dolphin/Source/UnitTests/Common/FloatUtilsTest.cpp

67 lines
2.6 KiB
C++

// Copyright 2018 Dolphin Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include <limits>
#include <random>
#include <gtest/gtest.h>
#include "Common/BitUtils.h"
#include "Common/FloatUtils.h"
TEST(FloatUtils, IsQNAN)
{
EXPECT_TRUE(Common::IsQNAN(std::numeric_limits<double>::quiet_NaN()));
EXPECT_FALSE(Common::IsQNAN(Common::SNANConstant<double>()));
}
TEST(FloatUtils, IsSNAN)
{
EXPECT_FALSE(Common::IsSNAN(std::numeric_limits<double>::quiet_NaN()));
EXPECT_TRUE(Common::IsSNAN(Common::SNANConstant<double>()));
}
TEST(FloatUtils, FlushToZero)
{
// To test the software implementation we need to make sure FTZ and DAZ are disabled.
// Using volatile here to ensure the compiler doesn't constant-fold it,
// we want the multiplication to occur at test runtime.
volatile float s = std::numeric_limits<float>::denorm_min();
volatile double d = std::numeric_limits<double>::denorm_min();
// Casting away the volatile attribute is required in order for msvc to resolve this to the
// correct instance of the comparison function.
EXPECT_LT(0.f, (float)(s * 2));
EXPECT_LT(0.0, (double)(d * 2));
EXPECT_EQ(+0.0, Common::FlushToZero(+std::numeric_limits<double>::denorm_min()));
EXPECT_EQ(-0.0, Common::FlushToZero(-std::numeric_limits<double>::denorm_min()));
EXPECT_EQ(+0.0, Common::FlushToZero(+std::numeric_limits<double>::min() / 2));
EXPECT_EQ(-0.0, Common::FlushToZero(-std::numeric_limits<double>::min() / 2));
EXPECT_EQ(std::numeric_limits<double>::min(),
Common::FlushToZero(std::numeric_limits<double>::min()));
EXPECT_EQ(std::numeric_limits<double>::max(),
Common::FlushToZero(std::numeric_limits<double>::max()));
EXPECT_EQ(+std::numeric_limits<double>::infinity(),
Common::FlushToZero(+std::numeric_limits<double>::infinity()));
EXPECT_EQ(-std::numeric_limits<double>::infinity(),
Common::FlushToZero(-std::numeric_limits<double>::infinity()));
// Test all subnormals as well as an equally large set of random normal floats.
std::default_random_engine engine(0);
std::uniform_int_distribution<u32> dist(0x00800000u, 0x7fffffffu);
for (u32 i = 0; i <= 0x007fffffu; ++i)
{
u32 i_tmp = i;
EXPECT_EQ(+0.f, Common::FlushToZero(Common::BitCast<float>(i_tmp)));
i_tmp |= 0x80000000u;
EXPECT_EQ(-0.f, Common::FlushToZero(Common::BitCast<float>(i_tmp)));
i_tmp = dist(engine);
EXPECT_EQ(i_tmp, Common::BitCast<u32>(Common::FlushToZero(Common::BitCast<float>(i_tmp))));
i_tmp |= 0x80000000u;
EXPECT_EQ(i_tmp, Common::BitCast<u32>(Common::FlushToZero(Common::BitCast<float>(i_tmp))));
}
}