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Fix pr4195: When iterating through predecessor blocks, break out of the loop

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after finding the (unique) layout predecessor.  Sometimes a block may be listed
more than once, and processing it more than once in this loop can lead to
inconsistent values for FtTBB/FtFBB, since the AnalyzeBranch method does not
clear these values.  There's no point in continuing the loop regardless.
The testcase for this is reduced from the 2003-05-02-DependentPHI SingleSource
test.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71536 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bob Wilson
2009-05-12 03:48:10 +00:00
parent 81db61a2e6
commit 74b0ccc577
2 changed files with 33 additions and 3 deletions
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6
lib/CodeGen/CodePlacementOpt.cpp
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@@ -155,10 +155,10 @@ bool CodePlacementOpt::OptimizeIntraLoopEdges() {
// A fallthrough.
FtMBB = PredMBB;
MachineLoop *PL = MLI->getLoopFor(PredMBB);
if (PL && (PL == L || PL->getLoopDepth() >= L->getLoopDepth())) {
if (PL && (PL == L || PL->getLoopDepth() >= L->getLoopDepth()))
OkToMove = false;
break;
}
break;
}
}