| // Copyright (c) 2015 The Khronos Group Inc. |
| // |
| // Permission is hereby granted, free of charge, to any person obtaining a |
| // copy of this software and/or associated documentation files (the |
| // "Materials"), to deal in the Materials without restriction, including |
| // without limitation the rights to use, copy, modify, merge, publish, |
| // distribute, sublicense, and/or sell copies of the Materials, and to |
| // permit persons to whom the Materials are furnished to do so, subject to |
| // the following conditions: |
| // |
| // The above copyright notice and this permission notice shall be included |
| // in all copies or substantial portions of the Materials. |
| // |
| // MODIFICATIONS TO THIS FILE MAY MEAN IT NO LONGER ACCURATELY REFLECTS |
| // KHRONOS STANDARDS. THE UNMODIFIED, NORMATIVE VERSIONS OF KHRONOS |
| // SPECIFICATIONS AND HEADER INFORMATION ARE LOCATED AT |
| // https://www.khronos.org/registry/ |
| // |
| // THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
| // IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY |
| // CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
| // TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
| // MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS. |
| |
| #ifdef _MSC_VER |
| // We define this so that we can use sscanf in the tests without |
| // MSVC warning us all the time. |
| #define _CRT_SECURE_NO_WARNINGS |
| #endif |
| |
| #include <cmath> |
| #include <cstdio> |
| #include <sstream> |
| #include <string> |
| #include <tuple> |
| |
| #include <gmock/gmock.h> |
| #include "UnitSPIRV.h" |
| #include "util/hex_float.h" |
| |
| namespace { |
| using ::testing::Eq; |
| using spvutils::BitwiseCast; |
| using spvutils::FloatProxy; |
| |
| // In this file "encode" means converting a number into a string, |
| // and "decode" means converting a string into a number. |
| |
| using HexFloatTest = |
| ::testing::TestWithParam<std::pair<FloatProxy<float>, std::string>>; |
| using DecodeHexFloatTest = |
| ::testing::TestWithParam<std::pair<std::string, FloatProxy<float>>>; |
| using HexDoubleTest = |
| ::testing::TestWithParam<std::pair<FloatProxy<double>, std::string>>; |
| using DecodeHexDoubleTest = |
| ::testing::TestWithParam<std::pair<std::string, FloatProxy<double>>>; |
| |
| // Hex-encodes a float value. |
| template <typename T> |
| std::string EncodeViaHexFloat(const T& value) { |
| std::stringstream ss; |
| ss << spvutils::HexFloat<T>(value); |
| return ss.str(); |
| } |
| |
| // The following two tests can't be DRY because they take different parameter |
