mirror of
https://github.com/simdjson/simdjson
synced 2026-06-08 17:27:07 +00:00
Javier Blazquez
60 lines
2.1 KiB
C++
60 lines
2.1 KiB
C++
#ifndef SIMDJSON_WESTMERE_NUMBERPARSING_DEFS_H
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#define SIMDJSON_WESTMERE_NUMBERPARSING_DEFS_H
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#include "simdjson/westmere/base.h"
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#include "simdjson/westmere/intrinsics.h"
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#ifndef SIMDJSON_CONDITIONAL_INCLUDE
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#include "simdjson/internal/numberparsing_tables.h"
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#endif // SIMDJSON_CONDITIONAL_INCLUDE
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namespace simdjson {
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namespace westmere {
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namespace numberparsing {
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/** @private */
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static simdjson_inline uint32_t parse_eight_digits_unrolled(const uint8_t *chars) {
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// this actually computes *16* values so we are being wasteful.
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const __m128i ascii0 = _mm_set1_epi8('0');
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const __m128i mul_1_10 =
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_mm_setr_epi8(10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1);
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const __m128i mul_1_100 = _mm_setr_epi16(100, 1, 100, 1, 100, 1, 100, 1);
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const __m128i mul_1_10000 =
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_mm_setr_epi16(10000, 1, 10000, 1, 10000, 1, 10000, 1);
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const __m128i input = _mm_sub_epi8(
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_mm_loadu_si128(reinterpret_cast<const __m128i *>(chars)), ascii0);
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const __m128i t1 = _mm_maddubs_epi16(input, mul_1_10);
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const __m128i t2 = _mm_madd_epi16(t1, mul_1_100);
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const __m128i t3 = _mm_packus_epi32(t2, t2);
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const __m128i t4 = _mm_madd_epi16(t3, mul_1_10000);
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return _mm_cvtsi128_si32(
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t4); // only captures the sum of the first 8 digits, drop the rest
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}
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/** @private */
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simdjson_inline internal::value128 full_multiplication(uint64_t value1, uint64_t value2) {
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internal::value128 answer;
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#if SIMDJSON_REGULAR_VISUAL_STUDIO || SIMDJSON_IS_32BITS
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#if SIMDJSON_IS_ARM64
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// ARM64 has native support for 64-bit multiplications, no need to emultate
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answer.high = __umulh(value1, value2);
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answer.low = value1 * value2;
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#else
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answer.low = _umul128(value1, value2, &answer.high); // _umul128 not available on ARM64
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#endif // SIMDJSON_IS_ARM64
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#else // SIMDJSON_REGULAR_VISUAL_STUDIO || SIMDJSON_IS_32BITS
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__uint128_t r = (static_cast<__uint128_t>(value1)) * value2;
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answer.low = uint64_t(r);
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answer.high = uint64_t(r >> 64);
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#endif
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return answer;
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}
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} // namespace numberparsing
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} // namespace westmere
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} // namespace simdjson
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#define SIMDJSON_SWAR_NUMBER_PARSING 1
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#endif // SIMDJSON_WESTMERE_NUMBERPARSING_DEFS_H
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