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Emit BRCONDTWOWAY when possible. 

llvm-svn: 21167
This commit is contained in:
Chris Lattner 2005-04-09 03:30:29 +00:00
parent fd98678a8a
commit 8a98c7f337
1 changed files with 6 additions and 7 deletions
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13
llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
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@ -430,7 +430,6 @@ void SelectionDAGLowering::visitBr(BranchInst &I) {
MachineBasicBlock *Succ1MBB = FuncInfo.MBBMap[I.getSuccessor(1)];
SDOperand Cond = getValue(I.getCondition());
if (Succ1MBB == NextBlock) {
// If the condition is false, fall through. This means we should branch
// if the condition is true to Succ #0.
@ -444,12 +443,12 @@ void SelectionDAGLowering::visitBr(BranchInst &I) {
DAG.setRoot(DAG.getNode(ISD::BRCOND, MVT::Other, getRoot(),
Cond, DAG.getBasicBlock(Succ1MBB)));
} else {
// Neither edge is a fall through. If the comparison is true, jump to
// Succ#0, otherwise branch unconditionally to succ #1.
DAG.setRoot(DAG.getNode(ISD::BRCOND, MVT::Other, getRoot(),
Cond, DAG.getBasicBlock(Succ0MBB)));
DAG.setRoot(DAG.getNode(ISD::BR, MVT::Other, getRoot(),
DAG.getBasicBlock(Succ1MBB)));
std::vector<SDOperand> Ops;
Ops.push_back(getRoot());
Ops.push_back(Cond);
Ops.push_back(DAG.getBasicBlock(Succ0MBB));
Ops.push_back(DAG.getBasicBlock(Succ1MBB));
DAG.setRoot(DAG.getNode(ISD::BRCONDTWOWAY, MVT::Other, Ops));
}
}
}