diff options
Diffstat (limited to 'lib/Support')
| -rw-r--r-- | lib/Support/ConstantRange.cpp | 5 |
1 files changed, 5 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); |