114 lines · cpp
1//===-- Unittests for str_to_float<double> --------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#include "src/__support/macros/config.h"10#include "str_to_fp_test.h"11 12namespace LIBC_NAMESPACE_DECL {13using LlvmLibcStrToDblTest = LlvmLibcStrToFloatTest<double>;14 15TEST_F(LlvmLibcStrToDblTest, ClingerFastPathFloat64Simple) {16 clinger_fast_path_test(123, 0, 0x1EC00000000000, 1029);17 clinger_fast_path_test(1234567890123456, 1, 0x15ee2a2eb5a5c0, 1076);18 clinger_fast_path_test(1234567890, -10, 0x1f9add3739635f, 1019);19}20 21TEST_F(LlvmLibcStrToDblTest, ClingerFastPathFloat64ExtendedExp) {22 clinger_fast_path_test(1, 30, 0x193e5939a08cea, 1122);23 clinger_fast_path_test(1, 37, 0x1e17b84357691b, 1145);24 clinger_fast_path_fails_test(10, 37);25 clinger_fast_path_fails_test(1, 100);26}27 28TEST_F(LlvmLibcStrToDblTest, ClingerFastPathFloat64NegativeExp) {29 clinger_fast_path_test(1, -10, 0x1b7cdfd9d7bdbb, 989);30 clinger_fast_path_test(1, -20, 0x179ca10c924223, 956);31 clinger_fast_path_fails_test(1, -25);32}33 34TEST_F(LlvmLibcStrToDblTest, EiselLemireFloat64Simple) {35 eisel_lemire_test(12345678901234567890u, 1, 0x1AC53A7E04BCDA, 1089);36 eisel_lemire_test(123, 0, 0x1EC00000000000, 1029);37 eisel_lemire_test(12345678901234568192u, 0, 0x156A95319D63E2, 1086);38}39 40TEST_F(LlvmLibcStrToDblTest, EiselLemireFloat64SpecificFailures) {41 // These test cases have caused failures in the past.42 eisel_lemire_test(358416272, -33, 0x1BBB2A68C9D0B9, 941);43 eisel_lemire_test(2166568064000000238u, -9, 0x10246690000000, 1054);44 eisel_lemire_test(2794967654709307187u, 1, 0x183e132bc608c8, 1087);45 eisel_lemire_test(2794967654709307188u, 1, 0x183e132bc608c9, 1087);46}47 48// Check the fallback states for the algorithm:49TEST_F(LlvmLibcStrToDblTest, EiselLemireFallbackStates) {50 // This number can't be evaluated by Eisel-Lemire since it's exactly 1024 away51 // from both of its closest floating point approximations52 // (12345678901234548736 and 12345678901234550784)53 ASSERT_FALSE(54 internal::eisel_lemire<double>({12345678901234549760u, 0}).has_value());55}56 57TEST_F(LlvmLibcStrToDblTest, SimpleDecimalConversion64BasicWholeNumbers) {58 simple_decimal_conversion_test("123456789012345678900", 0x1AC53A7E04BCDA,59 1089);60 simple_decimal_conversion_test("123", 0x1EC00000000000, 1029);61 simple_decimal_conversion_test("12345678901234549760", 0x156A95319D63D8,62 1086);63}64 65TEST_F(LlvmLibcStrToDblTest, SimpleDecimalConversion64BasicDecimals) {66 simple_decimal_conversion_test("1.2345", 0x13c083126e978d, 1023);67 simple_decimal_conversion_test(".2345", 0x1e04189374bc6a, 1020);68 simple_decimal_conversion_test(".299792458", 0x132fccb4aca314, 1021);69}70 71TEST_F(LlvmLibcStrToDblTest, SimpleDecimalConversion64BasicExponents) {72 simple_decimal_conversion_test("1e10", 0x12a05f20000000, 1056);73 simple_decimal_conversion_test("1e-10", 0x1b7cdfd9d7bdbb, 989);74 simple_decimal_conversion_test("1e300", 0x17e43c8800759c, 2019);75 simple_decimal_conversion_test("1e-300", 0x156e1fc2f8f359, 26);76}77 78TEST_F(LlvmLibcStrToDblTest, SimpleDecimalConversion64BasicSubnormals) {79 simple_decimal_conversion_test("1e-320", 0x7e8, 0, ERANGE);80 simple_decimal_conversion_test("1e-308", 0x730d67819e8d2, 0, ERANGE);81 simple_decimal_conversion_test("2.9e-308", 0x14da6df5e4bcc8, 1);82}83 84TEST_F(LlvmLibcStrToDblTest, SimpleDecimalConversion64SubnormalRounding) {85 86 // Technically you can keep adding digits until you hit the truncation limit,87 // but this is the shortest string that results in the maximum subnormal that88 // I found.89 simple_decimal_conversion_test("2.225073858507201e-308", 0xfffffffffffff, 0,90 ERANGE);91 92 // Same here, if you were to extend the max subnormal out for another 80093 // digits, incrementing any one of those digits would create a normal number.94 simple_decimal_conversion_test("2.2250738585072012e-308", 0x10000000000000,95 1);96}97 98TEST(LlvmLibcStrToDblTest, SimpleDecimalConversionExtraTypes) {99 uint64_t double_output_mantissa = 0;100 uint32_t output_exp2 = 0;101 102 auto double_result =103 internal::simple_decimal_conversion<double>("123456789012345678900");104 105 double_output_mantissa = double_result.num.mantissa;106 output_exp2 = static_cast<uint32_t>(double_result.num.exponent);107 108 EXPECT_EQ(double_output_mantissa, uint64_t(0x1AC53A7E04BCDA));109 EXPECT_EQ(output_exp2, uint32_t(1089));110 EXPECT_EQ(double_result.error, 0);111}112 113} // namespace LIBC_NAMESPACE_DECL114