Changes in directory llvm/lib/CodeGen/SelectionDAG:
DAGCombiner.cpp updated: 1.63 -> 1.64
---
Log message:
Only transform (sext (truncate x)) -> (sextinreg x) if before legalize or
if the target supports the resultant sextinreg
---
Diffs of the changes: (+3 -1)
DAGCombiner.cpp | 4 +++-
1 files changed, 3 insertions(+), 1 deletion(-)
Index: llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
diff -u llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:1.63
llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:1.64
--- llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:1.63 Wed Dec 7 01:11:03 2005
+++ llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp Wed Dec 7 12:02:05 2005
@@ -1547,7 +1547,9 @@
if (N0.getOpcode() == ISD::SEXTLOAD && VT == N0.getValueType())
return N0;
// fold (sext (truncate x)) -> (sextinreg x) iff x size == sext size.
- if (N0.getOpcode() == ISD::TRUNCATE && N0.getOperand(0).getValueType() == VT)
+ if (N0.getOpcode() == ISD::TRUNCATE && N0.getOperand(0).getValueType() ==
VT&&
+ (!AfterLegalize ||
+ TLI.isOperationLegal(ISD::SIGN_EXTEND_INREG, N0.getValueType())))
return DAG.getNode(ISD::SIGN_EXTEND_INREG, VT, N0.getOperand(0),
DAG.getValueType(N0.getValueType()));
// fold (sext (load x)) -> (sextload x)
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