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Preserve dom info. 

llvm-svn: 53089
This commit is contained in:
Devang Patel 2008-07-03 07:04:22 +00:00
parent 874a3a0b0d
commit f94b9826b5
1 changed files with 15 additions and 0 deletions
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15
llvm/lib/Transforms/Scalar/LoopUnroll.cpp
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@ -55,6 +55,12 @@ namespace {
AU.addRequired<LoopInfo>();
AU.addPreservedID(LCSSAID);
AU.addPreserved<LoopInfo>();
// 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>();
}
};
}
@ -137,8 +143,17 @@ bool LoopUnroll::runOnLoop(Loop *L, LPPassManager &LPM) {
}
// Unroll the loop.
Function *F = L->getHeader()->getParent();
if (!UnrollLoop(L, Count, LI, &LPM))
return false;
// FIXME: Reconstruct dom info, because it is not preserved properly.
DominatorTree *DT = getAnalysisToUpdate<DominatorTree>();
if (DT) {
DT->runOnFunction(*F);
DominanceFrontier *DF = getAnalysisToUpdate<DominanceFrontier>();
if (DF)
DF->runOnFunction(*F);
}
return true;
}