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Multiplication followed by addition (https://en.wikipedia.org/wiki/Multiply–accumulate_operation) is a sufficiently common use-case to warrant a separate helper. Differential Revision: https://reviews.llvm.org/D48138 llvm-svn: 334635
85 lines
3.3 KiB
C++
85 lines
3.3 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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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), None);
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EXPECT_EQ(checkedAdd<int64_t>(Min, -1), None);
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EXPECT_EQ(checkedAdd<int64_t>(Max, 1), None);
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EXPECT_EQ(checkedAdd<int64_t>(10, 1), Optional<int64_t>(11));
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}
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TEST(CheckedArithmetic, CheckedAddSmall) {
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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), None);
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EXPECT_EQ(checkedAdd<int16_t>(Min, -1), None);
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EXPECT_EQ(checkedAdd<int16_t>(Max, 1), None);
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EXPECT_EQ(checkedAdd<int16_t>(10, 1), Optional<int64_t>(11));
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}
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TEST(CheckedArithmetic, CheckedMul) {
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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), None);
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EXPECT_EQ(checkedMul<int64_t>(Max, Max), None);
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EXPECT_EQ(checkedMul<int64_t>(Min, 2), None);
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EXPECT_EQ(checkedMul<int64_t>(10, 2), Optional<int64_t>(20));
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}
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TEST(CheckedArithmetic, CheckedMulAdd) {
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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(checkedMulAdd<int64_t>(Max, 1, 2), None);
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EXPECT_EQ(checkedMulAdd<int64_t>(1, 1, Max), None);
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EXPECT_EQ(checkedMulAdd<int64_t>(1, -1, Min), None);
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EXPECT_EQ(checkedMulAdd<int64_t>(10, 2, 3), Optional<int64_t>(23));
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}
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TEST(CheckedArithmetic, CheckedMulSmall) {
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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), None);
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EXPECT_EQ(checkedMul<int16_t>(Max, Max), None);
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EXPECT_EQ(checkedMul<int16_t>(Min, 2), None);
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EXPECT_EQ(checkedMul<int16_t>(10, 2), Optional<int16_t>(20));
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}
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TEST(CheckedArithmetic, CheckedMulAddSmall) {
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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(checkedMulAdd<int16_t>(Max, 1, 2), None);
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EXPECT_EQ(checkedMulAdd<int16_t>(1, 1, Max), None);
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EXPECT_EQ(checkedMulAdd<int16_t>(1, -1, Min), None);
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EXPECT_EQ(checkedMulAdd<int16_t>(10, 2, 3), Optional<int16_t>(23));
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}
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TEST(CheckedArithmetic, CheckedAddUnsigned) {
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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), None);
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EXPECT_EQ(checkedAddUnsigned<uint64_t>(Max, 1), None);
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EXPECT_EQ(checkedAddUnsigned<uint64_t>(10, 1), Optional<uint64_t>(11));
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}
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TEST(CheckedArithmetic, CheckedMulUnsigned) {
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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), llvm::None);
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EXPECT_EQ(checkedMulUnsigned<uint64_t>(Max, Max), llvm::None);
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EXPECT_EQ(checkedMulUnsigned<uint64_t>(10, 2), Optional<uint64_t>(20));
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}
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TEST(CheckedArithmetic, CheckedMulAddUnsigned) {
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const uint64_t Max = std::numeric_limits<uint64_t>::max();
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EXPECT_EQ(checkedMulAddUnsigned<uint64_t>(Max, 1, 2), None);
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EXPECT_EQ(checkedMulAddUnsigned<uint64_t>(1, 1, Max), None);
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EXPECT_EQ(checkedMulAddUnsigned<uint64_t>(10, 2, 3), Optional<uint64_t>(23));
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}
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} // namespace
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