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Change comments so everybody can understand them, hopefully. 

llvm-svn: 61405
This commit is contained in:
Dale Johannesen 2008-12-23 23:47:22 +00:00
parent e9988b661d
commit ee573fcefc
1 changed files with 2 additions and 2 deletions
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4
llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -1025,7 +1025,7 @@ SDValue DAGCombiner::visitADD(SDNode *N) {
return DAG.getNode(ISD::SUB, VT, N1.getOperand(0),
N1.getOperand(1).getOperand(0));
}
// fold (A+((B-A)+-C)) to (B+-C)
// fold (A+((B-A)+or-C)) to (B+or-C)
if ((N1.getOpcode() == ISD::SUB || N1.getOpcode() == ISD::ADD) &&
N1.getOperand(0).getOpcode() == ISD::SUB &&
N0 == N1.getOperand(0).getOperand(1)) {
@ -1178,7 +1178,7 @@ SDValue DAGCombiner::visitSUB(SDNode *N) {
// fold (A+B)-B -> A
if (N0.getOpcode() == ISD::ADD && N0.getOperand(1) == N1)
return N0.getOperand(0);
// fold ((A+(B+-C))-B) -> A+-C
// fold ((A+(B+or-C))-B) -> A+or-C
if (N0.getOpcode() == ISD::ADD &&
(N0.getOperand(1).getOpcode() == ISD::SUB ||
N0.getOperand(1).getOpcode() == ISD::ADD) &&