unittests/Support/MathExtrasTest.cpp

   1 //===- llvm/unittest/Support/MathExtrasTest.cpp - math utils tests --------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #include "gtest/gtest.h"
  11 #include "llvm/Support/MathExtras.h"
  12
  13 using namespace llvm;
  14
  15 namespace {
  16
  17 TEST(MathExtras, isPowerOf2_32) {
  18   EXPECT_TRUE(isPowerOf2_32(1 << 6));
  19   EXPECT_TRUE(isPowerOf2_32(1 << 12));
  20   EXPECT_FALSE(isPowerOf2_32((1 << 19) + 3));
  21   EXPECT_FALSE(isPowerOf2_32(0xABCDEF0));
  22 }
  23
  24 TEST(MathExtras, isPowerOf2_64) {
  25   EXPECT_TRUE(isPowerOf2_64(1LL << 46));
  26   EXPECT_TRUE(isPowerOf2_64(1LL << 12));
  27   EXPECT_FALSE(isPowerOf2_64((1LL << 53) + 3));
  28   EXPECT_FALSE(isPowerOf2_64(0xABCDEF0ABCDEF0));
  29 }
  30
  31 TEST(MathExtras, ByteSwap_32) {
  32   EXPECT_EQ(0x44332211u, ByteSwap_32(0x11223344));
  33   EXPECT_EQ(0xDDCCBBAAu, ByteSwap_32(0xAABBCCDD));
  34 }
  35
  36 TEST(MathExtras, ByteSwap_64) {
  37   EXPECT_EQ(0x8877665544332211ULL, ByteSwap_64(0x1122334455667788));
  38   EXPECT_EQ(0x1100FFEEDDCCBBAAULL, ByteSwap_64(0xAABBCCDDEEFF0011));
  39 }
  40
  41 TEST(MathExtras, CountLeadingZeros_32) {
  42   EXPECT_EQ(8u, CountLeadingZeros_32(0x00F000FF));
  43   EXPECT_EQ(8u, CountLeadingZeros_32(0x00F12345));
  44   for (unsigned i = 0; i <= 30; ++i) {
  45     EXPECT_EQ(31 - i, CountLeadingZeros_32(1 << i));
  46   }
  47 }
  48
  49 TEST(MathExtras, CountLeadingZeros_64) {
  50   EXPECT_EQ(8u, CountLeadingZeros_64(0x00F1234500F12345));
  51   EXPECT_EQ(1u, CountLeadingZeros_64(1LL << 62));
  52   for (unsigned i = 0; i <= 62; ++i) {
  53     EXPECT_EQ(63 - i, CountLeadingZeros_64(1LL << i));
  54   }
  55 }
  56
  57 TEST(MathExtras, CountLeadingOnes_32) {
  58   for (int i = 30; i >= 0; --i) {
  59     // Start with all ones and unset some bit.
  60     EXPECT_EQ(31u - i, CountLeadingOnes_32(0xFFFFFFFF ^ (1 << i)));
  61   }
  62 }
  63
  64 TEST(MathExtras, CountLeadingOnes_64) {
  65   for (int i = 62; i >= 0; --i) {
  66     // Start with all ones and unset some bit.
  67     EXPECT_EQ(63u - i, CountLeadingOnes_64(0xFFFFFFFFFFFFFFFF ^ (1LL << i)));
  68   }
  69   for (int i = 30; i >= 0; --i) {
  70     // Start with all ones and unset some bit.
  71     EXPECT_EQ(31u - i, CountLeadingOnes_32(0xFFFFFFFF ^ (1 << i)));
  72   }
  73 }
  74
  75 TEST(MathExtras, FloatBits) {
  76   static const float kValue = 5632.34;
  77   EXPECT_FLOAT_EQ(kValue, BitsToFloat(FloatToBits(kValue)));
  78 }
  79
  80 TEST(MathExtras, DoubleBits) {
  81   static const double kValue = 87987234.983498;
  82   EXPECT_FLOAT_EQ(kValue, BitsToDouble(DoubleToBits(kValue)));
  83 }
  84
  85 TEST(MathExtras, MinAlign) {
  86   EXPECT_EQ(1u, MinAlign(2, 3));
  87   EXPECT_EQ(2u, MinAlign(2, 4));
  88   EXPECT_EQ(1u, MinAlign(17, 64));
  89   EXPECT_EQ(256u, MinAlign(256, 512));
  90 }
  91
  92 TEST(MathExtras, NextPowerOf2) {
  93   EXPECT_EQ(4u, NextPowerOf2(3));
  94   EXPECT_EQ(16u, NextPowerOf2(15));
  95   EXPECT_EQ(256u, NextPowerOf2(128));
  96 }
  97
  98 TEST(MathExtras, RoundUpToAlignment) {
  99   EXPECT_EQ(8u, RoundUpToAlignment(5, 8));
 100   EXPECT_EQ(24u, RoundUpToAlignment(17, 8));
 101   EXPECT_EQ(0u, RoundUpToAlignment(~0LL, 8));
 102 }
 103
 104 }