0545e9dc6d
commit d1edce71135cc6d98c0a4b5729774542b676e769 Author: sophgo-forum-service <forum_service@sophgo.com> Date: Fri Mar 15 16:07:33 2024 +0800 [fix] recommend using ssh method to clone repo. [fix] fix sensor driver repo branch name.
71 lines
1.5 KiB
C
71 lines
1.5 KiB
C
#include <stddef.h>
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#include <stdint.h>
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#pragma GCC push_options
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#pragma GCC target("+nothing+crc")
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#if !defined(__ARM_FEATURE_CRC32)
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#error "__ARM_FEATURE_CRC32"
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#endif
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static inline uint32_t __extension__ __attribute__((__always_inline__)) __crc32b(uint32_t __a, uint8_t __b)
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{
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return __builtin_aarch64_crc32b(__a, __b);
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}
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static inline uint32_t __extension__ __attribute__((__always_inline__)) __crc32d(uint32_t __a, uint64_t __b)
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{
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return __builtin_aarch64_crc32x(__a, __b);
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}
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/**
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* crc-32
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* Width 32
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* Poly 0x04c11db7
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* Reflect In True
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* XOR In 0xffffffff
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* Reflect Out True
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* XOR Out 0xffffffff
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* Short command pycrc.py --model crc-32
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* Extended command pycrc.py --width 32 --poly 0x04c11db7
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* --reflect-in True --xor-in 0xffffffff --reflect-out True --xor-out 0xffffffff
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* Check 0xcbf43926
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*/
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uint32_t armv8_crc32_little(unsigned long crc, const unsigned char *buf, size_t len)
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{
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uint32_t c = (uint32_t)~crc;
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while (len && ((uintptr_t)buf & 7)) {
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c = __crc32b(c, *buf++);
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--len;
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}
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const uint64_t *buf8 = (const uint64_t *)buf;
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while (len >= 64) {
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c = __crc32d(c, *buf8++);
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c = __crc32d(c, *buf8++);
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c = __crc32d(c, *buf8++);
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c = __crc32d(c, *buf8++);
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c = __crc32d(c, *buf8++);
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c = __crc32d(c, *buf8++);
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c = __crc32d(c, *buf8++);
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c = __crc32d(c, *buf8++);
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len -= 64;
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}
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while (len >= 8) {
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c = __crc32d(c, *buf8++);
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len -= 8;
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}
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buf = (const unsigned char *)buf8;
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while (len--) {
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c = __crc32b(c, *buf++);
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}
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return ~c;
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}
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#pragma GCC pop_options |