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/*
* 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);
}
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