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Simplify r132022 based on Cameron's feedback. 

llvm-svn: 132071
This commit is contained in:
Evan Cheng 2011-05-25 18:17:13 +00:00
parent d72cc55fcc
commit 9605a698b0
1 changed files with 5 additions and 12 deletions
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17
llvm/lib/Transforms/Scalar/LoopUnswitch.cpp
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@ -919,18 +919,11 @@ void LoopUnswitch::RewriteLoopBodyWithConditionConstant(Loop *L, Value *LIC,
BasicBlock *Switch = SI->getParent();
BasicBlock *SISucc = SI->getSuccessor(DeadCase);
BasicBlock *Latch = L->getLoopLatch();
// If the DeadCase successor dominates all of the predecessors of the
// loop latch, then the transformation isn't safe since it will delete
// the predecessor edges to the latch.
if (Latch) {
bool DominateAll = true;
for (pred_iterator PI = pred_begin(Latch), PE = pred_end(Latch);
DominateAll && PI != PE; ++PI)
if (!DT->dominates(SISucc, *PI))
DominateAll = false;
if (DominateAll)
continue;
}
// If the DeadCase successor dominates the loop latch, then the
// transformation isn't safe since it will delete the sole predecessor edge
// to the latch.
if (Latch && DT->dominates(SISucc, Latch))
continue;
// FIXME: This is a hack. We need to keep the successor around
// and hooked up so as to preserve the loop structure, because