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now that loop passes don't use DomFrontier, there is no reason

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for the unroller to pretend it supports updating it.  It still
has a horrible hack for DomTree.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112444 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-08-29 17:21:35 +00:00
parent eaa40ff74e
commit 937790195e
1 changed files with 2 additions and 8 deletions
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10
lib/Transforms/Scalar/LoopUnrollPass.cpp
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@ -62,13 +62,12 @@ namespace {
AU.addPreservedID(LoopSimplifyID);
AU.addRequiredID(LCSSAID);
AU.addPreservedID(LCSSAID);
AU.addPreserved<ScalarEvolution>();
// FIXME: Loop unroll requires LCSSA. And LCSSA requires dom info.
// If loop unroll does not preserve dom info then LCSSA pass on next
// loop will receive invalid dom info.
// For now, recreate dom info, if loop is unrolled.
AU.addPreserved<DominatorTree>();
AU.addPreserved<DominanceFrontier>();
AU.addPreserved<ScalarEvolution>();
}
};
}
@ -148,12 +147,7 @@ bool LoopUnroll::runOnLoop(Loop *L, LPPassManager &LPM) {
return false;
// FIXME: Reconstruct dom info, because it is not preserved properly.
DominatorTree *DT = getAnalysisIfAvailable<DominatorTree>();
if (DT) {
if (DominatorTree *DT = getAnalysisIfAvailable<DominatorTree>())
DT->runOnFunction(*F);
DominanceFrontier *DF = getAnalysisIfAvailable<DominanceFrontier>();
if (DF)
DF->runOnFunction(*F);
}
return true;
}