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SSE2 patches for encoding and decoding functions #302

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merged 4 commits into from
Apr 25, 2021
Merged

SSE2 patches for encoding and decoding functions #302

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77775c5
Use SSE2 in the x86_64 C version of decodeUtf8
ethercrow Oct 3, 2020
eaab373
Use SSE2 in the x86_64 C version of decodeLatin1
ethercrow Sep 21, 2020
0ad0820
Use SSE2 in the x86_64 C version of encodeUtf8
ethercrow Oct 7, 2020
d94d2ef
Update cbits/cbits.c
ethercrow Apr 20, 2021
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52 changes: 37 additions & 15 deletions cbits/cbits.c
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Original file line number Diff line number Diff line change
Expand Up @@ -9,8 +9,14 @@
#include <string.h>
#include <stdint.h>
#include <stdio.h>
#if defined(__x86_64__)
#include <emmintrin.h>
#include <xmmintrin.h>
#endif

#include "text_cbits.h"


void _hs_text_memcpy(void *dest, size_t doff, const void *src, size_t soff,
size_t n)
{
Expand Down Expand Up @@ -157,24 +163,40 @@ _hs_text_decode_utf8_int(uint16_t *const dest, size_t *destoff,
*/

if (state == UTF8_ACCEPT) {
#if defined(__x86_64__)
const __m128i zeros = _mm_set1_epi32(0);
while (s < srcend - 8) {
const uint64_t hopefully_eight_ascii_chars = *((uint64_t *) s);
if ((hopefully_eight_ascii_chars & 0x8080808080808080LL) != 0LL)
break;
s += 8;

/* Load 8 bytes of ASCII data */
const __m128i eight_ascii_chars = _mm_cvtsi64_si128(hopefully_eight_ascii_chars);
/* Interleave with zeros */
const __m128i eight_utf16_chars = _mm_unpacklo_epi8(eight_ascii_chars, zeros);
/* Store the resulting 8 bytes into destination */
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_mm_storeu_si128((__m128i *)d, eight_utf16_chars);
d += 8;
}
#else
while (s < srcend - 4) {
codepoint = *((uint32_t *) s);
if ((codepoint & 0x80808080) != 0)
break;
s += 4;

/*
* Tried 32-bit stores here, but the extra bit-twiddling
* slowed the code down.
*/

*d++ = (uint16_t) (codepoint & 0xff);
*d++ = (uint16_t) ((codepoint >> 8) & 0xff);
*d++ = (uint16_t) ((codepoint >> 16) & 0xff);
*d++ = (uint16_t) ((codepoint >> 24) & 0xff);
codepoint = *((uint32_t *) s);
if ((codepoint & 0x80808080) != 0)
break;
s += 4;
/*
* Tried 32-bit stores here, but the extra bit-twiddling
* slowed the code down.
*/
*d++ = (uint16_t) (codepoint & 0xff);
*d++ = (uint16_t) ((codepoint >> 8) & 0xff);
*d++ = (uint16_t) ((codepoint >> 16) & 0xff);
*d++ = (uint16_t) ((codepoint >> 24) & 0xff);
}
#endif
last = s;
}
} /* end if (state == UTF8_ACCEPT) */
#endif

if (decode(&state, &codepoint, *s++) != UTF8_ACCEPT) {
Expand Down