1 //===- unittests/Support/MathExtrasTest.cpp - math utils tests ------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "gtest/gtest.h"
11 #include "llvm/Support/MathExtras.h"
17 TEST(MathExtras, countTrailingZeros) {
22 EXPECT_EQ(8u, countTrailingZeros(Z8));
23 EXPECT_EQ(16u, countTrailingZeros(Z16));
24 EXPECT_EQ(32u, countTrailingZeros(Z32));
25 EXPECT_EQ(64u, countTrailingZeros(Z64));
31 EXPECT_EQ(1u, countTrailingZeros(NZ8));
32 EXPECT_EQ(1u, countTrailingZeros(NZ16));
33 EXPECT_EQ(1u, countTrailingZeros(NZ32));
34 EXPECT_EQ(1u, countTrailingZeros(NZ64));
37 TEST(MathExtras, countLeadingZeros) {
42 EXPECT_EQ(8u, countLeadingZeros(Z8));
43 EXPECT_EQ(16u, countLeadingZeros(Z16));
44 EXPECT_EQ(32u, countLeadingZeros(Z32));
45 EXPECT_EQ(64u, countLeadingZeros(Z64));
51 EXPECT_EQ(2u, countLeadingZeros(NZ8));
52 EXPECT_EQ(10u, countLeadingZeros(NZ16));
53 EXPECT_EQ(26u, countLeadingZeros(NZ32));
54 EXPECT_EQ(58u, countLeadingZeros(NZ64));
56 EXPECT_EQ(8u, countLeadingZeros(0x00F000FFu));
57 EXPECT_EQ(8u, countLeadingZeros(0x00F12345u));
58 for (unsigned i = 0; i <= 30; ++i) {
59 EXPECT_EQ(31 - i, countLeadingZeros(1u << i));
62 EXPECT_EQ(8u, countLeadingZeros(0x00F1234500F12345ULL));
63 EXPECT_EQ(1u, countLeadingZeros(1ULL << 62));
64 for (unsigned i = 0; i <= 62; ++i) {
65 EXPECT_EQ(63 - i, countLeadingZeros(1ULL << i));
69 TEST(MathExtras, findFirstSet) {
74 EXPECT_EQ(0xFFULL, findFirstSet(Z8));
75 EXPECT_EQ(0xFFFFULL, findFirstSet(Z16));
76 EXPECT_EQ(0xFFFFFFFFULL, findFirstSet(Z32));
77 EXPECT_EQ(0xFFFFFFFFFFFFFFFFULL, findFirstSet(Z64));
83 EXPECT_EQ(1u, findFirstSet(NZ8));
84 EXPECT_EQ(1u, findFirstSet(NZ16));
85 EXPECT_EQ(1u, findFirstSet(NZ32));
86 EXPECT_EQ(1u, findFirstSet(NZ64));
89 TEST(MathExtras, findLastSet) {
94 EXPECT_EQ(0xFFULL, findLastSet(Z8));
95 EXPECT_EQ(0xFFFFULL, findLastSet(Z16));
96 EXPECT_EQ(0xFFFFFFFFULL, findLastSet(Z32));
97 EXPECT_EQ(0xFFFFFFFFFFFFFFFFULL, findLastSet(Z64));
103 EXPECT_EQ(5u, findLastSet(NZ8));
104 EXPECT_EQ(5u, findLastSet(NZ16));
105 EXPECT_EQ(5u, findLastSet(NZ32));
106 EXPECT_EQ(5u, findLastSet(NZ64));
109 TEST(MathExtras, reverseBits) {
114 EXPECT_EQ(0x54ULL, reverseBits(NZ8));
115 EXPECT_EQ(0x5400ULL, reverseBits(NZ16));
116 EXPECT_EQ(0x54000000ULL, reverseBits(NZ32));
117 EXPECT_EQ(0x5400000000000000ULL, reverseBits(NZ64));
120 TEST(MathExtras, isPowerOf2_32) {
121 EXPECT_TRUE(isPowerOf2_32(1 << 6));
122 EXPECT_TRUE(isPowerOf2_32(1 << 12));
123 EXPECT_FALSE(isPowerOf2_32((1 << 19) + 3));
124 EXPECT_FALSE(isPowerOf2_32(0xABCDEF0));
127 TEST(MathExtras, isPowerOf2_64) {
128 EXPECT_TRUE(isPowerOf2_64(1LL << 46));
129 EXPECT_TRUE(isPowerOf2_64(1LL << 12));
130 EXPECT_FALSE(isPowerOf2_64((1LL << 53) + 3));
131 EXPECT_FALSE(isPowerOf2_64(0xABCDEF0ABCDEF0LL));
134 TEST(MathExtras, ByteSwap_32) {
135 EXPECT_EQ(0x44332211u, ByteSwap_32(0x11223344));
136 EXPECT_EQ(0xDDCCBBAAu, ByteSwap_32(0xAABBCCDD));
139 TEST(MathExtras, ByteSwap_64) {
140 EXPECT_EQ(0x8877665544332211ULL, ByteSwap_64(0x1122334455667788LL));
141 EXPECT_EQ(0x1100FFEEDDCCBBAAULL, ByteSwap_64(0xAABBCCDDEEFF0011LL));
144 TEST(MathExtras, CountLeadingOnes_32) {
145 for (int i = 30; i >= 0; --i) {
146 // Start with all ones and unset some bit.
147 EXPECT_EQ(31u - i, CountLeadingOnes_32(0xFFFFFFFF ^ (1 << i)));
151 TEST(MathExtras, CountLeadingOnes_64) {
152 for (int i = 62; i >= 0; --i) {
153 // Start with all ones and unset some bit.
154 EXPECT_EQ(63u - i, CountLeadingOnes_64(0xFFFFFFFFFFFFFFFFLL ^ (1LL << i)));
156 for (int i = 30; i >= 0; --i) {
157 // Start with all ones and unset some bit.
158 EXPECT_EQ(31u - i, CountLeadingOnes_32(0xFFFFFFFF ^ (1 << i)));
162 TEST(MathExtras, FloatBits) {
163 static const float kValue = 5632.34f;
164 EXPECT_FLOAT_EQ(kValue, BitsToFloat(FloatToBits(kValue)));
167 TEST(MathExtras, DoubleBits) {
168 static const double kValue = 87987234.983498;
169 EXPECT_FLOAT_EQ(kValue, BitsToDouble(DoubleToBits(kValue)));
172 TEST(MathExtras, MinAlign) {
173 EXPECT_EQ(1u, MinAlign(2, 3));
174 EXPECT_EQ(2u, MinAlign(2, 4));
175 EXPECT_EQ(1u, MinAlign(17, 64));
176 EXPECT_EQ(256u, MinAlign(256, 512));
179 TEST(MathExtras, NextPowerOf2) {
180 EXPECT_EQ(4u, NextPowerOf2(3));
181 EXPECT_EQ(16u, NextPowerOf2(15));
182 EXPECT_EQ(256u, NextPowerOf2(128));
185 TEST(MathExtras, RoundUpToAlignment) {
186 EXPECT_EQ(8u, RoundUpToAlignment(5, 8));
187 EXPECT_EQ(24u, RoundUpToAlignment(17, 8));
188 EXPECT_EQ(0u, RoundUpToAlignment(~0LL, 8));