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// file included directly
size_t icelake_convert_utf32_to_latin1(const char32_t *buf, size_t len,
char *latin1_output) {
const char32_t *end = buf + len;
__m512i v_0xFF = _mm512_set1_epi32(0xff);
__m512i shufmask = _mm512_set_epi8(
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 60,
56, 52, 48, 44, 40, 36, 32, 28, 24, 20, 16, 12, 8, 4, 0);
while (end - buf >= 16) {
__m512i in = _mm512_loadu_si512((__m512i *)buf);
if (_mm512_cmpgt_epu32_mask(in, v_0xFF)) {
return 0;
}
_mm_storeu_si128(
(__m128i *)latin1_output,
_mm512_castsi512_si128(_mm512_permutexvar_epi8(shufmask, in)));
latin1_output += 16;
buf += 16;
}
if (buf < end) {
uint16_t mask = uint16_t((1 << (end - buf)) - 1);
__m512i in = _mm512_maskz_loadu_epi32(mask, buf);
if (_mm512_cmpgt_epu32_mask(in, v_0xFF)) {
return 0;
}
_mm_mask_storeu_epi8(
latin1_output, mask,
_mm512_castsi512_si128(_mm512_permutexvar_epi8(shufmask, in)));
}
return len;
}
std::pair<result, char *>
icelake_convert_utf32_to_latin1_with_errors(const char32_t *buf, size_t len,
char *latin1_output) {
const char32_t *end = buf + len;
const char32_t *start = buf;
__m512i v_0xFF = _mm512_set1_epi32(0xff);
__m512i shufmask = _mm512_set_epi8(
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 60,
56, 52, 48, 44, 40, 36, 32, 28, 24, 20, 16, 12, 8, 4, 0);
while (end - buf >= 16) {
__m512i in = _mm512_loadu_si512((__m512i *)buf);
if (_mm512_cmpgt_epu32_mask(in, v_0xFF)) {
while (uint32_t(*buf) <= 0xff) {
*latin1_output++ = uint8_t(*buf++);
}
return std::make_pair(result(error_code::TOO_LARGE, buf - start),
latin1_output);
}
_mm_storeu_si128(
(__m128i *)latin1_output,
_mm512_castsi512_si128(_mm512_permutexvar_epi8(shufmask, in)));
latin1_output += 16;
buf += 16;
}
if (buf < end) {
uint16_t mask = uint16_t((1 << (end - buf)) - 1);
__m512i in = _mm512_maskz_loadu_epi32(mask, buf);
if (_mm512_cmpgt_epu32_mask(in, v_0xFF)) {
while (uint32_t(*buf) <= 0xff) {
*latin1_output++ = uint8_t(*buf++);
}
return std::make_pair(result(error_code::TOO_LARGE, buf - start),
latin1_output);
}
_mm_mask_storeu_epi8(
latin1_output, mask,
_mm512_castsi512_si128(_mm512_permutexvar_epi8(shufmask, in)));
}
return std::make_pair(result(error_code::SUCCESS, len), latin1_output);
}
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