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2957f5084d
* Update zlibng * Set cmake path more directly in zlibng to hopefully fix an issue with the build on drone * I'm dumb, missing / in path * Mackal helps with a dumb gitignore issue * Adding all the files, not sure what's ignoring them and im tired of looking * Some tweaks to zlibng build to hopefully get it to build properly. works on msvc now
68 lines
2.2 KiB
C
68 lines
2.2 KiB
C
/* compare258_avx.c -- AVX2 version of compare258
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* Copyright Mika T. Lindqvist <postmaster@raasu.org>
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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.h"
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#include "fallback_builtins.h"
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#if defined(X86_AVX2) && defined(HAVE_BUILTIN_CTZ)
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#include <immintrin.h>
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#ifdef _MSC_VER
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# include <nmmintrin.h>
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#endif
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/* UNALIGNED_OK, AVX2 intrinsic comparison */
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static inline uint32_t compare256_unaligned_avx2_static(const unsigned char *src0, const unsigned char *src1) {
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uint32_t len = 0;
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do {
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__m256i ymm_src0, ymm_src1, ymm_cmp;
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ymm_src0 = _mm256_loadu_si256((__m256i*)src0);
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ymm_src1 = _mm256_loadu_si256((__m256i*)src1);
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ymm_cmp = _mm256_cmpeq_epi8(ymm_src0, ymm_src1); /* non-identical bytes = 00, identical bytes = FF */
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unsigned mask = (unsigned)_mm256_movemask_epi8(ymm_cmp);
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if (mask != 0xFFFFFFFF) {
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uint32_t match_byte = (uint32_t)__builtin_ctz(~mask); /* Invert bits so identical = 0 */
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return len + match_byte;
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}
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src0 += 32, src1 += 32, len += 32;
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ymm_src0 = _mm256_loadu_si256((__m256i*)src0);
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ymm_src1 = _mm256_loadu_si256((__m256i*)src1);
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ymm_cmp = _mm256_cmpeq_epi8(ymm_src0, ymm_src1);
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mask = (unsigned)_mm256_movemask_epi8(ymm_cmp);
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if (mask != 0xFFFFFFFF) {
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uint32_t match_byte = (uint32_t)__builtin_ctz(~mask);
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return len + match_byte;
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}
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src0 += 32, src1 += 32, len += 32;
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} while (len < 256);
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return 256;
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}
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static inline uint32_t compare258_unaligned_avx2_static(const unsigned char *src0, const unsigned char *src1) {
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if (*(uint16_t *)src0 != *(uint16_t *)src1)
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return (*src0 == *src1);
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return compare256_unaligned_avx2_static(src0+2, src1+2) + 2;
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}
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Z_INTERNAL uint32_t compare258_unaligned_avx2(const unsigned char *src0, const unsigned char *src1) {
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return compare258_unaligned_avx2_static(src0, src1);
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}
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#define LONGEST_MATCH longest_match_unaligned_avx2
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#define COMPARE256 compare256_unaligned_avx2_static
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#define COMPARE258 compare258_unaligned_avx2_static
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#include "match_tpl.h"
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#endif
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