| // types. |
| |
| TEST_P(HexFloatTest, EncodeCorrectly) { |
| EXPECT_THAT(EncodeViaHexFloat(GetParam().first), Eq(GetParam().second)); |
| } |
| |
| TEST_P(HexDoubleTest, EncodeCorrectly) { |
| EXPECT_THAT(EncodeViaHexFloat(GetParam().first), Eq(GetParam().second)); |
| } |
| |
| // Decodes a hex-float string. |
| template <typename T> |
| FloatProxy<T> Decode(const std::string& str) { |
| spvutils::HexFloat<FloatProxy<T>> decoded(0.f); |
| EXPECT_TRUE((std::stringstream(str) >> decoded).eof()); |
| return decoded.value(); |
| } |
| |
| TEST_P(HexFloatTest, DecodeCorrectly) { |
| EXPECT_THAT(Decode<float>(GetParam().second), Eq(GetParam().first)); |
| } |
| |
| TEST_P(HexDoubleTest, DecodeCorrectly) { |
| EXPECT_THAT(Decode<double>(GetParam().second), Eq(GetParam().first)); |
| } |
| |
| INSTANTIATE_TEST_CASE_P( |
| Float32Tests, HexFloatTest, |
| ::testing::ValuesIn(std::vector<std::pair<FloatProxy<float>, std::string>>({ |
| {0.f, "0x0p+0"}, |
| {1.f, "0x1p+0"}, |
| {2.f, "0x1p+1"}, |
| {3.f, "0x1.8p+1"}, |
| {0.5f, "0x1p-1"}, |
| {0.25f, "0x1p-2"}, |
| {0.75f, "0x1.8p-1"}, |
| {-0.f, "-0x0p+0"}, |
| {-1.f, "-0x1p+0"}, |
| {-0.5f, "-0x1p-1"}, |
| {-0.25f, "-0x1p-2"}, |
| {-0.75f, "-0x1.8p-1"}, |
| |
| // Larger numbers |
| {512.f, "0x1p+9"}, |
| {-512.f, "-0x1p+9"}, |
| {1024.f, "0x1p+10"}, |
| {-1024.f, "-0x1p+10"}, |
| {1024.f + 8.f, "0x1.02p+10"}, |
| {-1024.f - 8.f, "-0x1.02p+10"}, |
| |
| // Small numbers |
| {1.0f / 512.f, "0x1p-9"}, |
| {1.0f / -512.f, "-0x1p-9"}, |
| {1.0f / 1024.f, "0x1p-10"}, |
| {1.0f / -1024.f, "-0x1p-10"}, |
| {1.0f / 1024.f + 1.0f / 8.f, "0x1.02p-3"}, |
| {1.0f / -1024.f - 1.0f / 8.f, "-0x1.02p-3"}, |
| |
| // lowest non-denorm |
| {float(ldexp(1.0f, -126)), "0x1p-126"}, |
| {float(ldexp(-1.0f, -126)), "-0x1p-126"}, |
| |
| // Denormalized values |
| {float(ldexp(1.0f, -127)), "0x1p-127"}, |
| {float(ldexp(1.0f, -127) / 2.0f), "0x1p-128"}, |
| {float(ldexp(1.0f, -127) / 4.0f), "0x1p-129"}, |
| {float(ldexp(1.0f, -127) / 8.0f), "0x1p-130"}, |
| {float(ldexp(-1.0f, -127)), "-0x1p-127"}, |
| {float(ldexp(-1.0f, -127) / 2.0f), "-0x1p-128"}, |
| {float(ldexp(-1.0f, -127) / 4.0f), "-0x1p-129"}, |
| {float(ldexp(-1.0f, -127) / 8.0f), "-0x1p-130"}, |
| |
| {float(ldexp(1.0, -127) + (ldexp(1.0, -127) / 2.0f)), "0x1.8p-127"}, |
| {float(ldexp(1.0, -127) / 2.0 + (ldexp(1.0, -127) / 4.0f)), |
| "0x1.8p-128"}, |
| |
| }))); |
| |
| INSTANTIATE_TEST_CASE_P( |
| Float32NanTests, HexFloatTest, |
| ::testing::ValuesIn(std::vector<std::pair<FloatProxy<float>, std::string>>({ |
| // Various NAN and INF cases |
