Changes in directory llvm/lib/CodeGen/SelectionDAG:
DAGCombiner.cpp updated: 1.118 -> 1.119
---
Log message:
Fix CodeGen/Generic/2006-03-01-dagcombineinfloop.ll, an infinite loop
in the dag combiner on 176.gcc on x86.
---
Diffs of the changes: (+9 -4)
DAGCombiner.cpp | 13 +++++++++----
1 files changed, 9 insertions(+), 4 deletions(-)
Index: llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
diff -u llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:1.118
llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:1.119
--- llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:1.118 Wed Mar 1 13:55:35 2006
+++ llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp Wed Mar 1 15:47:21 2006
@@ -1018,14 +1018,19 @@
return N1;
// fold (and (any_ext V), c) -> (zero_ext V) if 'and' only clears top bits.
if (N1C && N0.getOpcode() == ISD::ANY_EXTEND) {
- unsigned InBits = MVT::getSizeInBits(N0.getOperand(0).getValueType());
+ unsigned InMask = MVT::getIntVTBitMask(N0.getOperand(0).getValueType());
if (TLI.MaskedValueIsZero(N0.getOperand(0),
- ~N1C->getValue() & ((1ULL << InBits)-1))) {
+ ~N1C->getValue() & InMask)) {
+ SDOperand Zext = DAG.getNode(ISD::ZERO_EXTEND, N0.getValueType(),
+ N0.getOperand(0));
+
+ // Replace uses of the AND with uses of the Zero extend node.
+ CombineTo(N, Zext);
+
// We actually want to replace all uses of the any_extend with the
// zero_extend, to avoid duplicating things. This will later cause this
// AND to be folded.
- CombineTo(N0.Val, DAG.getNode(ISD::ZERO_EXTEND, N0.getValueType(),
- N0.getOperand(0)));
+ CombineTo(N0.Val, Zext);
return SDOperand();
}
}
_______________________________________________
llvm-commits mailing list
llvm-commits@cs.uiuc.edu
http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits
