52 lines
1.7 KiB
C
52 lines
1.7 KiB
C
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/*
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* Copyright (c) 2018, Alliance for Open Media. All rights reserved
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*
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* This source code is subject to the terms of the BSD 2 Clause License and
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* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
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* was not distributed with this source code in the LICENSE file, you can
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* obtain it at www.aomedia.org/license/software. If the Alliance for Open
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* Media Patent License 1.0 was not distributed with this source code in the
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* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
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*/
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#include <stdint.h>
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#include <smmintrin.h>
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// Byte-boundary alignment issues
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#define ALIGN_SIZE 8
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#define ALIGN_MASK (ALIGN_SIZE - 1)
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#define CALC_CRC(op, crc, type, buf, len) \
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while ((len) >= sizeof(type)) { \
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(crc) = op((crc), *(type *)(buf)); \
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(len) -= sizeof(type); \
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buf += sizeof(type); \
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}
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/**
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* Calculates 32-bit CRC for the input buffer
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* polynomial is 0x11EDC6F41
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* @return A 32-bit unsigned integer representing the CRC
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*/
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uint32_t av1_get_crc32c_value_sse4_2(void *crc_calculator, uint8_t *p,
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size_t len) {
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(void)crc_calculator;
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const uint8_t *buf = p;
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uint32_t crc = 0xFFFFFFFF;
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// Align the input to the word boundary
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for (; (len > 0) && ((intptr_t)buf & ALIGN_MASK); len--, buf++) {
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crc = _mm_crc32_u8(crc, *buf);
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}
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#ifdef __x86_64__
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uint64_t crc64 = crc;
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CALC_CRC(_mm_crc32_u64, crc64, uint64_t, buf, len)
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crc = (uint32_t)crc64;
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#endif
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CALC_CRC(_mm_crc32_u32, crc, uint32_t, buf, len)
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CALC_CRC(_mm_crc32_u16, crc, uint16_t, buf, len)
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CALC_CRC(_mm_crc32_u8, crc, uint8_t, buf, len)
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return (crc ^ 0xFFFFFFFF);
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}
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