| {uint32_t(0xFF800000), "-0x1p+128"}, // -inf |
| {uint32_t(0x7F800000), "0x1p+128"}, // inf |
| {uint32_t(0xFFC00000), "-0x1.8p+128"}, // -nan |
| {uint32_t(0xFF800100), "-0x1.0002p+128"}, // -nan |
| {uint32_t(0xFF800c00), "-0x1.0018p+128"}, // -nan |
| {uint32_t(0xFF80F000), "-0x1.01ep+128"}, // -nan |
| {uint32_t(0xFFFFFFFF), "-0x1.fffffep+128"}, // -nan |
| {uint32_t(0x7FC00000), "0x1.8p+128"}, // +nan |
| {uint32_t(0x7F800100), "0x1.0002p+128"}, // +nan |
| {uint32_t(0x7f800c00), "0x1.0018p+128"}, // +nan |
| {uint32_t(0x7F80F000), "0x1.01ep+128"}, // +nan |
| {uint32_t(0x7FFFFFFF), "0x1.fffffep+128"}, // +nan |
| }))); |
| |
| INSTANTIATE_TEST_CASE_P( |
| Float64Tests, HexDoubleTest, |
| ::testing::ValuesIn( |
| std::vector<std::pair<FloatProxy<double>, std::string>>({ |
| {0., "0x0p+0"}, |
| {1., "0x1p+0"}, |
| {2., "0x1p+1"}, |
| {3., "0x1.8p+1"}, |
| {0.5, "0x1p-1"}, |
| {0.25, "0x1p-2"}, |
| {0.75, "0x1.8p-1"}, |
| {-0., "-0x0p+0"}, |
| {-1., "-0x1p+0"}, |
| {-0.5, "-0x1p-1"}, |
| {-0.25, "-0x1p-2"}, |
| {-0.75, "-0x1.8p-1"}, |
| |
| // Larger numbers |
| {512., "0x1p+9"}, |
| {-512., "-0x1p+9"}, |
| {1024., "0x1p+10"}, |
| {-1024., "-0x1p+10"}, |
| {1024. + 8., "0x1.02p+10"}, |
| {-1024. - 8., "-0x1.02p+10"}, |
| |
| // Large outside the range of normal floats |
| {ldexp(1.0, 128), "0x1p+128"}, |
| {ldexp(1.0, 129), "0x1p+129"}, |
| {ldexp(-1.0, 128), "-0x1p+128"}, |
| {ldexp(-1.0, 129), "-0x1p+129"}, |
| {ldexp(1.0, 128) + ldexp(1.0, 90), "0x1.0000000004p+128"}, |
| {ldexp(1.0, 129) + ldexp(1.0, 120), "0x1.008p+129"}, |
| {ldexp(-1.0, 128) + ldexp(1.0, 90), "-0x1.fffffffff8p+127"}, |
| {ldexp(-1.0, 129) + ldexp(1.0, 120), "-0x1.ffp+128"}, |
| |
| // Small numbers |
| {1.0 / 512., "0x1p-9"}, |
| {1.0 / -512., "-0x1p-9"}, |
| {1.0 / 1024., "0x1p-10"}, |
| {1.0 / -1024., "-0x1p-10"}, |
| {1.0 / 1024. + 1.0 / 8., "0x1.02p-3"}, |
| {1.0 / -1024. - 1.0 / 8., "-0x1.02p-3"}, |
| |
| // Small outside the range of normal floats |
| {ldexp(1.0, -128), "0x1p-128"}, |
| {ldexp(1.0, -129), "0x1p-129"}, |
| {ldexp(-1.0, -128), "-0x1p-128"}, |
| {ldexp(-1.0, -129), "-0x1p-129"}, |
| {ldexp(1.0, -128) + ldexp(1.0, -90), "0x1.0000000004p-90"}, |
| {ldexp(1.0, -129) + ldexp(1.0, -120), "0x1.008p-120"}, |
| {ldexp(-1.0, -128) + ldexp(1.0, -90), "0x1.fffffffff8p-91"}, |
| {ldexp(-1.0, -129) + ldexp(1.0, -120), "0x1.ffp-121"}, |
| |
| // lowest non-denorm |
| {ldexp(1.0, -1022), "0x1p-1022"}, |
| {ldexp(-1.0, -1022), "-0x1p-1022"}, |
| |
| // Denormalized values |
| {ldexp(1.0, -1023), "0x1p-1023"}, |
| {ldexp(1.0, -1023) / 2.0, "0x1p-1024"}, |
