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

[Chris Lattner]

Changes in directory llvm/lib/CodeGen/SelectionDAG:

LegalizeDAG.cpp updated: 1.390 -> 1.391
---
Log message:

Allow targets to custom lower expanded BIT_CONVERT's


---
Diffs of the changes:  (+15 -2)

 LegalizeDAG.cpp |   17 +++++++++++++++--
 1 files changed, 15 insertions(+), 2 deletions(-)


Index: llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
diff -u llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp:1.390 llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp:1.391
--- llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp:1.390	Fri Sep  1 13:17:58 2006
+++ llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp	Fri Sep  8 19:20:27 2006
@@ -4457,8 +4457,21 @@
     break;
     
   case ISD::BIT_CONVERT: {
-    SDOperand Tmp = ExpandBIT_CONVERT(Node->getValueType(0), 
-                                      Node->getOperand(0));
+    SDOperand Tmp;
+    if (TLI.getOperationAction(ISD::BIT_CONVERT, VT) == TargetLowering::Custom){
+      // If the target wants to, allow it to lower this itself.
+      switch (getTypeAction(Node->getOperand(0).getValueType())) {
+      case Expand: assert(0 && "cannot expand FP!");
+      case Legal:   Tmp = LegalizeOp(Node->getOperand(0)); break;
+      case Promote: Tmp = PromoteOp (Node->getOperand(0)); break;
+      }
+      Tmp = TLI.LowerOperation(DAG.getNode(ISD::BIT_CONVERT, VT, Tmp), DAG);
+    }
+
+    // Turn this into a load/store pair by default.
+    if (Tmp.Val == 0)
+      Tmp = ExpandBIT_CONVERT(Node->getValueType(0), Node->getOperand(0));
+    
     ExpandOp(Tmp, Lo, Hi);
     break;
   }