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// file included directly
// File contains conversion procedure from possibly invalid UTF-8 strings.
/**
* Attempts to convert up to len 1-byte code units from in (in UTF-8 format) to
* out.
* Returns the position of the input and output after the processing is
* completed. Upon error, the output is set to null.
*/
template <endianness big_endian>
utf8_to_utf16_result
fast_avx512_convert_utf8_to_utf16(const char *in, size_t len, char16_t *out) {
const char *const final_in = in + len;
bool result = true;
while (result) {
if (final_in - in >= 64) {
result = process_block_utf8_to_utf16<SIMDUTF_FULL, big_endian>(
in, out, final_in - in);
} else if (in < final_in) {
result = process_block_utf8_to_utf16<SIMDUTF_TAIL, big_endian>(
in, out, final_in - in);
} else {
break;
}
}
if (!result) {
out = nullptr;
}
return std::make_pair(in, out);
}
template <endianness big_endian>
simdutf::result fast_avx512_convert_utf8_to_utf16_with_errors(const char *in,
size_t len,
char16_t *out) {
const char *const init_in = in;
const char16_t *const init_out = out;
const char *const final_in = in + len;
bool result = true;
while (result) {
if (final_in - in >= 64) {
result = process_block_utf8_to_utf16<SIMDUTF_FULL, big_endian>(
in, out, final_in - in);
} else if (in < final_in) {
result = process_block_utf8_to_utf16<SIMDUTF_TAIL, big_endian>(
in, out, final_in - in);
} else {
break;
}
}
if (!result) {
size_t pos = size_t(in - init_in);
if (pos < len && (init_in[pos] & 0xc0) == 0x80 && pos >= 64) {
// We must check whether we are the fourth continuation byte
bool c1 = (init_in[pos - 1] & 0xc0) == 0x80;
bool c2 = (init_in[pos - 2] & 0xc0) == 0x80;
bool c3 = (init_in[pos - 3] & 0xc0) == 0x80;
if (c1 && c2 && c3) {
return {simdutf::TOO_LONG, pos};
}
}
// rewind_and_convert_with_errors will seek a potential error from in
// onward, with the ability to go back up to in - init_in bytes, and read
// final_in - in bytes forward.
simdutf::result res =
scalar::utf8_to_utf16::rewind_and_convert_with_errors<big_endian>(
in - init_in, in, final_in - in, out);
res.count += (in - init_in);
return res;
} else {
return simdutf::result(error_code::SUCCESS, out - init_out);
}
}
template <endianness big_endian, typename OUTPUT>
// todo: replace with the utf-8 to utf-16 routine adapted to utf-32. This code
// is legacy.
std::pair<const char *, OUTPUT *>
validating_utf8_to_fixed_length(const char *str, size_t len, OUTPUT *dwords) {
constexpr bool UTF32 = std::is_same<OUTPUT, uint32_t>::value;
constexpr bool UTF16 = std::is_same<OUTPUT, char16_t>::value;
static_assert(
UTF32 or UTF16,
"output type has to be uint32_t (for UTF-32) or char16_t (for UTF-16)");
static_assert(!(UTF32 and big_endian),
"we do not currently support big-endian UTF-32");
const char *ptr = str;
const char *end = ptr + len;
__m512i byteflip = _mm512_setr_epi64(0x0607040502030001, 0x0e0f0c0d0a0b0809,
0x0607040502030001, 0x0e0f0c0d0a0b0809,
0x0607040502030001, 0x0e0f0c0d0a0b0809,
0x0607040502030001, 0x0e0f0c0d0a0b0809);
OUTPUT *output = dwords;
avx512_utf8_checker checker{};
/**
* In the main loop, we consume 64 bytes per iteration,
* but we access 64 + 4 bytes.
