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Emit BRCONDTWOWAY when possible.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21167 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2005-04-09 03:30:29 +00:00
parent 411e888c1b
commit e7ccd4acd2
1 changed files with 6 additions and 7 deletions
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13
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)]; MachineBasicBlock *Succ1MBB = FuncInfo.MBBMap[I.getSuccessor(1)];
SDOperand Cond = getValue(I.getCondition()); SDOperand Cond = getValue(I.getCondition());
if (Succ1MBB == NextBlock) { if (Succ1MBB == NextBlock) {
// If the condition is false, fall through. This means we should branch // If the condition is false, fall through. This means we should branch
// if the condition is true to Succ #0. // 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(), DAG.setRoot(DAG.getNode(ISD::BRCOND, MVT::Other, getRoot(),
Cond, DAG.getBasicBlock(Succ1MBB))); Cond, DAG.getBasicBlock(Succ1MBB)));
} else { } else {
// Neither edge is a fall through. If the comparison is true, jump to std::vector<SDOperand> Ops;
// Succ#0, otherwise branch unconditionally to succ #1. Ops.push_back(getRoot());
DAG.setRoot(DAG.getNode(ISD::BRCOND, MVT::Other, getRoot(), Ops.push_back(Cond);
Cond, DAG.getBasicBlock(Succ0MBB))); Ops.push_back(DAG.getBasicBlock(Succ0MBB));
DAG.setRoot(DAG.getNode(ISD::BR, MVT::Other, getRoot(), Ops.push_back(DAG.getBasicBlock(Succ1MBB));
DAG.getBasicBlock(Succ1MBB))); DAG.setRoot(DAG.getNode(ISD::BRCONDTWOWAY, MVT::Other, Ops));
} }
} }
} }