| /* |
| * Copyright (c) 2018, Alliance for Open Media. All rights reserved |
| * |
| * This source code is subject to the terms of the BSD 2 Clause License and |
| * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License |
| * was not distributed with this source code in the LICENSE file, you can |
| * obtain it at www.aomedia.org/license/software. 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 www.aomedia.org/license/patent. |
| */ |
| |
| #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); |
| } |