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| author | Dan Gohman <gohman@apple.com> | 2010-04-11 22:12:18 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2010-04-11 22:12:18 +0000 |
| commit | bc7129f9dbc6651407134e80a4202adc2ef2511c (patch) | |
| tree | 4ed5d58d6ec1fe55c57948541e5e9e84f8c84574 /lib/Analysis/ScalarEvolution.cpp | |
| parent | e48172710bf78ae210b2257d6ac3e0e8fb3ba792 (diff) | |
When creating a ConstantRange for [n,UINT_MAX], special case n == 0, because
ConstantRange(0, 0) creates an empty range rather than a full one.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100993 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Analysis/ScalarEvolution.cpp')
| -rw-r--r-- | lib/Analysis/ScalarEvolution.cpp | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/lib/Analysis/ScalarEvolution.cpp b/lib/Analysis/ScalarEvolution.cpp index c67cb71b30..44aa5082b1 100644 --- a/lib/Analysis/ScalarEvolution.cpp +++ b/lib/Analysis/ScalarEvolution.cpp @@ -2920,9 +2920,10 @@ ScalarEvolution::getUnsignedRange(const SCEV *S) { // initial value. if (AddRec->hasNoUnsignedWrap()) if (const SCEVConstant *C = dyn_cast<SCEVConstant>(AddRec->getStart())) - ConservativeResult = - ConstantRange(C->getValue()->getValue(), - APInt(getTypeSizeInBits(C->getType()), 0)); + if (!C->isZero()) + ConservativeResult = + ConstantRange(C->getValue()->getValue(), + APInt(getTypeSizeInBits(C->getType()), 0)); // TODO: non-affine addrec if (AddRec->isAffine()) { |