diff options
| author | Chris Lattner <sabre@nondot.org> | 2006-10-14 03:52:46 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2006-10-14 03:52:46 +0000 |
| commit | 30f73e78bd92f9815647ef8e3d29dd355f29432c (patch) | |
| tree | 80da05f45635325ea76b66e267dd5b95b46f7111 /lib | |
| parent | 4c1984d9e81b685ab494f181cd85bc1063c91f32 (diff) | |
Make sure that the node returned by SimplifySetCC is added to the worklist
so that it can be deleted if unused.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30955 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index de858539c6..2ee98f0654 100644 --- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -1845,6 +1845,7 @@ SDOperand DAGCombiner::visitSELECT_CC(SDNode *N) { // Determine if the condition we're dealing with is constant SDOperand SCC = SimplifySetCC(TLI.getSetCCResultTy(), N0, N1, CC, false); + if (SCC.Val) AddToWorkList(SCC.Val); if (ConstantSDNode *SCCC = dyn_cast_or_null<ConstantSDNode>(SCC.Val)) { if (SCCC->getValue()) @@ -2660,6 +2661,8 @@ SDOperand DAGCombiner::visitBR_CC(SDNode *N) { // Use SimplifySetCC to simplify SETCC's. SDOperand Simp = SimplifySetCC(MVT::i1, CondLHS, CondRHS, CC->get(), false); + if (Simp.Val) AddToWorkList(Simp.Val); + ConstantSDNode *SCCC = dyn_cast_or_null<ConstantSDNode>(Simp.Val); // fold br_cc true, dest -> br dest (unconditional branch) @@ -2669,6 +2672,7 @@ SDOperand DAGCombiner::visitBR_CC(SDNode *N) { // fold br_cc false, dest -> unconditional fall through if (SCCC && SCCC->isNullValue()) return N->getOperand(0); + // fold to a simpler setcc if (Simp.Val && Simp.getOpcode() == ISD::SETCC) return DAG.getNode(ISD::BR_CC, MVT::Other, N->getOperand(0), @@ -3424,6 +3428,7 @@ SDOperand DAGCombiner::SimplifySelectCC(SDOperand N0, SDOperand N1, // Determine if the condition we're dealing with is constant SDOperand SCC = SimplifySetCC(TLI.getSetCCResultTy(), N0, N1, CC, false); + if (SCC.Val) AddToWorkList(SCC.Val); ConstantSDNode *SCCC = dyn_cast_or_null<ConstantSDNode>(SCC.Val); // fold select_cc true, x, y -> x |