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105 lines
2.9 KiB
C++
105 lines
2.9 KiB
C++
//===- unittests/Support/MathExtrasTest.cpp - math utils tests ------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "gtest/gtest.h"
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#include "llvm/Support/MathExtras.h"
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using namespace llvm;
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namespace {
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TEST(MathExtras, isPowerOf2_32) {
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EXPECT_TRUE(isPowerOf2_32(1 << 6));
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EXPECT_TRUE(isPowerOf2_32(1 << 12));
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EXPECT_FALSE(isPowerOf2_32((1 << 19) + 3));
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EXPECT_FALSE(isPowerOf2_32(0xABCDEF0));
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}
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TEST(MathExtras, isPowerOf2_64) {
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EXPECT_TRUE(isPowerOf2_64(1LL << 46));
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EXPECT_TRUE(isPowerOf2_64(1LL << 12));
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EXPECT_FALSE(isPowerOf2_64((1LL << 53) + 3));
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EXPECT_FALSE(isPowerOf2_64(0xABCDEF0ABCDEF0LL));
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}
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TEST(MathExtras, ByteSwap_32) {
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EXPECT_EQ(0x44332211u, ByteSwap_32(0x11223344));
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EXPECT_EQ(0xDDCCBBAAu, ByteSwap_32(0xAABBCCDD));
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}
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TEST(MathExtras, ByteSwap_64) {
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EXPECT_EQ(0x8877665544332211ULL, ByteSwap_64(0x1122334455667788LL));
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EXPECT_EQ(0x1100FFEEDDCCBBAAULL, ByteSwap_64(0xAABBCCDDEEFF0011LL));
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}
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TEST(MathExtras, CountLeadingZeros_32) {
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EXPECT_EQ(8u, CountLeadingZeros_32(0x00F000FF));
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EXPECT_EQ(8u, CountLeadingZeros_32(0x00F12345));
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for (unsigned i = 0; i <= 30; ++i) {
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EXPECT_EQ(31 - i, CountLeadingZeros_32(1 << i));
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}
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}
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TEST(MathExtras, CountLeadingZeros_64) {
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EXPECT_EQ(8u, CountLeadingZeros_64(0x00F1234500F12345LL));
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EXPECT_EQ(1u, CountLeadingZeros_64(1LL << 62));
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for (unsigned i = 0; i <= 62; ++i) {
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EXPECT_EQ(63 - i, CountLeadingZeros_64(1LL << i));
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}
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}
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TEST(MathExtras, CountLeadingOnes_32) {
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for (int i = 30; i >= 0; --i) {
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// Start with all ones and unset some bit.
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EXPECT_EQ(31u - i, CountLeadingOnes_32(0xFFFFFFFF ^ (1 << i)));
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}
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}
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TEST(MathExtras, CountLeadingOnes_64) {
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for (int i = 62; i >= 0; --i) {
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// Start with all ones and unset some bit.
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EXPECT_EQ(63u - i, CountLeadingOnes_64(0xFFFFFFFFFFFFFFFFLL ^ (1LL << i)));
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}
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for (int i = 30; i >= 0; --i) {
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// Start with all ones and unset some bit.
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EXPECT_EQ(31u - i, CountLeadingOnes_32(0xFFFFFFFF ^ (1 << i)));
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}
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}
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TEST(MathExtras, FloatBits) {
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static const float kValue = 5632.34f;
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EXPECT_FLOAT_EQ(kValue, BitsToFloat(FloatToBits(kValue)));
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}
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TEST(MathExtras, DoubleBits) {
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static const double kValue = 87987234.983498;
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EXPECT_FLOAT_EQ(kValue, BitsToDouble(DoubleToBits(kValue)));
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}
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TEST(MathExtras, MinAlign) {
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EXPECT_EQ(1u, MinAlign(2, 3));
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EXPECT_EQ(2u, MinAlign(2, 4));
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EXPECT_EQ(1u, MinAlign(17, 64));
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EXPECT_EQ(256u, MinAlign(256, 512));
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}
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TEST(MathExtras, NextPowerOf2) {
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EXPECT_EQ(4u, NextPowerOf2(3));
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EXPECT_EQ(16u, NextPowerOf2(15));
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EXPECT_EQ(256u, NextPowerOf2(128));
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}
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TEST(MathExtras, RoundUpToAlignment) {
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EXPECT_EQ(8u, RoundUpToAlignment(5, 8));
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EXPECT_EQ(24u, RoundUpToAlignment(17, 8));
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EXPECT_EQ(0u, RoundUpToAlignment(~0LL, 8));
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}
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}
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