| {ldexp(1.0, -1023) / 4.0, "0x1p-1025"}, |
| {ldexp(1.0, -1023) / 8.0, "0x1p-1026"}, |
| {ldexp(-1.0, -1024), "-0x1p-1024"}, |
| {ldexp(-1.0, -1024) / 2.0, "-0x1p-1025"}, |
| {ldexp(-1.0, -1024) / 4.0, "-0x1p-1026"}, |
| {ldexp(-1.0, -1024) / 8.0, "-0x1p-1027"}, |
| |
| {ldexp(1.0, -1023) + (ldexp(1.0, -1023) / 2.0), "0x1.8p-1023"}, |
| {ldexp(1.0, -1023) / 2.0 + (ldexp(1.0, -1023) / 4.0), |
| "0x1.8p-1024"}, |
| |
| }))); |
| |
| INSTANTIATE_TEST_CASE_P( |
| Float64NanTests, HexDoubleTest, |
| ::testing::ValuesIn(std::vector< |
| std::pair<FloatProxy<double>, std::string>>({ |
| // Various NAN and INF cases |
| {uint64_t(0xFFF0000000000000LL), "-0x1p+1024"}, //-inf |
| {uint64_t(0x7FF0000000000000LL), "0x1p+1024"}, //+inf |
| {uint64_t(0xFFF8000000000000LL), "-0x1.8p+1024"}, // -nan |
| {uint64_t(0xFFF0F00000000000LL), "-0x1.0fp+1024"}, // -nan |
| {uint64_t(0xFFF0000000000001LL), "-0x1.0000000000001p+1024"}, // -nan |
| {uint64_t(0xFFF0000300000000LL), "-0x1.00003p+1024"}, // -nan |
| {uint64_t(0xFFFFFFFFFFFFFFFFLL), "-0x1.fffffffffffffp+1024"}, // -nan |
| {uint64_t(0x7FF8000000000000LL), "0x1.8p+1024"}, // +nan |
| {uint64_t(0x7FF0F00000000000LL), "0x1.0fp+1024"}, // +nan |
| {uint64_t(0x7FF0000000000001LL), "0x1.0000000000001p+1024"}, // -nan |
| {uint64_t(0x7FF0000300000000LL), "0x1.00003p+1024"}, // -nan |
| {uint64_t(0x7FFFFFFFFFFFFFFFLL), "0x1.fffffffffffffp+1024"}, // -nan |
| }))); |
| |
| TEST_P(DecodeHexFloatTest, DecodeCorrectly) { |
| EXPECT_THAT(Decode<float>(GetParam().first), Eq(GetParam().second)); |
| } |
| |
| TEST_P(DecodeHexDoubleTest, DecodeCorrectly) { |
| EXPECT_THAT(Decode<double>(GetParam().first), Eq(GetParam().second)); |
| } |
| |
| INSTANTIATE_TEST_CASE_P( |
| Float32DecodeTests, DecodeHexFloatTest, |
| ::testing::ValuesIn(std::vector<std::pair<std::string, FloatProxy<float>>>({ |
| {"0x0p+000", 0.f}, |
| {"0x0p0", 0.f}, |
| {"0x0p-0", 0.f}, |
| |
| // flush to zero cases |
| {"0x1p-500", 0.f}, // Exponent underflows. |
| {"-0x1p-500", -0.f}, |
| {"0x0.00000000001p-126", 0.f}, // Fraction causes underflow. |
| {"-0x0.0000000001p-127", -0.f}, |
| {"-0x0.01p-142", -0.f}, // Fraction causes additional underflow. |
| {"0x0.01p-142", 0.f}, |
| |
| // Some floats that do not encode the same way as they decode. |
| {"0x2p+0", 2.f}, |
| {"0xFFp+0", 255.f}, |
| {"0x0.8p+0", 0.5f}, |
| {"0x0.4p+0", 0.25f}, |
| }))); |
| |
| INSTANTIATE_TEST_CASE_P( |
| Float32DecodeInfTests, DecodeHexFloatTest, |
| ::testing::ValuesIn(std::vector<std::pair<std::string, FloatProxy<float>>>({ |
| // inf cases |
| {"-0x1p+128", uint32_t(0xFF800000)}, // -inf |
