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74 lines
1.6 KiB
C
74 lines
1.6 KiB
C
//
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// Created by claunia on 29/9/21.
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//
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#if defined(__aarch64__) || defined(_M_ARM64) || defined(__arm__) || defined(_M_ARM)
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#include <arm_acle.h>
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#include "library.h"
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#include "crc32.h"
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TARGET_ARMV8_WITH_CRC uint32_t armv8_crc32_little(uint32_t crc, const unsigned char* buf, uint32_t len)
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{
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uint32_t c = (uint32_t)crc;
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#if defined(__aarch64__) || defined(_M_ARM64)
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while(len && ((uintptr_t)buf & 7))
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{
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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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{
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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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{
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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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#else // AARCH64
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while(len && ((uintptr_t)buf & 3))
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{
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c = __crc32b(c, *buf++);
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--len;
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}
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const uint32_t* buf4 = (const uint32_t*)buf;
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while(len >= 32)
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{
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c = __crc32w(c, *buf4++);
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c = __crc32w(c, *buf4++);
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c = __crc32w(c, *buf4++);
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c = __crc32w(c, *buf4++);
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c = __crc32w(c, *buf4++);
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c = __crc32w(c, *buf4++);
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c = __crc32w(c, *buf4++);
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c = __crc32w(c, *buf4++);
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len -= 32;
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}
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while(len >= 4)
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{
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c = __crc32d(c, *buf4++);
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len -= 4;
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}
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buf = (const unsigned char*)buf4;
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#endif
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while(len--) { c = __crc32b(c, *buf++); }
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return c;
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}
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#endif
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