Changes in directory llvm/lib/CodeGen/SelectionDAG:
SelectionDAG.cpp updated: 1.354 -> 1.355
---
Log message:
Trivial patch to speed up legalizing common i64 constants.
---
Diffs of the changes: (+7 -0)
SelectionDAG.cpp | 7 +++++++
1 files changed, 7 insertions(+)
Index: llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
diff -u llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp:1.354
llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp:1.355
--- llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp:1.354 Tue Oct 17
16:14:32 2006
+++ llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp Tue Oct 17 16:47:13 2006
@@ -1234,6 +1234,13 @@
if (N2C && N2C->getValue() == 0)
return N2;
break;
+ case ISD::OR:
+ case ISD::XOR:
+ // (X ^| 0) -> X. This commonly occurs when legalizing i64 values, so it's
+ // worth handling here.
+ if (N2C && N2C->getValue() == 0)
+ return N1;
+ break;
case ISD::FP_ROUND_INREG:
if (cast<VTSDNode>(N2)->getVT() == VT) return N1; // Not actually
rounding.
break;
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