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Allow targets to custom expand shifts that are too large for their registers 

llvm-svn: 23173
This commit is contained in:
Chris Lattner 2005-08-31 19:01:53 +00:00
parent 0e6b11da03
commit 8a1a5f2818
1 changed files with 39 additions and 0 deletions
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39
llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -3101,6 +3101,19 @@ void SelectionDAGLegalize::ExpandOp(SDOperand Op, SDOperand &Lo, SDOperand &Hi){
break;
case ISD::SHL:
// If the target wants custom lowering, do so.
if (TLI.getOperationAction(ISD::SHL, VT) == TargetLowering::Custom) {
SDOperand Op = DAG.getNode(ISD::SHL, VT, Node->getOperand(0),
LegalizeOp(Node->getOperand(1)));
Op = TLI.LowerOperation(Op, DAG);
if (Op.Val) {
// Now that the custom expander is done, expand the result, which is
// still VT.
ExpandOp(Op, Lo, Hi);
break;
}
}
// If we can emit an efficient shift operation, do so now.
if (ExpandShift(ISD::SHL, Node->getOperand(0), Node->getOperand(1), Lo, Hi))
break;
@ -3117,6 +3130,19 @@ void SelectionDAGLegalize::ExpandOp(SDOperand Op, SDOperand &Lo, SDOperand &Hi){
break;
case ISD::SRA:
// If the target wants custom lowering, do so.
if (TLI.getOperationAction(ISD::SRA, VT) == TargetLowering::Custom) {
SDOperand Op = DAG.getNode(ISD::SRA, VT, Node->getOperand(0),
LegalizeOp(Node->getOperand(1)));
Op = TLI.LowerOperation(Op, DAG);
if (Op.Val) {
// Now that the custom expander is done, expand the result, which is
// still VT.
ExpandOp(Op, Lo, Hi);
break;
}
}
// If we can emit an efficient shift operation, do so now.
if (ExpandShift(ISD::SRA, Node->getOperand(0), Node->getOperand(1), Lo, Hi))
break;
@ -3132,6 +3158,19 @@ void SelectionDAGLegalize::ExpandOp(SDOperand Op, SDOperand &Lo, SDOperand &Hi){
Lo = ExpandLibCall("__ashrdi3", Node, Hi);
break;
case ISD::SRL:
// If the target wants custom lowering, do so.
if (TLI.getOperationAction(ISD::SRL, VT) == TargetLowering::Custom) {
SDOperand Op = DAG.getNode(ISD::SRL, VT, Node->getOperand(0),
LegalizeOp(Node->getOperand(1)));
Op = TLI.LowerOperation(Op, DAG);
if (Op.Val) {
// Now that the custom expander is done, expand the result, which is
// still VT.
ExpandOp(Op, Lo, Hi);
break;
}
}
// If we can emit an efficient shift operation, do so now.
if (ExpandShift(ISD::SRL, Node->getOperand(0), Node->getOperand(1), Lo, Hi))
break;