff) {
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uint32_t match_byte = __builtin_ctz(diff) / 8;
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return len + match_byte;
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}
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src0 += 4, src1 += 4, len += 4;
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} while (len < 256);
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return 256;
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}
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Z_INTERNAL uint32_t compare256_unaligned_32(const uint8_t *src0, const uint8_t *src1) {
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return compare256_unaligned_32_static(src0, src1);
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}
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#define LONGEST_MATCH longest_match_unaligned_32
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#define COMPARE256 compare256_unaligned_32_static
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#include "match_tpl.h"
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#define LONGEST_MATCH_SLOW
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#define LONGEST_MATCH longest_match_slow_unaligned_32
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#define COMPARE256 compare256_unaligned_32_static
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#include "match_tpl.h"
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#endif
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#if defined(UNALIGNED64_OK) && defined(HAVE_BUILTIN_CTZLL)
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/* UNALIGNED64_OK, 64-bit integer comparison */
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static inline uint32_t compare256_unaligned_64_static(const uint8_t *src0, const uint8_t *src1) {
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uint32_t len = 0;
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do {
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uint64_t sv, mv, diff;
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memcpy(&sv, src0, sizeof(sv));
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memcpy(&mv, src1, sizeof(mv));
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diff = sv ^ mv;
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if (diff) {
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uint64_t match_byte = __builtin_ctzll(diff) / 8;
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return len + (uint32_t)match_byte;
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}
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src0 += 8, src1 += 8, len += 8;
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} while (len < 256);
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return 256;
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}
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Z_INTERNAL uint32_t compare256_unaligned_64(const uint8_t *src0, const uint8_t *src1) {
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return compare256_unaligned_64_static(src0, src1);
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}
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#define LONGEST_MATCH longest_match_unaligned_64
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#define COMPARE256 compare256_unaligned_64_static
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#include "match_tpl.h"
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#define LONGEST_MATCH_SLOW
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#define LONGEST_MATCH longest_match_slow_unaligned_64
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#define COMPARE256 compare256_unaligned_64_static
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#include "match_tpl.h"
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#endif
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#endif
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