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2d8ec49fc8
Provide checkedAdd and checkedMul functions, providing checked arithmetic on signed integers. Differential Revision: https://reviews.llvm.org/D43704 llvm-svn: 326516
72 lines
2.4 KiB
C++
72 lines
2.4 KiB
C++
#include "llvm/Support/CheckedArithmetic.h"
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#include "gtest/gtest.h"
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using namespace llvm;
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namespace {
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TEST(CheckedArithmetic, CheckedAdd) {
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int64_t Out;
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const int64_t Max = std::numeric_limits<int64_t>::max();
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const int64_t Min = std::numeric_limits<int64_t>::min();
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EXPECT_EQ(checkedAdd<int64_t>(Max, Max, &Out), true);
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EXPECT_EQ(checkedAdd<int64_t>(Min, -1, &Out), true);
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EXPECT_EQ(checkedAdd<int64_t>(Max, 1, &Out), true);
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EXPECT_EQ(checkedAdd<int64_t>(10, 1, &Out), false);
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EXPECT_EQ(Out, 11);
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}
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TEST(CheckedArithmetic, CheckedAddSmall) {
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int16_t Out;
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const int16_t Max = std::numeric_limits<int16_t>::max();
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const int16_t Min = std::numeric_limits<int16_t>::min();
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EXPECT_EQ(checkedAdd<int16_t>(Max, Max, &Out), true);
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EXPECT_EQ(checkedAdd<int16_t>(Min, -1, &Out), true);
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EXPECT_EQ(checkedAdd<int16_t>(Max, 1, &Out), true);
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EXPECT_EQ(checkedAdd<int16_t>(10, 1, &Out), false);
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EXPECT_EQ(Out, 11);
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}
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TEST(CheckedArithmetic, CheckedMul) {
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int64_t Out;
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const int64_t Max = std::numeric_limits<int64_t>::max();
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const int64_t Min = std::numeric_limits<int64_t>::min();
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EXPECT_EQ(checkedMul<int64_t>(Max, 2, &Out), true);
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EXPECT_EQ(checkedMul<int64_t>(Max, Max, &Out), true);
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EXPECT_EQ(checkedMul<int64_t>(Min, 2, &Out), true);
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EXPECT_EQ(checkedMul<int64_t>(10, 2, &Out), false);
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EXPECT_EQ(Out, 20);
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}
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TEST(CheckedArithmetic, CheckedMulSmall) {
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int16_t Out;
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const int16_t Max = std::numeric_limits<int16_t>::max();
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const int16_t Min = std::numeric_limits<int16_t>::min();
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EXPECT_EQ(checkedMul<int16_t>(Max, 2, &Out), true);
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EXPECT_EQ(checkedMul<int16_t>(Max, Max, &Out), true);
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EXPECT_EQ(checkedMul<int16_t>(Min, 2, &Out), true);
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EXPECT_EQ(checkedMul<int16_t>(10, 2, &Out), false);
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EXPECT_EQ(Out, 20);
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}
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TEST(CheckedArithmetic, CheckedAddUnsigned) {
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uint64_t Out;
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const uint64_t Max = std::numeric_limits<uint64_t>::max();
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EXPECT_EQ(checkedAddUnsigned<uint64_t>(Max, Max, &Out), true);
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EXPECT_EQ(checkedAddUnsigned<uint64_t>(Max, 1, &Out), true);
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EXPECT_EQ(checkedAddUnsigned<uint64_t>(10, 1, &Out), false);
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EXPECT_EQ(Out, uint64_t(11));
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}
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TEST(CheckedArithmetic, CheckedMulUnsigned) {
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uint64_t Out;
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const uint64_t Max = std::numeric_limits<uint64_t>::max();
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EXPECT_EQ(checkedMulUnsigned<uint64_t>(Max, 2, &Out), true);
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EXPECT_EQ(checkedMulUnsigned<uint64_t>(Max, Max, &Out), true);
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EXPECT_EQ(checkedMulUnsigned<uint64_t>(10, 2, &Out), false);
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EXPECT_EQ(Out, uint64_t(20));
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}
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} // namespace
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