diff options
| -rw-r--r-- | lib/Transforms/Scalar/LoopStrengthReduce.cpp | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/lib/Transforms/Scalar/LoopStrengthReduce.cpp b/lib/Transforms/Scalar/LoopStrengthReduce.cpp index 38cfd91..6bece9c 100644 --- a/lib/Transforms/Scalar/LoopStrengthReduce.cpp +++ b/lib/Transforms/Scalar/LoopStrengthReduce.cpp @@ -416,12 +416,16 @@ bool LoopStrengthReduce::AddUsersIfInteresting(Instruction *I, Loop *L, if (!getSCEVStartAndStride(ISE, L, Start, Stride)) return false; // Non-reducible symbolic expression, bail out. - for (Value::use_iterator UI = I->use_begin(), E = I->use_end(); UI != E;) { - Instruction *User = cast<Instruction>(*UI); + std::vector<Instruction *> IUsers; + // Collect all I uses now because IVUseShouldUsePostIncValue may + // invalidate use_iterator. + for (Value::use_iterator UI = I->use_begin(), E = I->use_end(); UI != E; ++UI) + IUsers.push_back(cast<Instruction>(*UI)); - // Increment iterator now because IVUseShouldUsePostIncValue may remove - // User from the list of I users. - ++UI; + for (unsigned iused_index = 0, iused_size = IUsers.size(); + iused_index != iused_size; ++iused_index) { + + Instruction *User = IUsers[iused_index]; // Do not infinitely recurse on PHI nodes. if (isa<PHINode>(User) && Processed.count(User)) |