* We use masked writes to avoid overruns, see
* https://github.com/simdutf/simdutf/issues/471
*/
while (end - ptr >= 64 + 4) {
const __m512i utf8 = _mm512_loadu_si512((const __m512i *)ptr);
if (checker.check_next_input(utf8)) {
SIMDUTF_ICELAKE_STORE_ASCII(UTF32, utf8, output)
output += 64;
ptr += 64;
continue;
}
const __m512i lane0 = broadcast_epi128<0>(utf8);
const __m512i lane1 = broadcast_epi128<1>(utf8);
int valid_count0;
__m512i vec0 = expand_and_identify(lane0, lane1, valid_count0);
const __m512i lane2 = broadcast_epi128<2>(utf8);
int valid_count1;
__m512i vec1 = expand_and_identify(lane1, lane2, valid_count1);
if (valid_count0 + valid_count1 <= 16) {
vec0 = _mm512_mask_expand_epi32(
vec0, __mmask16(((1 << valid_count1) - 1) << valid_count0), vec1);
valid_count0 += valid_count1;
vec0 = expand_utf8_to_utf32(vec0);
SIMDUTF_ICELAKE_WRITE_UTF16_OR_UTF32(vec0, valid_count0, true)
} else {
vec0 = expand_utf8_to_utf32(vec0);
vec1 = expand_utf8_to_utf32(vec1);
SIMDUTF_ICELAKE_WRITE_UTF16_OR_UTF32(vec0, valid_count0, true)
SIMDUTF_ICELAKE_WRITE_UTF16_OR_UTF32(vec1, valid_count1, true)
}
const __m512i lane3 = broadcast_epi128<3>(utf8);
int valid_count2;
__m512i vec2 = expand_and_identify(lane2, lane3, valid_count2);
uint32_t tmp1;
::memcpy(&tmp1, ptr + 64, sizeof(tmp1));
const __m512i lane4 = _mm512_set1_epi32(tmp1);
int valid_count3;
__m512i vec3 = expand_and_identify(lane3, lane4, valid_count3);
if (valid_count2 + valid_count3 <= 16) {
vec2 = _mm512_mask_expand_epi32(
vec2, __mmask16(((1 << valid_count3) - 1) << valid_count2), vec3);
valid_count2 += valid_count3;
vec2 = expand_utf8_to_utf32(vec2);
SIMDUTF_ICELAKE_WRITE_UTF16_OR_UTF32(vec2, valid_count2, true)
} else {
vec2 = expand_utf8_to_utf32(vec2);
vec3 = expand_utf8_to_utf32(vec3);
SIMDUTF_ICELAKE_WRITE_UTF16_OR_UTF32(vec2, valid_count2, true)
SIMDUTF_ICELAKE_WRITE_UTF16_OR_UTF32(vec3, valid_count3, true)
}
ptr += 4 * 16;
}
const char *validatedptr = ptr; // validated up to ptr
// For the final pass, we validate 64 bytes, but we only transcode
// 3*16 bytes, so we may end up double-validating 16 bytes.
if (end - ptr >= 64) {
const __m512i utf8 = _mm512_loadu_si512((const __m512i *)ptr);
if (checker.check_next_input(utf8)) {
SIMDUTF_ICELAKE_STORE_ASCII(UTF32, utf8, output)
output += 64;
ptr += 64;
} else {
const __m512i lane0 = broadcast_epi128<0>(utf8);
const __m512i lane1 = broadcast_epi128<1>(utf8);
int valid_count0;
__m512i vec0 = expand_and_identify(lane0, lane1, valid_count0);
const __m512i lane2 = broadcast_epi128<2>(utf8);
int valid_count1;
__m512i vec1 = expand_and_identify(lane1, lane2, valid_count1);
if (valid_count0 + valid_count1 <= 16) {
vec0 = _mm512_mask_expand_epi32(
vec0, __mmask16(((1 << valid_count1) - 1) << valid_count0), vec1);
valid_count0 += valid_count1;
vec0 = expand_utf8_to_utf32(vec0);
SIMDUTF_ICELAKE_WRITE_UTF16_OR_UTF32(vec0, valid_count0, true)
} else {
vec0 = expand_utf8_to_utf32(vec0);
vec1 = expand_utf8_to_utf32(vec1);
SIMDUTF_ICELAKE_WRITE_UTF16_OR_UTF32(vec0, valid_count0, true)
SIMDUTF_ICELAKE_WRITE_UTF16_OR_UTF32(vec1, valid_count1, true)
}
const __m512i lane3 = broadcast_epi128<3>(utf8);
SIMDUTF_ICELAKE_TRANSCODE16(lane2, lane3, true)
ptr += 3 * 16;
}
validatedptr += 4 * 16;
}
if (end != validatedptr) {
const __m512i utf8 =
_mm512_maskz_loadu_epi8(~UINT64_C(0) >> (64 - (end - validatedptr)),
(const __m512i *)validatedptr);
checker.check_next_input(utf8);
}
checker.check_eof();
if (checker.errors()) {
return {ptr, nullptr}; // We found an error.
}
return {ptr, output};
}
// Like validating_utf8_to_fixed_length but returns as soon as an error is
// identified todo: replace with the utf-8 to utf-16 routine adapted to utf-32.
// This code is legacy.
template <endianness big_endian, typename OUTPUT>
std::tuple<const char *, OUTPUT *, bool>
validating_utf8_to_fixed_length_with_constant_checks(const char *str,
size_t len,
OUTPUT *dwords) {
constexpr bool UTF32 = std::is_same<OUTPUT, uint32_t>::value;
constexpr bool UTF16 = std::is_same<OUTPUT, char16_t>::value;
static_assert(
UTF32 or UTF16,
"output type has to be uint32_t (for UTF-32) or char16_t (for UTF-16)");
static_assert(!(UTF32 and big_endian),
"we do not currently support big-endian UTF-32");
const char *ptr = str;
const char *end = ptr + len;
__m512i byteflip = _mm512_setr_epi64(0x0607040502030001, 0x0e0f0c0d0a0b0809,
0x0607040502030001, 0x0e0f0c0d0a0b0809,
0x0607040502030001, 0x0e0f0c0d0a0b0809,
0x0607040502030001, 0x0e0f0c0d0a0b0809);
OUTPUT *output = dwords;
avx512_utf8_checker checker{};
/**
* In the main loop, we consume 64 bytes per iteration,
* but we access 64 + 4 bytes.
