mirror of
https://github.com/simdjson/simdjson
synced 2026-06-08 17:27:07 +00:00
Daniel Lemire
b1444b4dfb
* Mostly tiny changes, with one optimization to fallback for number parsing. * Missed an update.
34 lines
1.1 KiB
C++
34 lines
1.1 KiB
C++
#ifndef SIMDJSON_FALLBACK_NUMBERPARSING_H
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#define SIMDJSON_FALLBACK_NUMBERPARSING_H
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#ifdef JSON_TEST_NUMBERS // for unit testing
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void found_invalid_number(const uint8_t *buf);
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void found_integer(int64_t result, const uint8_t *buf);
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void found_unsigned_integer(uint64_t result, const uint8_t *buf);
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void found_float(double result, const uint8_t *buf);
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#endif
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namespace simdjson {
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namespace SIMDJSON_IMPLEMENTATION {
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namespace {
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// credit: https://johnnylee-sde.github.io/Fast-numeric-string-to-int/
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static simdjson_really_inline uint32_t parse_eight_digits_unrolled(const char *chars) {
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uint64_t val;
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memcpy(&val, chars, sizeof(uint64_t));
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val = (val & 0x0F0F0F0F0F0F0F0F) * 2561 >> 8;
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val = (val & 0x00FF00FF00FF00FF) * 6553601 >> 16;
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return uint32_t((val & 0x0000FFFF0000FFFF) * 42949672960001 >> 32);
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}
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static simdjson_really_inline uint32_t parse_eight_digits_unrolled(const uint8_t *chars) {
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return parse_eight_digits_unrolled((const char *)chars);
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}
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} // unnamed namespace
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} // namespace SIMDJSON_IMPLEMENTATION
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} // namespace simdjson
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#define SWAR_NUMBER_PARSING
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#include "simdjson/generic/numberparsing.h"
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#endif // SIMDJSON_FALLBACK_NUMBERPARSING_H
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