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Reconstruct dom info, if loop is unswitched.

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llvm-svn: 53086
This commit is contained in:
Devang Patel 2008-07-03 06:48:21 +00:00
parent f999e47e64
commit 889fe6f848
1 changed files with 9 additions and 4 deletions
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13
lib/Transforms/Scalar/LoopUnswitch.cpp
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@ -113,8 +113,8 @@ namespace {
AU.addRequiredID(LCSSAID);
AU.addPreservedID(LCSSAID);
// FIXME: Loop Unswitch does not preserve dominator info in all cases.
// AU.addPreserved<DominatorTree>();
// AU.addPreserved<DominanceFrontier>();
AU.addPreserved<DominatorTree>();
AU.addPreserved<DominanceFrontier>();
}
private:
@ -206,7 +206,6 @@ bool LoopUnswitch::runOnLoop(Loop *L, LPPassManager &LPM_Ref) {
DT = getAnalysisToUpdate<DominatorTree>();
currentLoop = L;
bool Changed = false;
do {
assert(currentLoop->isLCSSAForm());
redoLoop = false;
@ -459,7 +458,13 @@ bool LoopUnswitch::UnswitchIfProfitable(Value *LoopCond, Constant *Val){
} else {
UnswitchNontrivialCondition(LoopCond, Val, currentLoop);
}
// FIXME: Reconstruct dom info, because it is not preserved properly.
Function *F = loopHeader->getParent();
if (DT)
DT->runOnFunction(*F);
if (DF)
DF->runOnFunction(*F);
return true;
}