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Fold the add (ptr, offset) into ptr[offset] only if the offset is small enough. movwi and moviw allow value of 5-bits only (i.e. 32).

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73953 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Sanjiv Gupta 2009-06-23 07:10:19 +00:00
parent 8dfbe6c853
commit ae99227ef9
1 changed files with 4 additions and 2 deletions
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6
lib/Target/PIC16/PIC16ISelLowering.cpp
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@ -702,10 +702,12 @@ void PIC16TargetLowering::LegalizeAddress(SDValue Ptr, SelectionDAG &DAG,
if (Ptr.getOpcode() == ISD::ADD) {
SDValue OperLeft = Ptr.getOperand(0);
SDValue OperRight = Ptr.getOperand(1);
if (OperLeft.getOpcode() == ISD::Constant) {
if ((OperLeft.getOpcode() == ISD::Constant) &&
(dyn_cast<ConstantSDNode>(OperLeft)->getZExtValue() < 32 )) {
Offset = dyn_cast<ConstantSDNode>(OperLeft)->getZExtValue();
Ptr = OperRight;
} else if (OperRight.getOpcode() == ISD::Constant) {
} else if ((OperRight.getOpcode() == ISD::Constant) &&
(dyn_cast<ConstantSDNode>(OperRight)->getZExtValue() < 32 )){
Offset = dyn_cast<ConstantSDNode>(OperRight)->getZExtValue();
Ptr = OperLeft;
}