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Workaround for PR2207, in which pred_iterator assert gets triggered due to a

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wee problem in Xcode 2.[45]/gcc 4.0.1.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49831 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Scott Michel 2008-04-16 23:46:39 +00:00
parent 03eb38848c
commit 4bf393a13e
2 changed files with 13 additions and 3 deletions
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5
include/llvm/Support/CFG.h
View File

@ -36,8 +36,11 @@ public:
inline void advancePastNonPreds() {
// Loop to ignore non predecessor uses (for example PHI nodes)...
while (!It.atEnd() && !isa<TerminatorInst>(*It) && !isa<BasicBlock>(*It))
while (!It.atEnd()) {
if (isa<TerminatorInst>(*It) || isa<BasicBlock>(*It))
break;
++It;
}
}
inline PredIterator(_Ptr *bb) : It(bb->use_begin()) {

11
lib/Transforms/Utils/BreakCriticalEdges.cpp
View File

@ -103,8 +103,15 @@ bool llvm::isCriticalEdge(const TerminatorInst *TI, unsigned SuccNum,
// If AllowIdenticalEdges is true, then we allow this edge to be considered
// non-critical iff all preds come from TI's block.
for (; I != E; ++I)
if (*I != FirstPred) return true;
while (I != E) {
pred_const_iterator E1 = E;
if (*I != FirstPred)
return true;
// Note: leave this as is until no one ever compiles with either gcc 4.0.1
// or Xcode 2. This seems to work around the pred_iterator assert in PR 2207
E = pred_end(*I);
++I;
}
return false;
}