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Make sure that the node returned by SimplifySetCC is added to the worklist

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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
This commit is contained in:
Chris Lattner 2006-10-14 03:52:46 +00:00
parent 4c1984d9e8
commit 30f73e78bd
1 changed files with 5 additions and 0 deletions
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5
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -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