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Perform obvious constant arithmetic folding.

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llvm-svn: 63417
This commit is contained in:
Bill Wendling 2009-01-30 20:50:00 +00:00
parent 4f61644d4c
commit e74546802d
1 changed files with 8 additions and 6 deletions
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14
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -485,9 +485,10 @@ SDValue DAGCombiner::ReassociateOps(unsigned Opc, DebugLoc DL,
if (N0.getOpcode() == Opc && isa<ConstantSDNode>(N0.getOperand(1))) {
if (isa<ConstantSDNode>(N1)) {
// reassoc. (op (op x, c1), c2) -> (op x, (op c1, c2))
SDValue OpNode = DAG.getNode(Opc, N1.getDebugLoc(), VT,
N0.getOperand(1), N1);
AddToWorkList(OpNode.getNode());
SDValue OpNode =
DAG.FoldConstantArithmetic(Opc, VT,
cast<ConstantSDNode>(N0.getOperand(1)),
cast<ConstantSDNode>(N1));
return DAG.getNode(Opc, DL, VT, N0.getOperand(0), OpNode);
} else if (N0.hasOneUse()) {
// reassoc. (op (op x, c1), y) -> (op (op x, y), c1) iff x+c1 has one use
@ -501,9 +502,10 @@ SDValue DAGCombiner::ReassociateOps(unsigned Opc, DebugLoc DL,
if (N1.getOpcode() == Opc && isa<ConstantSDNode>(N1.getOperand(1))) {
if (isa<ConstantSDNode>(N0)) {
// reassoc. (op c2, (op x, c1)) -> (op x, (op c1, c2))
SDValue OpNode = DAG.getNode(Opc, N1.getDebugLoc(), VT,
N1.getOperand(1), N0);
AddToWorkList(OpNode.getNode());
SDValue OpNode =
DAG.FoldConstantArithmetic(Opc, VT,
cast<ConstantSDNode>(N1.getOperand(1)),
cast<ConstantSDNode>(N0));
return DAG.getNode(Opc, DL, VT, N1.getOperand(0), OpNode);
} else if (N1.hasOneUse()) {
// reassoc. (op y, (op x, c1)) -> (op (op x, y), c1) iff x+c1 has one use