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[ADT] Add some basic APInt::isPowerOf2() unit test coverage

This commit is contained in:
Simon Pilgrim 2021-10-18 14:58:55 +01:00
parent d5429a13da
commit ac1c0dd317
1 changed files with 20 additions and 0 deletions
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20
llvm/unittests/ADT/APIntTest.cpp
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@ -1765,6 +1765,26 @@ TEST(APIntTest, isShiftedMask) {
}
}
TEST(APIntTest, isPowerOf2) {
EXPECT_FALSE(APInt(5, 0x00).isPowerOf2());
EXPECT_FALSE(APInt(32, 0x11).isPowerOf2());
EXPECT_TRUE(APInt(17, 0x01).isPowerOf2());
EXPECT_TRUE(APInt(32, 0xff << 31).isPowerOf2());
for (int N : {1, 2, 3, 4, 7, 8, 16, 32, 64, 127, 128, 129, 256}) {
EXPECT_FALSE(APInt(N, 0).isPowerOf2());
EXPECT_TRUE(APInt::getSignedMinValue(N).isPowerOf2());
APInt One(N, 1);
for (int I = 1; I < N - 1; ++I) {
EXPECT_TRUE(APInt::getOneBitSet(N, I).isPowerOf2());
APInt MaskVal = One.shl(I);
EXPECT_TRUE(MaskVal.isPowerOf2());
}
}
}
// Test that self-move works with EXPENSIVE_CHECKS. It calls std::shuffle which
// does self-move on some platforms.
#ifdef EXPENSIVE_CHECKS