Perform obvious constant arithmetic folding.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63417 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index e507b89..d639ec0 100644
--- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -485,9 +485,10 @@
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 @@
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