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move crc32 SSE42 implementation to util/arch/x86

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This commit is contained in:
Konstantinos Margaritis
2020-09-18 12:48:14 +03:00
parent 6a40793719
commit ea721c908f
2 changed files with 83 additions and 48 deletions
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49
src/crc32.c
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@@ -30,7 +30,6 @@
#include "config.h"
#include "ue2common.h"
#include "util/arch.h"
#include "util/intrinsics.h"
#if !defined(HAVE_SSE42)
@@ -579,53 +578,7 @@ u32 crc32c_sb8_64_bit(u32 running_crc, const unsigned char* p_buf,
}
#else // HAVE_SSE42
#ifdef ARCH_64_BIT
#define CRC_WORD 8
#define CRC_TYPE u64a
#define CRC_FUNC _mm_crc32_u64
#else
#define CRC_WORD 4
#define CRC_TYPE u32
#define CRC_FUNC _mm_crc32_u32
#endif
/*
* Use the crc32 instruction from SSE4.2 to compute our checksum - same
* polynomial as the above function.
*/
static really_inline
u32 crc32c_sse42(u32 running_crc, const unsigned char* p_buf,
const size_t length) {
u32 crc = running_crc;
// Process byte-by-byte until p_buf is aligned
const unsigned char *aligned_buf = ROUNDUP_PTR(p_buf, CRC_WORD);
size_t init_bytes = aligned_buf - p_buf;
size_t running_length = ((length - init_bytes)/CRC_WORD)*CRC_WORD;
size_t end_bytes = length - init_bytes - running_length;
while (p_buf < aligned_buf) {
crc = _mm_crc32_u8(crc, *p_buf++);
}
// Main aligned loop, processes a word at a time.
for (size_t li = 0; li < running_length/CRC_WORD; li++) {
CRC_TYPE block = *(const CRC_TYPE *)p_buf;
crc = CRC_FUNC(crc, block);
p_buf += CRC_WORD;
}
// Remaining bytes
for(size_t li = 0; li < end_bytes; li++) {
crc = _mm_crc32_u8(crc, *p_buf++);
}
return crc;
}
#include "util/arch/x86/crc32.h"
#endif
#ifdef VERIFY_ASSERTION