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Minor tweak to MDA
[oota-llvm.git]
/
lib
/
Analysis
/
MemoryDependenceAnalysis.cpp
diff --git
a/lib/Analysis/MemoryDependenceAnalysis.cpp
b/lib/Analysis/MemoryDependenceAnalysis.cpp
index bcfea647b529e3d16d2f23e0780c9e3a26298af4..fa67aeb1bce3bf6ea1bb5a2ebf4d771ef0c4452f 100644
(file)
--- a/
lib/Analysis/MemoryDependenceAnalysis.cpp
+++ b/
lib/Analysis/MemoryDependenceAnalysis.cpp
@@
-423,7
+423,9
@@
getPointerDependencyFrom(const AliasAnalysis::Location &MemLoc, bool isLoad,
}
// Walk backwards through the basic block, looking for dependencies.
}
// Walk backwards through the basic block, looking for dependencies.
- while (ScanIt != BB->begin()) {
+ // We can stop before processing PHIs or dbg intrinsics.
+ const BasicBlock::iterator Begin(BB->getFirstNonPHIOrDbg());
+ while (ScanIt != Begin) {
Instruction *Inst = --ScanIt;
if (IntrinsicInst *II = dyn_cast<IntrinsicInst>(Inst))
Instruction *Inst = --ScanIt;
if (IntrinsicInst *II = dyn_cast<IntrinsicInst>(Inst))