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Preserve dom info.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53089 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2008-07-03 07:04:22 +00:00
parent 70c09c54b1
commit 98260a474c
1 changed files with 15 additions and 0 deletions
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15
lib/Transforms/Scalar/LoopUnroll.cpp
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@ -55,6 +55,12 @@ namespace {
AU.addRequired<LoopInfo>(); AU.addRequired<LoopInfo>();
AU.addPreservedID(LCSSAID); AU.addPreservedID(LCSSAID);
AU.addPreserved<LoopInfo>(); 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. // Unroll the loop.
Function *F = L->getHeader()->getParent();
if (!UnrollLoop(L, Count, LI, &LPM)) if (!UnrollLoop(L, Count, LI, &LPM))
return false; 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; return true;
} }