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| author | Nuno Lopes <nunoplopes@sapo.pt> | 2013-10-30 15:36:50 +0000 |
|---|---|---|
| committer | Nuno Lopes <nunoplopes@sapo.pt> | 2013-10-30 15:36:50 +0000 |
| commit | 1112eca0afb3b919b44de6b8688c37dd5111a300 (patch) | |
| tree | 33a2254d31a892968c8406bfb98c01237a67abd6 /llvm/lib/Support | |
| parent | ab94b537d75278f93918b202417c23ad561a101b (diff) | |
| download | bcm5719-llvm-1112eca0afb3b919b44de6b8688c37dd5111a300.tar.gz bcm5719-llvm-1112eca0afb3b919b44de6b8688c37dd5111a300.zip | |
make ConstantRange::signExtend() optimal
the case [x, INT_MIN) was not handled optimally
llvm-svn: 193694
Diffstat (limited to 'llvm/lib/Support')
| -rw-r--r-- | llvm/lib/Support/ConstantRange.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/llvm/lib/Support/ConstantRange.cpp b/llvm/lib/Support/ConstantRange.cpp index 1085a45d0a2..e3b43ed6df6 100644 --- a/llvm/lib/Support/ConstantRange.cpp +++ b/llvm/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); |
