From: Chris Lattner Date: Tue, 2 Aug 2005 00:41:11 +0000 (+0000) Subject: Fix an iterator invalidation problem X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=1060e09fb207ed778581957671f8803d2df3a581;p=oota-llvm.git Fix an iterator invalidation problem git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22575 91177308-0d34-0410-b5e6-96231b3b80d8 --- diff --git a/lib/Transforms/Scalar/LoopStrengthReduce.cpp b/lib/Transforms/Scalar/LoopStrengthReduce.cpp index f06cf33c138..0967fb7200b 100644 --- a/lib/Transforms/Scalar/LoopStrengthReduce.cpp +++ b/lib/Transforms/Scalar/LoopStrengthReduce.cpp @@ -622,7 +622,9 @@ void LoopStrengthReduce::runOnLoop(Loop *L) { BasicBlock::iterator I = L->getHeader()->begin(); PHINode *PN; - for (; (PN = dyn_cast(I)); ++I) { + for (; (PN = dyn_cast(I)); ) { + ++I; // Preincrement iterator to avoid invalidating it when deleting PN. + // At this point, we know that we have killed one or more GEP instructions. // It is worth checking to see if the cann indvar is also dead, so that we // can remove it as well. The requirements for the cann indvar to be