[llvm-commits] CVS: llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp

[Chris Lattner]

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;