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180 lines
4.8 KiB
180 lines
4.8 KiB
/* 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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