From 06c24350a92dff027cf1b4ddb91704cb82d976ae Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Tue, 11 Apr 2006 01:21:43 +0000
Subject: [PATCH] Move some return-handling code from lowerarguments to the
 ISD::RET handling stuff. No functionality change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27577 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/PowerPC/PPCISelLowering.cpp | 29 ++++++++------------------
 1 file changed, 9 insertions(+), 20 deletions(-)

diff --git a/lib/Target/PowerPC/PPCISelLowering.cpp b/lib/Target/PowerPC/PPCISelLowering.cpp
index 135b1792767..f7643b84073 100644
--- a/lib/Target/PowerPC/PPCISelLowering.cpp
+++ b/lib/Target/PowerPC/PPCISelLowering.cpp
@@ -880,12 +880,21 @@ SDOperand PPCTargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) {
       unsigned ArgReg = MVT::isInteger(ArgVT) ? PPC::R3 : PPC::F1;
       Copy = DAG.getCopyToReg(Op.getOperand(0), ArgReg, Op.getOperand(1),
                               SDOperand());
+      
+      // If we haven't noted the R3/F1 are live out, do so now.
+      if (DAG.getMachineFunction().liveout_empty())
+        DAG.getMachineFunction().addLiveOut(ArgReg);
       break;
     }
     case 3:
       Copy = DAG.getCopyToReg(Op.getOperand(0), PPC::R3, Op.getOperand(2), 
                               SDOperand());
       Copy = DAG.getCopyToReg(Copy, PPC::R4, Op.getOperand(1),Copy.getValue(1));
+      // If we haven't noted the R3+R4 are live out, do so now.
+      if (DAG.getMachineFunction().liveout_empty()) {
+        DAG.getMachineFunction().addLiveOut(PPC::R3);
+        DAG.getMachineFunction().addLiveOut(PPC::R4);
+      }
       break;
     }
     return DAG.getNode(PPCISD::RET_FLAG, MVT::Other, Copy, Copy.getValue(1));
@@ -1249,26 +1258,6 @@ PPCTargetLowering::LowerArguments(Function &F, SelectionDAG &DAG) {
     }
   }
   
-  // Finally, inform the code generator which regs we return values in.
-  switch (getValueType(F.getReturnType())) {
-    default: assert(0 && "Unknown type!");
-    case MVT::isVoid: break;
-    case MVT::i1:
-    case MVT::i8:
-    case MVT::i16:
-    case MVT::i32:
-      MF.addLiveOut(PPC::R3);
-      break;
-    case MVT::i64:
-      MF.addLiveOut(PPC::R3);
-      MF.addLiveOut(PPC::R4);
-      break;
-    case MVT::f32:
-    case MVT::f64:
-      MF.addLiveOut(PPC::F1);
-      break;
-  }
-  
   return ArgValues;
 }