| {"0x32p+127", uint32_t(0x7F800000)}, // inf |
| {"0x32p+500", uint32_t(0x7F800000)}, // inf |
| {"-0x32p+127", uint32_t(0xFF800000)}, // -inf |
| }))); |
| |
| INSTANTIATE_TEST_CASE_P( |
| Float64DecodeTests, DecodeHexDoubleTest, |
| ::testing::ValuesIn( |
| std::vector<std::pair<std::string, FloatProxy<double>>>({ |
| {"0x0p+000", 0.}, |
| {"0x0p0", 0.}, |
| {"0x0p-0", 0.}, |
| |
| // flush to zero cases |
| {"0x1p-5000", 0.}, // Exponent underflows. |
| {"-0x1p-5000", -0.}, |
| {"0x0.0000000000000001p-1023", 0.}, // Fraction causes underflow. |
| {"-0x0.000000000000001p-1024", -0.}, |
| {"-0x0.01p-1090", -0.f}, // Fraction causes additional underflow. |
| {"0x0.01p-1090", 0.}, |
| |
| // Some floats that do not encode the same way as they decode. |
| {"0x2p+0", 2.}, |
| {"0xFFp+0", 255.}, |
| {"0x0.8p+0", 0.5}, |
| {"0x0.4p+0", 0.25}, |
| }))); |
| |
| INSTANTIATE_TEST_CASE_P( |
| Float64DecodeInfTests, DecodeHexDoubleTest, |
| ::testing::ValuesIn( |
| std::vector<std::pair<std::string, FloatProxy<double>>>({ |
| // inf cases |
| {"-0x1p+1024", uint64_t(0xFFF0000000000000)}, // -inf |
| {"0x32p+1023", uint64_t(0x7FF0000000000000)}, // inf |
| {"0x32p+5000", uint64_t(0x7FF0000000000000)}, // inf |
| {"-0x32p+1023", uint64_t(0xFFF0000000000000)}, // -inf |
| }))); |
| |
| TEST(FloatProxy, ValidConversion) { |
| EXPECT_THAT(FloatProxy<float>(1.f).getAsFloat(), Eq(1.0f)); |
| EXPECT_THAT(FloatProxy<float>(32.f).getAsFloat(), Eq(32.0f)); |
| EXPECT_THAT(FloatProxy<float>(-1.f).getAsFloat(), Eq(-1.0f)); |
| EXPECT_THAT(FloatProxy<float>(0.f).getAsFloat(), Eq(0.0f)); |
| EXPECT_THAT(FloatProxy<float>(-0.f).getAsFloat(), Eq(-0.0f)); |
| EXPECT_THAT(FloatProxy<float>(1.2e32f).getAsFloat(), Eq(1.2e32f)); |
| |
| EXPECT_TRUE(std::isinf(FloatProxy<float>(uint32_t(0xFF800000)).getAsFloat())); |
| EXPECT_TRUE(std::isinf(FloatProxy<float>(uint32_t(0x7F800000)).getAsFloat())); |
| EXPECT_TRUE(std::isnan(FloatProxy<float>(uint32_t(0xFFC00000)).getAsFloat())); |
| EXPECT_TRUE(std::isnan(FloatProxy<float>(uint32_t(0xFF800100)).getAsFloat())); |
| EXPECT_TRUE(std::isnan(FloatProxy<float>(uint32_t(0xFF800c00)).getAsFloat())); |
| EXPECT_TRUE(std::isnan(FloatProxy<float>(uint32_t(0xFF80F000)).getAsFloat())); |
| EXPECT_TRUE(std::isnan(FloatProxy<float>(uint32_t(0xFFFFFFFF)).getAsFloat())); |
| EXPECT_TRUE(std::isnan(FloatProxy<float>(uint32_t(0x7FC00000)).getAsFloat())); |
| EXPECT_TRUE(std::isnan(FloatProxy<float>(uint32_t(0x7F800100)).getAsFloat())); |
| EXPECT_TRUE(std::isnan(FloatProxy<float>(uint32_t(0x7f800c00)).getAsFloat())); |
