Changes in directory llvm/lib/CodeGen/SelectionDAG:
DAGCombiner.cpp updated: 1.81 -> 1.82
---
Log message:
Add a simple missing fold to produce this:
subfic r3, r2, 33
instead of this:
subfic r2, r2, 32
addi r3, r2, 1
---
Diffs of the changes: (+8 -0)
DAGCombiner.cpp | 8 ++++++++
1 files changed, 8 insertions(+)
Index: llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
diff -u llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:1.81
llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:1.82
--- llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:1.81 Thu Jan 12 12:57:33 2006
+++ llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp Thu Jan 12 14:22:43 2006
@@ -696,6 +696,14 @@
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())
_______________________________________________
llvm-commits mailing list
llvm-commits@cs.uiuc.edu
http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits
