Merge branch 'master' into stable

1 files changed, 100 insertions, 0 deletions

diff --git a/Source/UnitTests/Common/MathUtilTest.cpp b/Source/UnitTests/Common/MathUtilTest.cpp
new file mode 100644
index 0000000000..c5f2f20b65
--- /dev/null
+++ b/Source/UnitTests/Common/MathUtilTest.cpp
@@ -0,0 +1,100 @@
+// Copyright 2014 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include <limits>
+#include <random>
+#include <gtest/gtest.h>
+
+#include "Common/MathUtil.h"
+
+TEST(MathUtil, Clamp)
+{
+	EXPECT_EQ(1, MathUtil::Clamp(1, 0, 2));
+	EXPECT_EQ(1.0, MathUtil::Clamp(1.0, 0.0, 2.0));
+
+	EXPECT_EQ(2, MathUtil::Clamp(4, 0, 2));
+	EXPECT_EQ(2.0, MathUtil::Clamp(4.0, 0.0, 2.0));
+
+	EXPECT_EQ(0, MathUtil::Clamp(-1, 0, 2));
+	EXPECT_EQ(0.0, MathUtil::Clamp(-1.0, 0.0, 2.0));
+}
+
+TEST(MathUtil, IsINF)
+{
+	EXPECT_TRUE(MathUtil::IsINF(+std::numeric_limits<double>::infinity()));
+	EXPECT_TRUE(MathUtil::IsINF(-std::numeric_limits<double>::infinity()));
+}
+
+TEST(MathUtil, IsNAN)
+{
+	EXPECT_TRUE(MathUtil::IsNAN(std::numeric_limits<double>::quiet_NaN()));
+	EXPECT_TRUE(MathUtil::IsNAN(std::numeric_limits<double>::signaling_NaN()));
+}
+
+TEST(MathUtil, IsQNAN)
+{
+	EXPECT_TRUE(MathUtil::IsQNAN(std::numeric_limits<double>::quiet_NaN()));
+	EXPECT_FALSE(MathUtil::IsQNAN(std::numeric_limits<double>::signaling_NaN()));
+}
+
+TEST(MathUtil, IsSNAN)
+{
+	EXPECT_FALSE(MathUtil::IsSNAN(std::numeric_limits<double>::quiet_NaN()));
+	EXPECT_TRUE(MathUtil::IsSNAN(std::numeric_limits<double>::signaling_NaN()));
+}
+
+TEST(MathUtil, IntLog2)
+{
+	EXPECT_EQ(0, IntLog2(1));
+	EXPECT_EQ(1, IntLog2(2));
+	EXPECT_EQ(2, IntLog2(4));
+	EXPECT_EQ(3, IntLog2(8));
+	EXPECT_EQ(63, IntLog2(0x8000000000000000ull));
+
+	// Rounding behavior.
+	EXPECT_EQ(3, IntLog2(15));
+	EXPECT_EQ(63, IntLog2(0xFFFFFFFFFFFFFFFFull));
+}
+
+TEST(MathUtil, 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, MathUtil::FlushToZero(+std::numeric_limits<double>::denorm_min()));
+	EXPECT_EQ(-0.0, MathUtil::FlushToZero(-std::numeric_limits<double>::denorm_min()));
+	EXPECT_EQ(+0.0, MathUtil::FlushToZero(+std::numeric_limits<double>::min() / 2));
+	EXPECT_EQ(-0.0, MathUtil::FlushToZero(-std::numeric_limits<double>::min() / 2));
+	EXPECT_EQ(std::numeric_limits<double>::min(), MathUtil::FlushToZero(std::numeric_limits<double>::min()));
+	EXPECT_EQ(std::numeric_limits<double>::max(), MathUtil::FlushToZero(std::numeric_limits<double>::max()));
+	EXPECT_EQ(+std::numeric_limits<double>::infinity(), MathUtil::FlushToZero(+std::numeric_limits<double>::infinity()));
+	EXPECT_EQ(-std::numeric_limits<double>::infinity(), MathUtil::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)
+	{
+		MathUtil::IntFloat x(i);
+		EXPECT_EQ(+0.f, MathUtil::FlushToZero(x.f));
+
+		x.i = i | 0x80000000u;
+		EXPECT_EQ(-0.f, MathUtil::FlushToZero(x.f));
+
+		x.i = dist(engine);
+		MathUtil::IntFloat y(MathUtil::FlushToZero(x.f));
+		EXPECT_EQ(x.i, y.i);
+
+		x.i |= 0x80000000u;
+		y.f = MathUtil::FlushToZero(x.f);
+		EXPECT_EQ(x.i, y.i);
+	}
+}