diff options
Diffstat (limited to 'lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp | 21 |
1 files changed, 17 insertions, 4 deletions
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp index 196d3bf39d..6299bc4b85 100644 --- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp +++ b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp @@ -1632,11 +1632,24 @@ void SelectionDAGLowering::visitSwitchCase(SelectionDAGISel::CaseBlock &CB) { } SDValue BrCond = DAG.getNode(ISD::BRCOND, MVT::Other, getControlRoot(), Cond, DAG.getBasicBlock(CB.TrueBB)); - if (CB.FalseBB == NextBlock) + + // If the branch was constant folded, fix up the CFG. + if (BrCond.getOpcode() == ISD::BR) { + if (!DisableCorrectBranchFolding) + CurMBB->removeSuccessor(CB.FalseBB); DAG.setRoot(BrCond); - else - DAG.setRoot(DAG.getNode(ISD::BR, MVT::Other, BrCond, - DAG.getBasicBlock(CB.FalseBB))); + } else { + // Otherwise, go ahead and insert the false branch. + if (BrCond == getControlRoot()) + if (!DisableCorrectBranchFolding) + CurMBB->removeSuccessor(CB.TrueBB); + + if (CB.FalseBB == NextBlock) + DAG.setRoot(BrCond); + else + DAG.setRoot(DAG.getNode(ISD::BR, MVT::Other, BrCond, + DAG.getBasicBlock(CB.FalseBB))); + } } /// visitJumpTable - Emit JumpTable node in the current MBB |