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Simplify this code; switch lowering shouldn't produce cases 

which trivially fold away.

llvm-svn: 106765
This commit is contained in:
Dan Gohman 2010-06-24 17:08:31 +00:00
parent 963b1c142e
commit 8a84cd57ae
1 changed files with 4 additions and 12 deletions
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16
llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
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@ -1424,18 +1424,10 @@ void SelectionDAGBuilder::visitSwitchCase(CaseBlock &CB,
MVT::Other, getControlRoot(), Cond,
DAG.getBasicBlock(CB.TrueBB));
// If the branch was constant folded, fix up the CFG.
if (BrCond.getOpcode() == ISD::BR) {
SwitchBB->removeSuccessor(CB.FalseBB);
} else {
// Otherwise, go ahead and insert the false branch.
if (BrCond == getControlRoot())
SwitchBB->removeSuccessor(CB.TrueBB);
if (CB.FalseBB != NextBlock)
BrCond = DAG.getNode(ISD::BR, dl, MVT::Other, BrCond,
DAG.getBasicBlock(CB.FalseBB));
}
// Insert the false branch.
if (CB.FalseBB != NextBlock)
BrCond = DAG.getNode(ISD::BR, dl, MVT::Other, BrCond,
DAG.getBasicBlock(CB.FalseBB));
DAG.setRoot(BrCond);
}