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134 lines
3.4 KiB
134 lines
3.4 KiB
/* compare256_rle.h -- 256 byte run-length encoding comparison |
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* Copyright (C) 2022 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 "fallback_builtins.h" |
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typedef uint32_t (*compare256_rle_func)(const uint8_t* src0, const uint8_t* src1); |
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/* ALIGNED, byte comparison */ |
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static inline uint32_t compare256_rle_c(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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src1 += 1, len += 1; |
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if (*src0 != *src1) |
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return len; |
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src1 += 1, len += 1; |
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if (*src0 != *src1) |
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return len; |
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src1 += 1, len += 1; |
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if (*src0 != *src1) |
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return len; |
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src1 += 1, len += 1; |
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if (*src0 != *src1) |
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return len; |
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src1 += 1, len += 1; |
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if (*src0 != *src1) |
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return len; |
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src1 += 1, len += 1; |
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if (*src0 != *src1) |
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return len; |
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src1 += 1, len += 1; |
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if (*src0 != *src1) |
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return len; |
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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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#ifdef UNALIGNED_OK |
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/* 16-bit unaligned integer comparison */ |
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static inline uint32_t compare256_rle_unaligned_16(const uint8_t *src0, const uint8_t *src1) { |
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uint32_t len = 0; |
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uint16_t src0_cmp, src1_cmp; |
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memcpy(&src0_cmp, src0, sizeof(src0_cmp)); |
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do { |
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memcpy(&src1_cmp, src1, sizeof(src1_cmp)); |
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if (src0_cmp != src1_cmp) |
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return len + (*src0 == *src1); |
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src1 += 2, len += 2; |
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memcpy(&src1_cmp, src1, sizeof(src1_cmp)); |
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if (src0_cmp != src1_cmp) |
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return len + (*src0 == *src1); |
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src1 += 2, len += 2; |
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memcpy(&src1_cmp, src1, sizeof(src1_cmp)); |
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if (src0_cmp != src1_cmp) |
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return len + (*src0 == *src1); |
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src1 += 2, len += 2; |
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memcpy(&src1_cmp, src1, sizeof(src1_cmp)); |
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if (src0_cmp != src1_cmp) |
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return len + (*src0 == *src1); |
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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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#ifdef HAVE_BUILTIN_CTZ |
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/* 32-bit unaligned integer comparison */ |
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static inline uint32_t compare256_rle_unaligned_32(const uint8_t *src0, const uint8_t *src1) { |
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uint32_t sv, len = 0; |
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uint16_t src0_cmp; |
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memcpy(&src0_cmp, src0, sizeof(src0_cmp)); |
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sv = ((uint32_t)src0_cmp << 16) | src0_cmp; |
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do { |
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uint32_t mv, diff; |
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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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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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#endif |
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#if defined(UNALIGNED64_OK) && defined(HAVE_BUILTIN_CTZLL) |
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/* 64-bit unaligned integer comparison */ |
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static inline uint32_t compare256_rle_unaligned_64(const uint8_t *src0, const uint8_t *src1) { |
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uint32_t src0_cmp32, len = 0; |
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uint16_t src0_cmp; |
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uint64_t sv; |
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memcpy(&src0_cmp, src0, sizeof(src0_cmp)); |
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src0_cmp32 = ((uint32_t)src0_cmp << 16) | src0_cmp; |
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sv = ((uint64_t)src0_cmp32 << 32) | src0_cmp32; |
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do { |
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uint64_t mv, diff; |
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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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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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#endif |
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#endif |
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