Changes in directory llvm/lib/CodeGen/SelectionDAG:
DAGCombiner.cpp updated: 1.193 -> 1.194
---
Log message:
fold (aext (and (trunc x), cst)) -> (and x, cst).
---
Diffs of the changes: (+15 -0)
DAGCombiner.cpp | 15 +++++++++++++++
1 files changed, 15 insertions(+)
Index: llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
diff -u llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:1.193
llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:1.194
--- llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:1.193 Thu Sep 21 01:17:39 2006
+++ llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp Thu Sep 21 01:40:43 2006
@@ -1897,6 +1897,21 @@
return DAG.getNode(ISD::TRUNCATE, VT, TruncOp);
return DAG.getNode(ISD::ANY_EXTEND, VT, TruncOp);
}
+
+ // fold (aext (and (trunc x), cst)) -> (and x, cst).
+ if (N0.getOpcode() == ISD::AND &&
+ N0.getOperand(0).getOpcode() == ISD::TRUNCATE &&
+ N0.getOperand(1).getOpcode() == ISD::Constant) {
+ SDOperand X = N0.getOperand(0).getOperand(0);
+ if (X.getValueType() < VT) {
+ X = DAG.getNode(ISD::ANY_EXTEND, VT, X);
+ } else if (X.getValueType() > VT) {
+ X = DAG.getNode(ISD::TRUNCATE, VT, X);
+ }
+ uint64_t Mask = cast<ConstantSDNode>(N0.getOperand(1))->getValue();
+ return DAG.getNode(ISD::AND, VT, X, DAG.getConstant(Mask, VT));
+ }
+
// fold (aext (load x)) -> (aext (truncate (extload x)))
if (N0.getOpcode() == ISD::LOAD && N0.hasOneUse() &&
(!AfterLegalize||TLI.isOperationLegal(ISD::EXTLOAD, N0.getValueType())))
{
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