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| author | Juergen Ributzka <juergen@apple.com> | 2013-10-24 05:29:56 +0000 |
|---|---|---|
| committer | Juergen Ributzka <juergen@apple.com> | 2013-10-24 05:29:56 +0000 |
| commit | d084153a8fd8ee058fd4c39d4f15d3f988566d95 (patch) | |
| tree | 1353ec643914e9de2d02a9d9eb3d6500b1bfaabb /lib/Transforms | |
| parent | cbbd20879e8acf35d3326a2459e17a298b5f5d15 (diff) | |
| download | external_llvm-d084153a8fd8ee058fd4c39d4f15d3f988566d95.zip external_llvm-d084153a8fd8ee058fd4c39d4f15d3f988566d95.tar.gz external_llvm-d084153a8fd8ee058fd4c39d4f15d3f988566d95.tar.bz2 | |
Fix a bug in LinearFunctionTestReplace that created invalid loop exit checks.
Reviewed by Andy
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193303 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms')
| -rw-r--r-- | lib/Transforms/Scalar/IndVarSimplify.cpp | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/lib/Transforms/Scalar/IndVarSimplify.cpp b/lib/Transforms/Scalar/IndVarSimplify.cpp index 7785855..cfd8db0 100644 --- a/lib/Transforms/Scalar/IndVarSimplify.cpp +++ b/lib/Transforms/Scalar/IndVarSimplify.cpp @@ -1479,8 +1479,14 @@ static Value *genLoopLimit(PHINode *IndVar, const SCEV *IVCount, Loop *L, if (IndVar->getType()->isPointerTy() && !IVCount->getType()->isPointerTy()) { + // IVOffset will be the new GEP offset that is interpreted by GEP as a + // signed value. IVCount on the other hand represents the loop trip count, + // which is an unsigned value. FindLoopCounter only allows induction + // variables that have a positive unit stride of one. This means we don't + // have to handle the case of negative offsets (yet) and just need to zero + // extend IVCount. Type *OfsTy = SE->getEffectiveSCEVType(IVInit->getType()); - const SCEV *IVOffset = SE->getTruncateOrSignExtend(IVCount, OfsTy); + const SCEV *IVOffset = SE->getTruncateOrZeroExtend(IVCount, OfsTy); // Expand the code for the iteration count. assert(SE->isLoopInvariant(IVOffset, L) && |