| EXPECT_TRUE(std::isnan(FloatProxy<float>(uint32_t(0x7F80F000)).getAsFloat())); |
| EXPECT_TRUE(std::isnan(FloatProxy<float>(uint32_t(0x7FFFFFFF)).getAsFloat())); |
| |
| EXPECT_THAT(FloatProxy<float>(uint32_t(0xFF800000)).data(), Eq(0xFF800000)); |
| EXPECT_THAT(FloatProxy<float>(uint32_t(0x7F800000)).data(), Eq(0x7F800000)); |
| EXPECT_THAT(FloatProxy<float>(uint32_t(0xFFC00000)).data(), Eq(0xFFC00000)); |
| EXPECT_THAT(FloatProxy<float>(uint32_t(0xFF800100)).data(), Eq(0xFF800100)); |
| EXPECT_THAT(FloatProxy<float>(uint32_t(0xFF800c00)).data(), Eq(0xFF800c00)); |
| EXPECT_THAT(FloatProxy<float>(uint32_t(0xFF80F000)).data(), Eq(0xFF80F000)); |
| EXPECT_THAT(FloatProxy<float>(uint32_t(0xFFFFFFFF)).data(), Eq(0xFFFFFFFF)); |
| EXPECT_THAT(FloatProxy<float>(uint32_t(0x7FC00000)).data(), Eq(0x7FC00000)); |
| EXPECT_THAT(FloatProxy<float>(uint32_t(0x7F800100)).data(), Eq(0x7F800100)); |
| EXPECT_THAT(FloatProxy<float>(uint32_t(0x7f800c00)).data(), Eq(0x7f800c00)); |
| EXPECT_THAT(FloatProxy<float>(uint32_t(0x7F80F000)).data(), Eq(0x7F80F000)); |
| EXPECT_THAT(FloatProxy<float>(uint32_t(0x7FFFFFFF)).data(), Eq(0x7FFFFFFF)); |
| } |
| |
| TEST(FloatProxy, Nan) { |
| EXPECT_TRUE(FloatProxy<float>(uint32_t(0xFFC00000)).isNan()); |
| EXPECT_TRUE(FloatProxy<float>(uint32_t(0xFF800100)).isNan()); |
| EXPECT_TRUE(FloatProxy<float>(uint32_t(0xFF800c00)).isNan()); |
| EXPECT_TRUE(FloatProxy<float>(uint32_t(0xFF80F000)).isNan()); |
| EXPECT_TRUE(FloatProxy<float>(uint32_t(0xFFFFFFFF)).isNan()); |
| EXPECT_TRUE(FloatProxy<float>(uint32_t(0x7FC00000)).isNan()); |
| EXPECT_TRUE(FloatProxy<float>(uint32_t(0x7F800100)).isNan()); |
| EXPECT_TRUE(FloatProxy<float>(uint32_t(0x7f800c00)).isNan()); |
| EXPECT_TRUE(FloatProxy<float>(uint32_t(0x7F80F000)).isNan()); |
| EXPECT_TRUE(FloatProxy<float>(uint32_t(0x7FFFFFFF)).isNan()); |
| } |
| |
| TEST(FloatProxy, Negation) { |
| EXPECT_THAT((-FloatProxy<float>(1.f)).getAsFloat(), Eq(-1.0f)); |
| EXPECT_THAT((-FloatProxy<float>(0.f)).getAsFloat(), Eq(-0.0f)); |
| |
| EXPECT_THAT((-FloatProxy<float>(-1.f)).getAsFloat(), Eq(1.0f)); |
| EXPECT_THAT((-FloatProxy<float>(-0.f)).getAsFloat(), Eq(0.0f)); |
| |
| EXPECT_THAT((-FloatProxy<float>(32.f)).getAsFloat(), Eq(-32.0f)); |
| EXPECT_THAT((-FloatProxy<float>(-32.f)).getAsFloat(), Eq(32.0f)); |
| |
| EXPECT_THAT((-FloatProxy<float>(1.2e32f)).getAsFloat(), Eq(-1.2e32f)); |
| EXPECT_THAT((-FloatProxy<float>(-1.2e32f)).getAsFloat(), Eq(1.2e32f)); |
| |
| EXPECT_THAT( |
| (-FloatProxy<float>(std::numeric_limits<float>::infinity())).getAsFloat(), |
| Eq(-std::numeric_limits<float>::infinity())); |