*/
while (end - ptr >= 4 + 64) {
const __m512i utf8 = _mm512_loadu_si512((const __m512i *)ptr);
bool ascii = checker.check_next_input(utf8);
if (checker.errors()) {
return {ptr, output, false}; // We found an error.
}
if (ascii) {
SIMDUTF_ICELAKE_STORE_ASCII(UTF32, utf8, output)
output += 64;
ptr += 64;
continue;
}
const __m512i lane0 = broadcast_epi128<0>(utf8);
const __m512i lane1 = broadcast_epi128<1>(utf8);
int valid_count0;
__m512i vec0 = expand_and_identify(lane0, lane1, valid_count0);
const __m512i lane2 = broadcast_epi128<2>(utf8);
int valid_count1;
__m512i vec1 = expand_and_identify(lane1, lane2, valid_count1);
if (valid_count0 + valid_count1 <= 16) {
vec0 = _mm512_mask_expand_epi32(
vec0, __mmask16(((1 << valid_count1) - 1) << valid_count0), vec1);
valid_count0 += valid_count1;
vec0 = expand_utf8_to_utf32(vec0);
SIMDUTF_ICELAKE_WRITE_UTF16_OR_UTF32(vec0, valid_count0, true)
} else {
vec0 = expand_utf8_to_utf32(vec0);
vec1 = expand_utf8_to_utf32(vec1);
SIMDUTF_ICELAKE_WRITE_UTF16_OR_UTF32(vec0, valid_count0, true)
SIMDUTF_ICELAKE_WRITE_UTF16_OR_UTF32(vec1, valid_count1, true)
}
const __m512i lane3 = broadcast_epi128<3>(utf8);
int valid_count2;
__m512i vec2 = expand_and_identify(lane2, lane3, valid_count2);
uint32_t tmp1;
::memcpy(&tmp1, ptr + 64, sizeof(tmp1));
const __m512i lane4 = _mm512_set1_epi32(tmp1);
int valid_count3;
__m512i vec3 = expand_and_identify(lane3, lane4, valid_count3);
if (valid_count2 + valid_count3 <= 16) {
vec2 = _mm512_mask_expand_epi32(
vec2, __mmask16(((1 << valid_count3) - 1) << valid_count2), vec3);
valid_count2 += valid_count3;
vec2 = expand_utf8_to_utf32(vec2);
SIMDUTF_ICELAKE_WRITE_UTF16_OR_UTF32(vec2, valid_count2, true)
} else {
vec2 = expand_utf8_to_utf32(vec2);
vec3 = expand_utf8_to_utf32(vec3);
SIMDUTF_ICELAKE_WRITE_UTF16_OR_UTF32(vec2, valid_count2, true)
SIMDUTF_ICELAKE_WRITE_UTF16_OR_UTF32(vec3, valid_count3, true)
}
ptr += 4 * 16;
}
const char *validatedptr = ptr; // validated up to ptr
// For the final pass, we validate 64 bytes, but we only transcode
// 3*16 bytes, so we may end up double-validating 16 bytes.
if (end - ptr >= 64) {
const __m512i utf8 = _mm512_loadu_si512((const __m512i *)ptr);
bool ascii = checker.check_next_input(utf8);
if (checker.errors()) {
return {ptr, output, false}; // We found an error.
}
if (ascii) {
SIMDUTF_ICELAKE_STORE_ASCII(UTF32, utf8, output)
output += 64;
ptr += 64;
} else {
const __m512i lane0 = broadcast_epi128<0>(utf8);
const __m512i lane1 = broadcast_epi128<1>(utf8);
int valid_count0;
__m512i vec0 = expand_and_identify(lane0, lane1, valid_count0);
const __m512i lane2 = broadcast_epi128<2>(utf8);
int valid_count1;
__m512i vec1 = expand_and_identify(lane1, lane2, valid_count1);
if (valid_count0 + valid_count1 <= 16) {
vec0 = _mm512_mask_expand_epi32(
vec0, __mmask16(((1 << valid_count1) - 1) << valid_count0), vec1);
valid_count0 += valid_count1;
vec0 = expand_utf8_to_utf32(vec0);
SIMDUTF_ICELAKE_WRITE_UTF16_OR_UTF32(vec0, valid_count0, true)
} else {
vec0 = expand_utf8_to_utf32(vec0);
vec1 = expand_utf8_to_utf32(vec1);
SIMDUTF_ICELAKE_WRITE_UTF16_OR_UTF32(vec0, valid_count0, true)
SIMDUTF_ICELAKE_WRITE_UTF16_OR_UTF32(vec1, valid_count1, true)
}
const __m512i lane3 = broadcast_epi128<3>(utf8);
SIMDUTF_ICELAKE_TRANSCODE16(lane2, lane3, true)
ptr += 3 * 16;
}
validatedptr += 4 * 16;
}
if (end != validatedptr) {
const __m512i utf8 =
_mm512_maskz_loadu_epi8(~UINT64_C(0) >> (64 - (end - validatedptr)),
(const __m512i *)validatedptr);
checker.check_next_input(utf8);
}
checker.check_eof();
if (checker.errors()) {
return {ptr, output, false}; // We found an error.
}
return {ptr, output, true};
}
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