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Fix sign_extend and zero_extend of promoted value types to expanded value 

types.  This occurs when casting short to long on PPC for example.

llvm-svn: 21072
This commit is contained in:
Chris Lattner 2005-04-03 23:41:52 +00:00
parent 629cdaea39
commit 4784489de2
1 changed files with 27 additions and 3 deletions
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30
llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -1785,9 +1785,21 @@ void SelectionDAGLegalize::ExpandOp(SDOperand Op, SDOperand &Lo, SDOperand &Hi){
break;
}
case ISD::SIGN_EXTEND: {
SDOperand In;
switch (getTypeAction(Node->getOperand(0).getValueType())) {
case Expand: assert(0 && "expand-expand not implemented yet!");
case Legal: In = LegalizeOp(Node->getOperand(0)); break;
case Promote:
In = PromoteOp(Node->getOperand(0));
// Emit the appropriate sign_extend_inreg to get the value we want.
In = DAG.getNode(ISD::SIGN_EXTEND_INREG, In.getValueType(), In,
Node->getOperand(0).getValueType());
break;
}
// The low part is just a sign extension of the input (which degenerates to
// a copy).
Lo = DAG.getNode(ISD::SIGN_EXTEND, NVT, LegalizeOp(Node->getOperand(0)));
Lo = DAG.getNode(ISD::SIGN_EXTEND, NVT, In);
// The high part is obtained by SRA'ing all but one of the bits of the lo
// part.
@ -1796,7 +1808,19 @@ void SelectionDAGLegalize::ExpandOp(SDOperand Op, SDOperand &Lo, SDOperand &Hi){
TLI.getShiftAmountTy()));
break;
}
case ISD::ZERO_EXTEND:
case ISD::ZERO_EXTEND: {
SDOperand In;
switch (getTypeAction(Node->getOperand(0).getValueType())) {
case Expand: assert(0 && "expand-expand not implemented yet!");
case Legal: In = LegalizeOp(Node->getOperand(0)); break;
case Promote:
In = PromoteOp(Node->getOperand(0));
// Emit the appropriate zero_extend_inreg to get the value we want.
In = DAG.getNode(ISD::ZERO_EXTEND_INREG, In.getValueType(), In,
Node->getOperand(0).getValueType());
break;
}
// The low part is just a zero extension of the input (which degenerates to
// a copy).
Lo = DAG.getNode(ISD::ZERO_EXTEND, NVT, LegalizeOp(Node->getOperand(0)));
@ -1804,7 +1828,7 @@ void SelectionDAGLegalize::ExpandOp(SDOperand Op, SDOperand &Lo, SDOperand &Hi){
// The high part is just a zero.
Hi = DAG.getConstant(0, NVT);
break;
}
// These operators cannot be expanded directly, emit them as calls to
// library functions.
case ISD::FP_TO_SINT: