Changes in directory llvm/lib/CodeGen/SelectionDAG:
DAGCombiner.cpp updated: 1.188 -> 1.189
---
Log message:
Fold the full generality of (any_extend (truncate x))
---
Diffs of the changes: (+9 -3)
DAGCombiner.cpp | 12 +++++++++---
1 files changed, 9 insertions(+), 3 deletions(-)
Index: llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
diff -u llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:1.188
llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:1.189
--- llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:1.188 Wed Sep 20 01:19:26 2006
+++ llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp Wed Sep 20 01:29:17 2006
@@ -1858,9 +1858,15 @@
N0.getOpcode() == ISD::SIGN_EXTEND)
return DAG.getNode(N0.getOpcode(), VT, N0.getOperand(0));
- // fold (aext (truncate x)) -> x iff x size == zext size.
- if (N0.getOpcode() == ISD::TRUNCATE && N0.getOperand(0).getValueType() == VT)
- return N0.getOperand(0);
+ // fold (aext (truncate x))
+ if (N0.getOpcode() == ISD::TRUNCATE) {
+ SDOperand TruncOp = N0.getOperand(0);
+ if (TruncOp.getValueType() == VT)
+ return TruncOp; // x iff x size == zext size.
+ if (TruncOp.getValueType() > VT)
+ return DAG.getNode(ISD::TRUNCATE, VT, TruncOp);
+ return DAG.getNode(ISD::ANY_EXTEND, VT, TruncOp);
+ }
// 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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