| /* compare256_avx2.c -- AVX2 version of compare256 |
| * Copyright Mika T. Lindqvist <postmaster@raasu.org> |
| * For conditions of distribution and use, see copyright notice in zlib.h |
| */ |
| |
| #include "../../zbuild.h" |
| |
| #include "fallback_builtins.h" |
| |
| #if defined(X86_AVX2) && defined(HAVE_BUILTIN_CTZ) |
| |
| #include <immintrin.h> |
| #ifdef _MSC_VER |
| # include <nmmintrin.h> |
| #endif |
| |
| static inline uint32_t compare256_avx2_static(const uint8_t *src0, const uint8_t *src1) { |
| uint32_t len = 0; |
| |
| do { |
| __m256i ymm_src0, ymm_src1, ymm_cmp; |
| ymm_src0 = _mm256_loadu_si256((__m256i*)src0); |
| ymm_src1 = _mm256_loadu_si256((__m256i*)src1); |
| ymm_cmp = _mm256_cmpeq_epi8(ymm_src0, ymm_src1); /* non-identical bytes = 00, identical bytes = FF */ |
| unsigned mask = (unsigned)_mm256_movemask_epi8(ymm_cmp); |
| if (mask != 0xFFFFFFFF) { |
| uint32_t match_byte = (uint32_t)__builtin_ctz(~mask); /* Invert bits so identical = 0 */ |
| return len + match_byte; |
| } |
| |
| src0 += 32, src1 += 32, len += 32; |
| |
| ymm_src0 = _mm256_loadu_si256((__m256i*)src0); |
| ymm_src1 = _mm256_loadu_si256((__m256i*)src1); |
| ymm_cmp = _mm256_cmpeq_epi8(ymm_src0, ymm_src1); |
| mask = (unsigned)_mm256_movemask_epi8(ymm_cmp); |
| if (mask != 0xFFFFFFFF) { |
| uint32_t match_byte = (uint32_t)__builtin_ctz(~mask); |
| return len + match_byte; |
| } |
| |
| src0 += 32, src1 += 32, len += 32; |
| } while (len < 256); |
| |
| return 256; |
| } |
| |
| Z_INTERNAL uint32_t compare256_avx2(const uint8_t *src0, const uint8_t *src1) { |
| return compare256_avx2_static(src0, src1); |
| } |
| |
| #define LONGEST_MATCH longest_match_avx2 |
| #define COMPARE256 compare256_avx2_static |
| |
| #include "match_tpl.h" |
| |
| #define LONGEST_MATCH_SLOW |
| #define LONGEST_MATCH longest_match_slow_avx2 |
| #define COMPARE256 compare256_avx2_static |
| |
| #include "match_tpl.h" |
| |
| #endif |