#ifndef SIMDJSON_HASWELL_NUMBERPARSING_H

#define SIMDJSON_HASWELL_NUMBERPARSING_H

namespace simdjson {

namespace SIMDJSON_IMPLEMENTATION {

namespace {

static simdjson_inline uint32_t parse_eight_digits_unrolled(const uint8_t *chars) {

  // this actually computes *16* values so we are being wasteful.

  const __m128i ascii0 = _mm_set1_epi8('0');

  const __m128i mul_1_10 =

      _mm_setr_epi8(10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1);

  const __m128i mul_1_100 = _mm_setr_epi16(100, 1, 100, 1, 100, 1, 100, 1);

  const __m128i mul_1_10000 =

      _mm_setr_epi16(10000, 1, 10000, 1, 10000, 1, 10000, 1);

  const __m128i input = _mm_sub_epi8(

      _mm_loadu_si128(reinterpret_cast<const __m128i *>(chars)), ascii0);

  const __m128i t1 = _mm_maddubs_epi16(input, mul_1_10);

  const __m128i t2 = _mm_madd_epi16(t1, mul_1_100);

  const __m128i t3 = _mm_packus_epi32(t2, t2);

  const __m128i t4 = _mm_madd_epi16(t3, mul_1_10000);

  return _mm_cvtsi128_si32(

      t4); // only captures the sum of the first 8 digits, drop the rest

}

Unexecuted instantiation: fuzz_ndjson.cpp:simdjson::haswell::(anonymous namespace)::parse_eight_digits_unrolled(unsigned char const*)

simdjson.cpp:simdjson::haswell::(anonymous namespace)::parse_eight_digits_unrolled(unsigned char const*)

Line

Count

Source

8

9.48k

static simdjson_inline uint32_t parse_eight_digits_unrolled(const uint8_t *chars) {

9

  // this actually computes *16* values so we are being wasteful.

10

9.48k

  const __m128i ascii0 = _mm_set1_epi8('0');

11

9.48k

  const __m128i mul_1_10 =

12

9.48k

      _mm_setr_epi8(10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1);

13

9.48k

  const __m128i mul_1_100 = _mm_setr_epi16(100, 1, 100, 1, 100, 1, 100, 1);

14

9.48k

  const __m128i mul_1_10000 =

15

9.48k

      _mm_setr_epi16(10000, 1, 10000, 1, 10000, 1, 10000, 1);

16

9.48k

  const __m128i input = _mm_sub_epi8(

17

9.48k

      _mm_loadu_si128(reinterpret_cast<const __m128i *>(chars)), ascii0);

18

9.48k

  const __m128i t1 = _mm_maddubs_epi16(input, mul_1_10);

19

9.48k

  const __m128i t2 = _mm_madd_epi16(t1, mul_1_100);

20

9.48k

  const __m128i t3 = _mm_packus_epi32(t2, t2);

21

9.48k

  const __m128i t4 = _mm_madd_epi16(t3, mul_1_10000);

22

9.48k

  return _mm_cvtsi128_si32(

23

9.48k

      t4); // only captures the sum of the first 8 digits, drop the rest

24

9.48k

}

} // unnamed namespace

} // namespace SIMDJSON_IMPLEMENTATION

} // namespace simdjson

#define SIMDJSON_SWAR_NUMBER_PARSING 1

#include "simdjson/generic/numberparsing.h"

#endif // SIMDJSON_HASWELL_NUMBERPARSING_H