Implement Promote for VAARG, and allow it to be custom promoted for people

who don't want the default behavior (Alpha).

llvm-svn: 25726

2 files changed, 12 insertions, 0 deletions

diff --git a/llvm/lib/Target/Alpha/AlphaISelLowering.cpp b/llvm/lib/Target/Alpha/AlphaISelLowering.cpp
index ac21b563b4b..6779b90bd3a 100644
--- a/llvm/lib/Target/Alpha/AlphaISelLowering.cpp
+++ b/llvm/lib/Target/Alpha/AlphaISelLowering.cpp
@@ -141,6 +141,7 @@ AlphaTargetLowering::AlphaTargetLowering(TargetMachine &TM) : TargetLowering(TM)
   setOperationAction(ISD::VAEND,   MVT::Other, Expand);
   setOperationAction(ISD::VACOPY,  MVT::Other, Custom);
   setOperationAction(ISD::VAARG,   MVT::Other, Custom);
+  setOperationAction(ISD::VAARG,   MVT::i32,   Custom);
 
   setStackPointerRegisterToSaveRestore(Alpha::R30);
 
@@ -691,3 +692,13 @@ SDOperand AlphaTargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) {
 
   return SDOperand();
 }
+
+SDOperand AlphaTargetLowering::CustomPromoteOperation(SDOperand Op, 
+                                                      SelectionDAG &DAG) {
+  assert(Op.getValueType() == MVT::i32 && 
+         Op.getOpcode() == ISD::VAARG &&
+         "Unknown node to custom promote!");
+  
+  // The code in LowerOperation already handles i32 vaarg
+  return LowerOperation(Op, DAG);
+}
diff --git a/llvm/lib/Target/Alpha/AlphaISelLowering.h b/llvm/lib/Target/Alpha/AlphaISelLowering.h
index 33f87ce8187..fcbaaac190c 100644
--- a/llvm/lib/Target/Alpha/AlphaISelLowering.h
+++ b/llvm/lib/Target/Alpha/AlphaISelLowering.h
@@ -62,6 +62,7 @@ namespace llvm {
     /// LowerOperation - Provide custom lowering hooks for some operations.
     ///
     virtual SDOperand LowerOperation(SDOperand Op, SelectionDAG &DAG);
+    virtual SDOperand CustomPromoteOperation(SDOperand Op, SelectionDAG &DAG);
 
     //Friendly names for dumps
     const char *getTargetNodeName(unsigned Opcode) const;