[llvm-commits] [llvm] r89975 - /llvm/trunk/lib/Analysis/MemoryDependenceAnalysis.cpp
Chris Lattner
sabre at nondot.org
Thu Nov 26 15:18:49 PST 2009
Author: lattner
Date: Thu Nov 26 17:18:49 2009
New Revision: 89975
URL: http://llvm.org/viewvc/llvm-project?rev=89975&view=rev
Log:
factor some code out into some helper functions.
Modified:
llvm/trunk/lib/Analysis/MemoryDependenceAnalysis.cpp
Modified: llvm/trunk/lib/Analysis/MemoryDependenceAnalysis.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Analysis/MemoryDependenceAnalysis.cpp?rev=89975&r1=89974&r2=89975&view=diff
==============================================================================
--- llvm/trunk/lib/Analysis/MemoryDependenceAnalysis.cpp (original)
+++ llvm/trunk/lib/Analysis/MemoryDependenceAnalysis.cpp Thu Nov 26 17:18:49 2009
@@ -684,6 +684,33 @@
}
}
+/// isPHITranslatable - Return true if the specified computation is derived from
+/// a PHI node in the current block and if it is simple enough for us to handle.
+static bool isPHITranslatable(Instruction *Inst) {
+ if (isa<PHINode>(Inst))
+ return true;
+
+ // TODO: BITCAST, GEP.
+
+ // ...
+
+ // cerr << "MEMDEP: Could not PHI translate: " << *Pointer;
+ // if (isa<BitCastInst>(PtrInst) || isa<GetElementPtrInst>(PtrInst))
+ // cerr << "OP:\t\t\t\t" << *PtrInst->getOperand(0);
+
+ return false;
+}
+
+/// PHITranslateForPred - Given a computation that satisfied the
+/// isPHITranslatable predicate, see if we can translate the computation into
+/// the specified predecessor block. If so, return that value.
+static Value *PHITranslateForPred(Instruction *Inst, BasicBlock *Pred) {
+ if (PHINode *PN = dyn_cast<PHINode>(Inst))
+ return PN->getIncomingValueForBlock(Pred);
+
+ return 0;
+}
+
/// getNonLocalPointerDepFromBB - Perform a dependency query based on
/// pointer/pointeesize starting at the end of StartBB. Add any clobber/def
@@ -827,14 +854,18 @@
NumSortedEntries = Cache->size();
}
- // If this is directly a PHI node, just use the incoming values for each
- // pred as the phi translated version.
- if (PHINode *PtrPHI = dyn_cast<PHINode>(PtrInst)) {
+ // If this is a computation derived from a PHI node, use the suitably
+ // translated incoming values for each pred as the phi translated version.
+ if (isPHITranslatable(PtrInst)) {
Cache = 0;
for (BasicBlock **PI = PredCache->GetPreds(BB); *PI; ++PI) {
BasicBlock *Pred = *PI;
- Value *PredPtr = PtrPHI->getIncomingValueForBlock(Pred);
+ Value *PredPtr = PHITranslateForPred(PtrInst, Pred);
+
+ // If PHI translation fails, bail out.
+ if (PredPtr == 0)
+ goto PredTranslationFailure;
// Check to see if we have already visited this pred block with another
// pointer. If so, we can't do this lookup. This failure can occur
@@ -881,12 +912,7 @@
SkipFirstBlock = false;
continue;
}
-
- // TODO: BITCAST, GEP.
-
- // cerr << "MEMDEP: Could not PHI translate: " << *Pointer;
- // if (isa<BitCastInst>(PtrInst) || isa<GetElementPtrInst>(PtrInst))
- // cerr << "OP:\t\t\t\t" << *PtrInst->getOperand(0);
+
PredTranslationFailure:
if (Cache == 0) {
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