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

[Chris Lattner]

Changes in directory llvm/lib/CodeGen/SelectionDAG:

LegalizeDAG.cpp updated: 1.204 -> 1.205
---
Log message:

Handle the trivial (but common) two-op case more efficiently


---
Diffs of the changes:  (+18 -11)

 LegalizeDAG.cpp |   29 ++++++++++++++++++-----------
 1 files changed, 18 insertions(+), 11 deletions(-)


Index: llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
diff -u llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp:1.204 llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp:1.205
--- llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp:1.204	Tue Nov  8 17:32:44 2005
+++ llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp	Wed Nov  9 12:48:57 2005
@@ -633,19 +633,26 @@
     }
     break;
   }
-  case ISD::TokenFactor: {
-    std::vector<SDOperand> Ops;
-    bool Changed = false;
-    // Legalize the operands
-    for (unsigned i = 0, e = Node->getNumOperands(); i != e; ++i) {
-      SDOperand Op = Node->getOperand(i);
-      Ops.push_back(LegalizeOp(Op));
-      Changed |= Ops[i] != Op;
+  case ISD::TokenFactor:
+    if (Node->getNumOperands() == 2) {
+      bool Changed = false;
+      SDOperand Op0 = LegalizeOp(Node->getOperand(0));
+      SDOperand Op1 = LegalizeOp(Node->getOperand(1));
+      if (Op0 != Node->getOperand(0) || Op1 != Node->getOperand(1))
+        Result = DAG.getNode(ISD::TokenFactor, MVT::Other, Op0, Op1);
+    } else {
+      std::vector<SDOperand> Ops;
+      bool Changed = false;
+      // Legalize the operands.
+      for (unsigned i = 0, e = Node->getNumOperands(); i != e; ++i) {
+        SDOperand Op = Node->getOperand(i);
+        Ops.push_back(LegalizeOp(Op));
+        Changed |= Ops[i] != Op;
+      }
+      if (Changed)
+        Result = DAG.getNode(ISD::TokenFactor, MVT::Other, Ops);
     }
-    if (Changed)
-      Result = DAG.getNode(ISD::TokenFactor, MVT::Other, Ops);
     break;
-  }
 
   case ISD::CALLSEQ_START:
   case ISD::CALLSEQ_END: