1 /* crc32_simd.h 2 * 3 * Copyright 2017 The Chromium Authors 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the Chromium source repository LICENSE file. 6 */ 7 8 #include <stdint.h> 9 10 #include "zconf.h" 11 #include "zutil.h" 12 #include "deflate.h" 13 14 /* 15 * crc32_sse42_simd_(): compute the crc32 of the buffer, where the buffer 16 * length must be at least 64, and a multiple of 16. 17 */ 18 uint32_t ZLIB_INTERNAL crc32_sse42_simd_(const unsigned char* buf, 19 z_size_t len, 20 uint32_t crc); 21 22 /* 23 * crc32_sse42_simd_ buffer size constraints: see the use in zlib/crc32.c 24 * for computing the crc32 of an arbitrary length buffer. 25 */ 26 #define Z_CRC32_SSE42_MINIMUM_LENGTH 64 27 #define Z_CRC32_SSE42_CHUNKSIZE_MASK 15 28 29 /* 30 * CRC32 checksums using ARMv8-a crypto instructions. 31 */ 32 uint32_t ZLIB_INTERNAL armv8_crc32_little(const unsigned char* buf, 33 z_size_t len, 34 uint32_t crc); 35 36 /* aarch64 specific code. */ 37 #if defined(__aarch64__) 38 39 /* 128 is the sweet spot at the time of coding (late 2020). */ 40 #define Z_CRC32_PMULL_MINIMUM_LENGTH 128 41 #define Z_CRC32_PMULL_CHUNKSIZE_MASK 15 42 43 /* 44 * CRC32 checksums using ARMv8-a PMULL instructions, where the buffer 45 * length must be at least 64, and a multiple of 16. 46 */ 47 uint32_t ZLIB_INTERNAL armv8_crc32_pmull_little(const unsigned char* buf, 48 z_size_t len, 49 uint32_t crc); 50 51 #endif 52