| /* |
| * Copyright (c) 2021, Alliance for Open Media. All rights reserved |
| * |
| * This source code is subject to the terms of the BSD 3-Clause Clear License |
| * and the Alliance for Open Media Patent License 1.0. If the BSD 3-Clause Clear |
| * License was not distributed with this source code in the LICENSE file, you |
| * can obtain it at aomedia.org/license/software-license/bsd-3-c-c/. If the |
| * Alliance for Open Media Patent License 1.0 was not distributed with this |
| * source code in the PATENTS file, you can obtain it at |
| * aomedia.org/license/patent-license/. |
| */ |
| |
| #include <stdint.h> |
| #include <smmintrin.h> |
| |
| // Byte-boundary alignment issues |
| #define ALIGN_SIZE 8 |
| #define ALIGN_MASK (ALIGN_SIZE - 1) |
| |
| #define CALC_CRC(op, crc, type, buf, len) \ |
| while ((len) >= sizeof(type)) { \ |
| (crc) = op((crc), *(type *)(buf)); \ |
| (len) -= sizeof(type); \ |
| buf += sizeof(type); \ |
| } |
| |
| /** |
| * Calculates 32-bit CRC for the input buffer |
| * polynomial is 0x11EDC6F41 |
| * @return A 32-bit unsigned integer representing the CRC |
| */ |
| uint32_t av1_get_crc32c_value_sse4_2(void *crc_calculator, uint8_t *p, |
| size_t len) { |
| (void)crc_calculator; |
| const uint8_t *buf = p; |
| uint32_t crc = 0xFFFFFFFF; |
| |
| // Align the input to the word boundary |
| for (; (len > 0) && ((intptr_t)buf & ALIGN_MASK); len--, buf++) { |
| crc = _mm_crc32_u8(crc, *buf); |
| } |
| |
| #ifdef __x86_64__ |
| uint64_t crc64 = crc; |
| CALC_CRC(_mm_crc32_u64, crc64, uint64_t, buf, len); |
| crc = (uint32_t)crc64; |
| #endif |
| CALC_CRC(_mm_crc32_u32, crc, uint32_t, buf, len); |
| CALC_CRC(_mm_crc32_u16, crc, uint16_t, buf, len); |
| CALC_CRC(_mm_crc32_u8, crc, uint8_t, buf, len); |
| return (crc ^ 0xFFFFFFFF); |
| } |