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Fold (fpext (load x)) -> (extload x)

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28130 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2006-05-05 21:34:35 +00:00
parent 903236468c
commit e564dbb51c
1 changed files with 14 additions and 0 deletions
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14
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -2413,6 +2413,20 @@ SDOperand DAGCombiner::visitFP_EXTEND(SDNode *N) {
// fold (fp_extend c1fp) -> c1fp // fold (fp_extend c1fp) -> c1fp
if (N0CFP) if (N0CFP)
return DAG.getNode(ISD::FP_EXTEND, VT, N0); return DAG.getNode(ISD::FP_EXTEND, VT, N0);
// fold (fpext (load x)) -> (fpext (fpround (extload x)))
if (N0.getOpcode() == ISD::LOAD && N0.hasOneUse() &&
(!AfterLegalize||TLI.isOperationLegal(ISD::EXTLOAD, N0.getValueType()))) {
SDOperand ExtLoad = DAG.getExtLoad(ISD::EXTLOAD, VT, N0.getOperand(0),
N0.getOperand(1), N0.getOperand(2),
N0.getValueType());
CombineTo(N, ExtLoad);
CombineTo(N0.Val, DAG.getNode(ISD::FP_ROUND, N0.getValueType(), ExtLoad),
ExtLoad.getValue(1));
return SDOperand(N, 0); // Return N so it doesn't get rechecked!
}
return SDOperand(); return SDOperand();
} }