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

[Chris Lattner]

Changes in directory llvm/lib/CodeGen/SelectionDAG:

LegalizeDAG.cpp updated: 1.261 -> 1.262
---
Log message:

If a target specified a stack pointer with setStackPointerRegisterToSaveRestore,
lower STACKSAVE/STACKRESTORE into a copy from/to that register.


---
Diffs of the changes:  (+21 -5)

 LegalizeDAG.cpp |   26 +++++++++++++++++++++-----
 1 files changed, 21 insertions(+), 5 deletions(-)


Index: llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
diff -u llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp:1.261 llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp:1.262
--- llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp:1.261	Thu Jan 12 20:50:02 2006
+++ llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp	Fri Jan 13 11:48:44 2006
@@ -1453,10 +1453,20 @@
       AddLegalizedOperand(SDOperand(Node, 1), Result.getValue(1));
       return Result.getValue(Op.ResNo);
     case TargetLowering::Expand:
-      Tmp1 = DAG.getNode(ISD::UNDEF, Node->getValueType(0));
-      AddLegalizedOperand(SDOperand(Node, 0), Tmp1);
-      AddLegalizedOperand(SDOperand(Node, 1), Node->getOperand(0));
-      return Op.ResNo ? Node->getOperand(0) : Tmp1;
+      // Expand to CopyFromReg if the target set 
+      // StackPointerRegisterToSaveRestore.
+      if (unsigned SP = TLI.getStackPointerRegisterToSaveRestore()) {
+        Tmp1 = DAG.getCopyFromReg(Node->getOperand(0), SP, 
+                                  Node->getValueType(0));
+        AddLegalizedOperand(SDOperand(Node, 0), Tmp1);
+        AddLegalizedOperand(SDOperand(Node, 1), Tmp1.getValue(1));
+        return Tmp1.getValue(Op.ResNo);
+      } else {
+        Tmp1 = DAG.getNode(ISD::UNDEF, Node->getValueType(0));
+        AddLegalizedOperand(SDOperand(Node, 0), Tmp1);
+        AddLegalizedOperand(SDOperand(Node, 1), Node->getOperand(0));
+        return Op.ResNo ? Node->getOperand(0) : Tmp1;
+      }
     }
     
   case ISD::STACKRESTORE:
@@ -1478,7 +1488,13 @@
     case TargetLowering::Legal:
       break;
     case TargetLowering::Expand:
-      Result = Tmp1;
+      // Expand to CopyToReg if the target set 
+      // StackPointerRegisterToSaveRestore.
+      if (unsigned SP = TLI.getStackPointerRegisterToSaveRestore()) {
+        Result = DAG.getCopyToReg(Tmp1, SP, Tmp2);
+      } else {
+        Result = Tmp1;
+      }
       break;
     }
     break;