| EXPECT_THAT((-FloatProxy<float>(-std::numeric_limits<float>::infinity())) |
| .getAsFloat(), |
| Eq(std::numeric_limits<float>::infinity())); |
| } |
| |
| // Test conversion of FloatProxy values to strings. |
| // |
| // In previous cases, we always wrapped the FloatProxy value in a HexFloat |
| // before conversion to a string. In the following cases, the FloatProxy |
| // decides for itself whether to print as a regular number or as a hex float. |
| |
| using FloatProxyFloatTest = |
| ::testing::TestWithParam<std::pair<FloatProxy<float>, std::string>>; |
| using FloatProxyDoubleTest = |
| ::testing::TestWithParam<std::pair<FloatProxy<double>, std::string>>; |
| |
| // Converts a float value to a string via a FloatProxy. |
| template <typename T> |
| std::string EncodeViaFloatProxy(const T& value) { |
| std::stringstream ss; |
| ss << value; |
| return ss.str(); |
| } |
| |
| // Converts a floating point string so that the exponent prefix |
| // is 'e', and the exponent value does not have leading zeros. |
| // The Microsoft runtime library likes to write things like "2.5E+010". |
| // Convert that to "2.5e+10". |
| // We don't care what happens to strings that are not floating point |
| // strings. |
| std::string NormalizeExponentInFloatString(std::string in) { |
| std::string result; |
| // Reserve one spot for the terminating null, even when the sscanf fails. |
| std::vector<char> prefix(in.size()+1); |
| char e; |
| char plus_or_minus; |
| int exponent; // in base 10 |
| if ((4 == std::sscanf(in.c_str(), "%[-+.0123456789]%c%c%d", prefix.data(), &e, |
| &plus_or_minus, &exponent)) && |
| (e == 'e' || e == 'E') && |
| (plus_or_minus == '-' || plus_or_minus == '+')) { |
| // It looks like a floating point value with exponent. |
| std::stringstream out; |
| out << prefix.data() << 'e' << plus_or_minus << exponent; |
| result = out.str(); |
| } else { |
| result = in; |
| } |
| return result; |
| } |
| |
| TEST(NormalizeFloat, Sample) { |
| EXPECT_THAT(NormalizeExponentInFloatString(""), Eq("")); |
| EXPECT_THAT(NormalizeExponentInFloatString("1e-12"), Eq("1e-12")); |
| EXPECT_THAT(NormalizeExponentInFloatString("1E+14"), Eq("1e+14")); |
| EXPECT_THAT(NormalizeExponentInFloatString("1e-0012"), Eq("1e-12")); |
| EXPECT_THAT(NormalizeExponentInFloatString("1.263E+014"), Eq("1.263e+14")); |
| } |
| |
| // The following two tests can't be DRY because they take different parameter |
| // types. |
| TEST_P(FloatProxyFloatTest, EncodeCorrectly) { |
| EXPECT_THAT( |
| NormalizeExponentInFloatString(EncodeViaFloatProxy(GetParam().first)), |
