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add a couple of missing folds

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26724 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-03-13 06:26:26 +00:00
parent 8f4191d619
commit 79dbea5ab4
1 changed files with 12 additions and 0 deletions
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12
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -2102,6 +2102,18 @@ SDOperand DAGCombiner::visitFP_ROUND(SDNode *N) {
// fold (fp_round c1fp) -> c1fp
if (N0CFP)
return DAG.getNode(ISD::FP_ROUND, VT, N0);
// fold (fp_round (fp_extend x)) -> x
if (N0.getOpcode() == ISD::FP_EXTEND && VT == N0.getOperand(0).getValueType())
return N0.getOperand(0);
// fold (fp_round (copysign X, Y)) -> (copysign (fp_round X), Y)
if (N0.getOpcode() == ISD::FCOPYSIGN && N0.Val->hasOneUse()) {
SDOperand Tmp = DAG.getNode(ISD::FP_ROUND, VT, N0.getOperand(0));
AddToWorkList(Tmp.Val);
return DAG.getNode(ISD::FCOPYSIGN, VT, Tmp, N0.getOperand(1));
}
return SDOperand();
}