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Add a simple missing fold to produce this: 

subfic r3, r2, 33

instead of this:

        subfic r2, r2, 32
        addi r3, r2, 1

llvm-svn: 25255
This commit is contained in:
Chris Lattner 2006-01-12 20:22:43 +00:00
parent c993d4522d
commit 3470b5dee6
1 changed files with 8 additions and 0 deletions
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8
llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -696,6 +696,14 @@ SDOperand DAGCombiner::visitADD(SDNode *N) {
return DAG.getNode(ISD::ADD, VT, N0.getOperand(0),
DAG.getConstant(N1C->getValue()+N01C->getValue(), VT));
}
// fold ((c1-A)+c2) -> (c1+c2)-A
if (N1C && N0.getOpcode() == ISD::SUB)
if (ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0.getOperand(0)))
return DAG.getNode(ISD::SUB, VT,
DAG.getConstant(N1C->getValue()+N0C->getValue(), VT),
N0.getOperand(1));
// fold ((0-A) + B) -> B-A
if (N0.getOpcode() == ISD::SUB && isa<ConstantSDNode>(N0.getOperand(0)) &&
cast<ConstantSDNode>(N0.getOperand(0))->isNullValue())