1 // SPDX-License-Identifier: 0BSD
2
3 ///////////////////////////////////////////////////////////////////////////////
4 //
5 /// \file crc32_loongarch.h
6 /// \brief CRC32 calculation with LoongArch optimization
7 //
8 // Authors: Xi Ruoyao
9 // Lasse Collin
10 //
11 ///////////////////////////////////////////////////////////////////////////////
12
13 #ifndef LZMA_CRC32_LOONGARCH_H
14 #define LZMA_CRC32_LOONGARCH_H
15
16 #include <larchintrin.h>
17
18
19 static uint32_t
crc32_arch_optimized(const uint8_t * buf,size_t size,uint32_t crc_unsigned)20 crc32_arch_optimized(const uint8_t *buf, size_t size, uint32_t crc_unsigned)
21 {
22 int32_t crc = (int32_t)~crc_unsigned;
23
24 if (size >= 8) {
25 const size_t align = (0 - (uintptr_t)buf) & 7;
26
27 if (align & 1)
28 crc = __crc_w_b_w((int8_t)*buf++, crc);
29
30 if (align & 2) {
31 crc = __crc_w_h_w((int16_t)aligned_read16le(buf), crc);
32 buf += 2;
33 }
34
35 if (align & 4) {
36 crc = __crc_w_w_w((int32_t)aligned_read32le(buf), crc);
37 buf += 4;
38 }
39
40 size -= align;
41
42 for (const uint8_t *limit = buf + (size & ~(size_t)7);
43 buf < limit; buf += 8)
44 crc = __crc_w_d_w((int64_t)aligned_read64le(buf), crc);
45
46 size &= 7;
47 }
48
49 if (size & 4) {
50 crc = __crc_w_w_w((int32_t)aligned_read32le(buf), crc);
51 buf += 4;
52 }
53
54 if (size & 2) {
55 crc = __crc_w_h_w((int16_t)aligned_read16le(buf), crc);
56 buf += 2;
57 }
58
59 if (size & 1)
60 crc = __crc_w_b_w((int8_t)*buf, crc);
61
62 return (uint32_t)~crc;
63 }
64
65 #endif // LZMA_CRC32_LOONGARCH_H
66