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Diffstat (limited to '')
-rw-r--r-- | third_party/aom/av1/encoder/arm/crc32/hash_arm_crc32.c | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/third_party/aom/av1/encoder/arm/crc32/hash_arm_crc32.c b/third_party/aom/av1/encoder/arm/crc32/hash_arm_crc32.c new file mode 100644 index 0000000000..91fc1e00a5 --- /dev/null +++ b/third_party/aom/av1/encoder/arm/crc32/hash_arm_crc32.c @@ -0,0 +1,61 @@ +/* + * Copyright (c) 2022, 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. + */ + +#if defined(_MSC_VER) && !defined(__clang__) +#include <intrin.h> +#else +#include <arm_acle.h> +#endif + +#include <stddef.h> +#include <stdint.h> + +#include "config/aom_config.h" + +#define CRC_LOOP(op, crc, type, buf, len) \ + while ((len) >= sizeof(type)) { \ + (crc) = op((crc), *(type *)(buf)); \ + (len) -= sizeof(type); \ + buf += sizeof(type); \ + } + +#define CRC_SINGLE(op, crc, type, buf, len) \ + if ((len) >= sizeof(type)) { \ + (crc) = op((crc), *(type *)(buf)); \ + (len) -= sizeof(type); \ + buf += sizeof(type); \ + } + +/* Return 32-bit CRC for the input buffer. + * Polynomial is 0x1EDC6F41. + */ + +uint32_t av1_get_crc32c_value_arm_crc32(void *crc_calculator, uint8_t *p, + size_t len) { + (void)crc_calculator; + const uint8_t *buf = p; + uint32_t crc = 0xFFFFFFFF; + +#if !AOM_ARCH_AARCH64 + // Align input to 8-byte boundary (only necessary for 32-bit builds.) + while (len && ((uintptr_t)buf & 7)) { + crc = __crc32cb(crc, *buf++); + len--; + } +#endif + + CRC_LOOP(__crc32cd, crc, uint64_t, buf, len) + CRC_SINGLE(__crc32cw, crc, uint32_t, buf, len) + CRC_SINGLE(__crc32ch, crc, uint16_t, buf, len) + CRC_SINGLE(__crc32cb, crc, uint8_t, buf, len) + + return ~crc; +} |