diff options
| -rw-r--r-- | lib/Support/ConstantRange.cpp | 5 | ||||
| -rw-r--r-- | unittests/Support/ConstantRangeTest.cpp | 3 |
2 files changed, 8 insertions, 0 deletions
diff --git a/lib/Support/ConstantRange.cpp b/lib/Support/ConstantRange.cpp index 1085a45..e3b43ed 100644 --- a/lib/Support/ConstantRange.cpp +++ b/lib/Support/ConstantRange.cpp @@ -445,6 +445,11 @@ ConstantRange ConstantRange::signExtend(uint32_t DstTySize) const { unsigned SrcTySize = getBitWidth(); assert(SrcTySize < DstTySize && "Not a value extension"); + + // special case: [X, INT_MIN) -- not really wrapping around + if (Upper == APInt::getHighBitsSet(SrcTySize, 1)) + return ConstantRange(Lower.sext(DstTySize), Upper.zext(DstTySize)); + if (isFullSet() || isSignWrappedSet()) { return ConstantRange(APInt::getHighBitsSet(DstTySize,DstTySize-SrcTySize+1), APInt::getLowBitsSet(DstTySize, SrcTySize-1) + 1); diff --git a/unittests/Support/ConstantRangeTest.cpp b/unittests/Support/ConstantRangeTest.cpp index 4d6bbf6..3e0a085 100644 --- a/unittests/Support/ConstantRangeTest.cpp +++ b/unittests/Support/ConstantRangeTest.cpp @@ -216,6 +216,9 @@ TEST_F(ConstantRangeTest, SExt) { EXPECT_EQ(ConstantRange(APInt(8, 120), APInt(8, 140)).signExtend(16), ConstantRange(APInt(16, -128), APInt(16, 128))); + + EXPECT_EQ(ConstantRange(APInt(16, 0x0200), APInt(16, 0x8000)).signExtend(19), + ConstantRange(APInt(19, 0x0200), APInt(19, 0x8000))); } TEST_F(ConstantRangeTest, IntersectWith) { |