unittests/Support/CheckedArithmeticTest.cpp

   1 #include "llvm/Support/CheckedArithmetic.h"
   2 #include "gtest/gtest.h"
   3
   4 using namespace llvm;
   5
   6 namespace {
   7
   8 TEST(CheckedArithmetic, CheckedAdd) {
   9   int64_t Out;
  10   const int64_t Max = std::numeric_limits<int64_t>::max();
  11   const int64_t Min = std::numeric_limits<int64_t>::min();
  12   EXPECT_EQ(checkedAdd<int64_t>(Max, Max, &Out), true);
  13   EXPECT_EQ(checkedAdd<int64_t>(Min, -1, &Out), true);
  14   EXPECT_EQ(checkedAdd<int64_t>(Max, 1, &Out), true);
  15   EXPECT_EQ(checkedAdd<int64_t>(10, 1, &Out), false);
  16   EXPECT_EQ(Out, 11);
  17 }
  18
  19 TEST(CheckedArithmetic, CheckedAddSmall) {
  20   int16_t Out;
  21   const int16_t Max = std::numeric_limits<int16_t>::max();
  22   const int16_t Min = std::numeric_limits<int16_t>::min();
  23   EXPECT_EQ(checkedAdd<int16_t>(Max, Max, &Out), true);
  24   EXPECT_EQ(checkedAdd<int16_t>(Min, -1, &Out), true);
  25   EXPECT_EQ(checkedAdd<int16_t>(Max, 1, &Out), true);
  26   EXPECT_EQ(checkedAdd<int16_t>(10, 1, &Out), false);
  27   EXPECT_EQ(Out, 11);
  28 }
  29
  30 TEST(CheckedArithmetic, CheckedMul) {
  31   int64_t Out;
  32   const int64_t Max = std::numeric_limits<int64_t>::max();
  33   const int64_t Min = std::numeric_limits<int64_t>::min();
  34   EXPECT_EQ(checkedMul<int64_t>(Max, 2, &Out), true);
  35   EXPECT_EQ(checkedMul<int64_t>(Max, Max, &Out), true);
  36   EXPECT_EQ(checkedMul<int64_t>(Min, 2, &Out), true);
  37   EXPECT_EQ(checkedMul<int64_t>(10, 2, &Out), false);
  38   EXPECT_EQ(Out, 20);
  39 }
  40
  41 TEST(CheckedArithmetic, CheckedMulSmall) {
  42   int16_t Out;
  43   const int16_t Max = std::numeric_limits<int16_t>::max();
  44   const int16_t Min = std::numeric_limits<int16_t>::min();
  45   EXPECT_EQ(checkedMul<int16_t>(Max, 2, &Out), true);
  46   EXPECT_EQ(checkedMul<int16_t>(Max, Max, &Out), true);
  47   EXPECT_EQ(checkedMul<int16_t>(Min, 2, &Out), true);
  48   EXPECT_EQ(checkedMul<int16_t>(10, 2, &Out), false);
  49   EXPECT_EQ(Out, 20);
  50 }
  51
  52 TEST(CheckedArithmetic, CheckedAddUnsigned) {
  53   uint64_t Out;
  54   const uint64_t Max = std::numeric_limits<uint64_t>::max();
  55   EXPECT_EQ(checkedAddUnsigned<uint64_t>(Max, Max, &Out), true);
  56   EXPECT_EQ(checkedAddUnsigned<uint64_t>(Max, 1, &Out), true);
  57   EXPECT_EQ(checkedAddUnsigned<uint64_t>(10, 1, &Out), false);
  58   EXPECT_EQ(Out, uint64_t(11));
  59 }
  60
  61 TEST(CheckedArithmetic, CheckedMulUnsigned) {
  62   uint64_t Out;
  63   const uint64_t Max = std::numeric_limits<uint64_t>::max();
  64   EXPECT_EQ(checkedMulUnsigned<uint64_t>(Max, 2, &Out), true);
  65   EXPECT_EQ(checkedMulUnsigned<uint64_t>(Max, Max, &Out), true);
  66   EXPECT_EQ(checkedMulUnsigned<uint64_t>(10, 2, &Out), false);
  67   EXPECT_EQ(Out, uint64_t(20));
  68 }
  69
  70
  71 } // namespace