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/* crc32_la.c - LoongArch version of crc32
* Copyright (C) 2025 Vladislav Shchapov <vladislav@shchapov.ru>
* For conditions of distribution and use, see copyright notice in zlib.h
*/
#ifdef LOONGARCH_CRC
#include "zbuild.h"
#include <larchintrin.h>
Z_INTERNAL uint32_t crc32_loongarch64(uint32_t crc, const uint8_t *buf, size_t len) {
uint32_t c = ~crc;
if (UNLIKELY(len == 1)) {
c = (uint32_t)__crc_w_b_w((char)(*buf), (int)c);
c = ~c;
return c;
}
uintptr_t align_diff = ALIGN_DIFF(buf, 8);
if (align_diff) {
if (len && (align_diff & 1)) {
c = (uint32_t)__crc_w_b_w((char)(*buf++), (int)c);
len--;
}
if (len >= 2 && (align_diff & 2)) {
c = (uint32_t)__crc_w_h_w((short)*((uint16_t*)buf), (int)c);
buf += 2;
len -= 2;
}
if (len >= 4 && (align_diff & 4)) {
c = (uint32_t)__crc_w_w_w((int)*((uint32_t*)buf), (int)c);
len -= 4;
buf += 4;
}
}
while (len >= 8) {
c = (uint32_t)__crc_w_d_w((long int)*((uint64_t*)buf), (int)c);
len -= 8;
buf += 8;
}
if (len & 4) {
c = (uint32_t)__crc_w_w_w((int)*((uint32_t*)buf), (int)c);
buf += 4;
}
if (len & 2) {
c = (uint32_t)__crc_w_h_w((short)*((uint16_t*)buf), (int)c);
buf += 2;
}
if (len & 1) {
c = (uint32_t)__crc_w_b_w((char)(*buf), (int)c);
}
c = ~c;
return c;
}
Z_INTERNAL uint32_t crc32_copy_loongarch64(uint32_t crc, uint8_t *dst, const uint8_t *src, size_t len) {
crc = crc32_loongarch64(crc, src, len);
memcpy(dst, src, len);
return crc;
}
#endif
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