| Eq(GetParam().second)); |
| } |
| |
| TEST_P(FloatProxyDoubleTest, EncodeCorrectly) { |
| EXPECT_THAT( |
| NormalizeExponentInFloatString(EncodeViaFloatProxy(GetParam().first)), |
| Eq(GetParam().second)); |
| } |
| |
| INSTANTIATE_TEST_CASE_P( |
| Float32Tests, FloatProxyFloatTest, |
| ::testing::ValuesIn(std::vector<std::pair<FloatProxy<float>, std::string>>({ |
| // Zero |
| {0.f, "0"}, |
| // Normal numbers |
| {1.f, "1"}, |
| {-0.25f, "-0.25"}, |
| {1000.0f, "1000"}, |
| |
| // Still normal numbers, but with large magnitude exponents. |
| {float(ldexp(1.f, 126)), "8.50706e+37"}, |
| {float(ldexp(-1.f, -126)), "-1.17549e-38"}, |
| |
| // denormalized values are printed as hex floats. |
| {float(ldexp(1.0f, -127)), "0x1p-127"}, |
| {float(ldexp(1.5f, -128)), "0x1.8p-128"}, |
| {float(ldexp(1.25, -129)), "0x1.4p-129"}, |
| {float(ldexp(1.125, -130)), "0x1.2p-130"}, |
| {float(ldexp(-1.0f, -127)), "-0x1p-127"}, |
| {float(ldexp(-1.0f, -128)), "-0x1p-128"}, |
| {float(ldexp(-1.0f, -129)), "-0x1p-129"}, |
| {float(ldexp(-1.5f, -130)), "-0x1.8p-130"}, |
| |
| // NaNs |
| {FloatProxy<float>(uint32_t(0xFFC00000)), "-0x1.8p+128"}, |
| {FloatProxy<float>(uint32_t(0xFF800100)), "-0x1.0002p+128"}, |
| |
| {std::numeric_limits<float>::infinity(), "0x1p+128"}, |
| {-std::numeric_limits<float>::infinity(), "-0x1p+128"}, |
| }))); |
| |
| INSTANTIATE_TEST_CASE_P( |
| Float64Tests, FloatProxyDoubleTest, |
| ::testing::ValuesIn( |
| std::vector<std::pair<FloatProxy<double>, std::string>>({ |
| {0., "0"}, |
| {1., "1"}, |
| {-0.25, "-0.25"}, |
| {1000.0, "1000"}, |
| |
| // Large outside the range of normal floats |
| {ldexp(1.0, 128), "3.40282366920938e+38"}, |
| {ldexp(1.5, 129), "1.02084710076282e+39"}, |
| {ldexp(-1.0, 128), "-3.40282366920938e+38"}, |
| {ldexp(-1.5, 129), "-1.02084710076282e+39"}, |
| |
| // Small outside the range of normal floats |
| {ldexp(1.5, -129), "2.20405190779179e-39"}, |
| {ldexp(-1.5, -129), "-2.20405190779179e-39"}, |
| |
| // lowest non-denorm |
| {ldexp(1.0, -1022), "2.2250738585072e-308"}, |
| {ldexp(-1.0, -1022), "-2.2250738585072e-308"}, |
| |
| // Denormalized values |
| {ldexp(1.125, -1023), "0x1.2p-1023"}, |
| {ldexp(-1.375, -1024), "-0x1.6p-1024"}, |
| |
| // NaNs |
| {uint64_t(0x7FF8000000000000LL), "0x1.8p+1024"}, |
| {uint64_t(0xFFF0F00000000000LL), "-0x1.0fp+1024"}, |
| |
| // Infinity |
| {std::numeric_limits<double>::infinity(), "0x1p+1024"}, |
| {-std::numeric_limits<double>::infinity(), "-0x1p+1024"}, |
| |
| }))); |
| |
| // TODO(awoloszyn): Add fp16 tests and HexFloatTraits. |
| } |
