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/* crc32_acle.c -- compute the CRC-32 of a data stream
* Copyright (C) 1995-2006, 2010, 2011, 2012 Mark Adler
* Copyright (C) 2016 Yang Zhang
* For conditions of distribution and use, see copyright notice in zlib.h
*
*/
#ifdef ARM_ACLE
#include "acle_intrins.h"
#include "zbuild.h"
Z_INTERNAL Z_TARGET_CRC uint32_t crc32_acle(uint32_t crc, const uint8_t *buf, size_t len) {
Z_REGISTER uint32_t c;
Z_REGISTER uint16_t buf2;
Z_REGISTER uint32_t buf4;
Z_REGISTER uint64_t buf8;
c = ~crc;
if (UNLIKELY(len == 1)) {
c = __crc32b(c, *buf);
c = ~c;
return c;
}
if ((ptrdiff_t)buf & (sizeof(uint64_t) - 1)) {
if (len && ((ptrdiff_t)buf & 1)) {
c = __crc32b(c, *buf++);
len--;
}
if ((len >= sizeof(uint16_t)) && ((ptrdiff_t)buf & (sizeof(uint32_t) - 1))) {
buf2 = *((uint16_t*)buf);
c = __crc32h(c, buf2);
buf += sizeof(uint16_t);
len -= sizeof(uint16_t);
}
if ((len >= sizeof(uint32_t)) && ((ptrdiff_t)buf & (sizeof(uint64_t) - 1))) {
buf4 = *((uint32_t*)buf);
c = __crc32w(c, buf4);
len -= sizeof(uint32_t);
buf += sizeof(uint32_t);
}
}
while (len >= sizeof(uint64_t)) {
buf8 = *((uint64_t*)buf);
c = __crc32d(c, buf8);
len -= sizeof(uint64_t);
buf += sizeof(uint64_t);
}
if (len >= sizeof(uint32_t)) {
buf4 = *((uint32_t*)buf);
c = __crc32w(c, buf4);
len -= sizeof(uint32_t);
buf += sizeof(uint32_t);
}
if (len >= sizeof(uint16_t)) {
buf2 = *((uint16_t*)buf);
c = __crc32h(c, buf2);
len -= sizeof(uint16_t);
buf += sizeof(uint16_t);
}
if (len) {
c = __crc32b(c, *buf);
}
c = ~c;
return c;
}
#endif
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