hash_sse42.c (1730B)
1 /* 2 * Copyright (c) 2018, Alliance for Open Media. All rights reserved. 3 * 4 * This source code is subject to the terms of the BSD 2 Clause License and 5 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License 6 * was not distributed with this source code in the LICENSE file, you can 7 * obtain it at www.aomedia.org/license/software. If the Alliance for Open 8 * Media Patent License 1.0 was not distributed with this source code in the 9 * PATENTS file, you can obtain it at www.aomedia.org/license/patent. 10 */ 11 12 #include <stdint.h> 13 #include <smmintrin.h> 14 15 #include "config/av1_rtcd.h" 16 17 // Byte-boundary alignment issues 18 #define ALIGN_SIZE 8 19 #define ALIGN_MASK (ALIGN_SIZE - 1) 20 21 #define CALC_CRC(op, crc, type, buf, len) \ 22 while ((len) >= sizeof(type)) { \ 23 (crc) = op((crc), *(type *)(buf)); \ 24 (len) -= sizeof(type); \ 25 buf += sizeof(type); \ 26 } 27 28 /** 29 * Calculates 32-bit CRC for the input buffer 30 * polynomial is 0x11EDC6F41 31 * @return A 32-bit unsigned integer representing the CRC 32 */ 33 uint32_t av1_get_crc32c_value_sse4_2(void *crc_calculator, const uint8_t *p, 34 size_t len) { 35 (void)crc_calculator; 36 const uint8_t *buf = p; 37 uint32_t crc = 0xFFFFFFFF; 38 39 // Align the input to the word boundary 40 for (; (len > 0) && ((intptr_t)buf & ALIGN_MASK); len--, buf++) { 41 crc = _mm_crc32_u8(crc, *buf); 42 } 43 44 #ifdef __x86_64__ 45 uint64_t crc64 = crc; 46 CALC_CRC(_mm_crc32_u64, crc64, uint64_t, buf, len) 47 crc = (uint32_t)crc64; 48 #endif 49 CALC_CRC(_mm_crc32_u32, crc, uint32_t, buf, len) 50 CALC_CRC(_mm_crc32_u16, crc, uint16_t, buf, len) 51 CALC_CRC(_mm_crc32_u8, crc, uint8_t, buf, len) 52 return (crc ^ 0xFFFFFFFF); 53 }