diff options
Diffstat (limited to 'contrib/llvm/lib/Analysis/MemoryDependenceAnalysis.cpp')
| -rw-r--r-- | contrib/llvm/lib/Analysis/MemoryDependenceAnalysis.cpp | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/contrib/llvm/lib/Analysis/MemoryDependenceAnalysis.cpp b/contrib/llvm/lib/Analysis/MemoryDependenceAnalysis.cpp index c0009cb..84ff2ee 100644 --- a/contrib/llvm/lib/Analysis/MemoryDependenceAnalysis.cpp +++ b/contrib/llvm/lib/Analysis/MemoryDependenceAnalysis.cpp @@ -1,4 +1,4 @@ -//===- MemoryDependenceAnalysis.cpp - Mem Deps Implementation --*- C++ -*-===// +//===- MemoryDependenceAnalysis.cpp - Mem Deps Implementation -------------===// // // The LLVM Compiler Infrastructure // @@ -89,7 +89,7 @@ bool MemoryDependenceAnalysis::runOnFunction(Function &) { AA = &getAnalysis<AliasAnalysis>(); TD = getAnalysisIfAvailable<DataLayout>(); DT = getAnalysisIfAvailable<DominatorTree>(); - if (PredCache == 0) + if (!PredCache) PredCache.reset(new PredIteratorCache()); return false; } @@ -371,18 +371,19 @@ getPointerDependencyFrom(const AliasAnalysis::Location &MemLoc, bool isLoad, // Walk backwards through the basic block, looking for dependencies. while (ScanIt != BB->begin()) { + Instruction *Inst = --ScanIt; + + if (IntrinsicInst *II = dyn_cast<IntrinsicInst>(Inst)) + // Debug intrinsics don't (and can't) cause dependencies. + if (isa<DbgInfoIntrinsic>(II)) continue; + // Limit the amount of scanning we do so we don't end up with quadratic // running time on extreme testcases. --Limit; if (!Limit) return MemDepResult::getUnknown(); - Instruction *Inst = --ScanIt; - if (IntrinsicInst *II = dyn_cast<IntrinsicInst>(Inst)) { - // Debug intrinsics don't (and can't) cause dependences. - if (isa<DbgInfoIntrinsic>(II)) continue; - // If we reach a lifetime begin or end marker, then the query ends here // because the value is undefined. if (II->getIntrinsicID() == Intrinsic::lifetime_start) { |
