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101 lines
3.0 KiB
101 lines
3.0 KiB
/* chunkset_ssse3.c -- SSSE3 inline functions to copy small data chunks. |
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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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/* This requires SSE2 support. While it's implicit with SSSE3, we can minimize |
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* code size by sharing the chunkcopy functions, which will certainly compile |
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* to identical machine code */ |
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#if defined(X86_SSSE3) && defined(X86_SSE2) |
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#include <immintrin.h> |
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#include "../generic/chunk_permute_table.h" |
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typedef __m128i chunk_t; |
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#define CHUNK_SIZE 16 |
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#define HAVE_CHUNKMEMSET_2 |
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#define HAVE_CHUNKMEMSET_4 |
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#define HAVE_CHUNKMEMSET_8 |
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#define HAVE_CHUNK_MAG |
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#define HAVE_CHUNKCOPY |
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#define HAVE_CHUNKUNROLL |
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static const lut_rem_pair perm_idx_lut[13] = { |
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{0, 1}, /* 3 */ |
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{0, 0}, /* don't care */ |
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{1 * 32, 1}, /* 5 */ |
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{2 * 32, 4}, /* 6 */ |
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{3 * 32, 2}, /* 7 */ |
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{0 * 32, 0}, /* don't care */ |
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{4 * 32, 7}, /* 9 */ |
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{5 * 32, 6}, /* 10 */ |
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{6 * 32, 5}, /* 11 */ |
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{7 * 32, 4}, /* 12 */ |
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{8 * 32, 3}, /* 13 */ |
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{9 * 32, 2}, /* 14 */ |
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{10 * 32, 1},/* 15 */ |
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}; |
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static inline void chunkmemset_2(uint8_t *from, chunk_t *chunk) { |
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int16_t tmp; |
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memcpy(&tmp, from, sizeof(tmp)); |
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*chunk = _mm_set1_epi16(tmp); |
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} |
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static inline void chunkmemset_4(uint8_t *from, chunk_t *chunk) { |
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int32_t tmp; |
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memcpy(&tmp, from, sizeof(tmp)); |
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*chunk = _mm_set1_epi32(tmp); |
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} |
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static inline void chunkmemset_8(uint8_t *from, chunk_t *chunk) { |
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int64_t tmp; |
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memcpy(&tmp, from, sizeof(tmp)); |
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*chunk = _mm_set1_epi64x(tmp); |
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} |
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static inline void loadchunk(uint8_t const *s, chunk_t *chunk) { |
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*chunk = _mm_loadu_si128((__m128i *)s); |
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} |
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static inline void storechunk(uint8_t *out, chunk_t *chunk) { |
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_mm_storeu_si128((__m128i *)out, *chunk); |
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} |
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static inline chunk_t GET_CHUNK_MAG(uint8_t *buf, uint32_t *chunk_rem, uint32_t dist) { |
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lut_rem_pair lut_rem = perm_idx_lut[dist - 3]; |
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__m128i perm_vec, ret_vec; |
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/* Important to note: |
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* This is _not_ to subvert the memory sanitizer but to instead unpoison some |
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* bytes we willingly and purposefully load uninitialized that we swizzle over |
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* in a vector register, anyway. If what we assume is wrong about what is used, |
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* the memory sanitizer will still usefully flag it */ |
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__msan_unpoison(buf + dist, 16 - dist); |
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ret_vec = _mm_loadu_si128((__m128i*)buf); |
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*chunk_rem = lut_rem.remval; |
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perm_vec = _mm_load_si128((__m128i*)(permute_table + lut_rem.idx)); |
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ret_vec = _mm_shuffle_epi8(ret_vec, perm_vec); |
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return ret_vec; |
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} |
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extern uint8_t* chunkcopy_sse2(uint8_t *out, uint8_t const *from, unsigned len); |
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extern uint8_t* chunkunroll_sse2(uint8_t *out, unsigned *dist, unsigned *len); |
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#define CHUNKSIZE chunksize_ssse3 |
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#define CHUNKMEMSET chunkmemset_ssse3 |
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#define CHUNKMEMSET_SAFE chunkmemset_safe_ssse3 |
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#define CHUNKCOPY chunkcopy_sse2 |
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#define CHUNKUNROLL chunkunroll_sse2 |
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#include "chunkset_tpl.h" |
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#define INFLATE_FAST inflate_fast_ssse3 |
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#include "inffast_tpl.h" |
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#endif
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