crc32_loongarch.h@ 109046

Last change on this file since 109046 was 108915, checked in by vboxsync, 6 weeks ago
libs/liblzma: Liblzma ose fix. jiraref:VBP-1635
File size: 1.3 KB

Line
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
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

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