From 6cbeb4d839a7fc465c651f0df0b090052cd87a5c Mon Sep 17 00:00:00 2001
From: Anton Korobeynikov <asl@math.spbu.ru>
Date: Wed, 21 Nov 2012 17:23:03 +0000
Subject: Add support for byval args. Patch by Job Noorman!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168439 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/MSP430/MSP430CallingConv.td   |  3 ++
 lib/Target/MSP430/MSP430ISelLowering.cpp | 60 +++++++++++++++++++++++---------
 2 files changed, 46 insertions(+), 17 deletions(-)

(limited to 'lib/Target')

diff --git a/lib/Target/MSP430/MSP430CallingConv.td b/lib/Target/MSP430/MSP430CallingConv.td
index ad27cc9122..b448cc4ed9 100644
--- a/lib/Target/MSP430/MSP430CallingConv.td
+++ b/lib/Target/MSP430/MSP430CallingConv.td
@@ -24,6 +24,9 @@ def RetCC_MSP430 : CallingConv<[
 // MSP430 Argument Calling Conventions
 //===----------------------------------------------------------------------===//
 def CC_MSP430 : CallingConv<[
+  // Pass by value if the byval attribute is given
+  CCIfByVal<CCPassByVal<2, 2>>,
+
   // Promote i8 arguments to i16.
   CCIfType<[i8], CCPromoteToType<i16>>,
 
diff --git a/lib/Target/MSP430/MSP430ISelLowering.cpp b/lib/Target/MSP430/MSP430ISelLowering.cpp
index fc677aec38..6b6a34824f 100644
--- a/lib/Target/MSP430/MSP430ISelLowering.cpp
+++ b/lib/Target/MSP430/MSP430ISelLowering.cpp
@@ -357,22 +357,34 @@ MSP430TargetLowering::LowerCCCArguments(SDValue Chain,
     } else {
       // Sanity check
       assert(VA.isMemLoc());
-      // Load the argument to a virtual register
-      unsigned ObjSize = VA.getLocVT().getSizeInBits()/8;
-      if (ObjSize > 2) {
-        errs() << "LowerFormalArguments Unhandled argument type: "
-             << EVT(VA.getLocVT()).getEVTString()
-             << "\n";
+
+      SDValue InVal;
+      ISD::ArgFlagsTy Flags = Ins[i].Flags;
+
+      if (Flags.isByVal()) {
+        int FI = MFI->CreateFixedObject(Flags.getByValSize(),
+                                        VA.getLocMemOffset(), true);
+        InVal = DAG.getFrameIndex(FI, getPointerTy());
+      } else {
+        // Load the argument to a virtual register
+        unsigned ObjSize = VA.getLocVT().getSizeInBits()/8;
+        if (ObjSize > 2) {
+            errs() << "LowerFormalArguments Unhandled argument type: "
+                << EVT(VA.getLocVT()).getEVTString()
+                << "\n";
+        }
+        // Create the frame index object for this incoming parameter...
+        int FI = MFI->CreateFixedObject(ObjSize, VA.getLocMemOffset(), true);
+
+        // Create the SelectionDAG nodes corresponding to a load
+        //from this parameter
+        SDValue FIN = DAG.getFrameIndex(FI, MVT::i16);
+        InVal = DAG.getLoad(VA.getLocVT(), dl, Chain, FIN,
+                            MachinePointerInfo::getFixedStack(FI),
+                            false, false, false, 0);
       }
-      // Create the frame index object for this incoming parameter...
-      int FI = MFI->CreateFixedObject(ObjSize, VA.getLocMemOffset(), true);
-
-      // Create the SelectionDAG nodes corresponding to a load
-      //from this parameter
-      SDValue FIN = DAG.getFrameIndex(FI, MVT::i16);
-      InVals.push_back(DAG.getLoad(VA.getLocVT(), dl, Chain, FIN,
-                                   MachinePointerInfo::getFixedStack(FI),
-                                   false, false, false, 0));
+
+      InVals.push_back(InVal);
     }
   }
 
@@ -498,9 +510,23 @@ MSP430TargetLowering::LowerCCCCallTo(SDValue Chain, SDValue Callee,
                                    StackPtr,
                                    DAG.getIntPtrConstant(VA.getLocMemOffset()));
 
+      SDValue MemOp;
+      ISD::ArgFlagsTy Flags = Outs[i].Flags;
+
+      if (Flags.isByVal()) {
+        SDValue SizeNode = DAG.getConstant(Flags.getByValSize(), MVT::i16);
+        MemOp = DAG.getMemcpy(Chain, dl, PtrOff, Arg, SizeNode,
+                              Flags.getByValAlign(),
+                              /*isVolatile*/false,
+                              /*AlwaysInline=*/true,
+                              MachinePointerInfo(),
+                              MachinePointerInfo());
+      } else {
+        MemOp = DAG.getStore(Chain, dl, Arg, PtrOff, MachinePointerInfo(),
+                             false, false, 0);
+      }
 
-      MemOpChains.push_back(DAG.getStore(Chain, dl, Arg, PtrOff,
-                                         MachinePointerInfo(),false, false, 0));
+      MemOpChains.push_back(MemOp);
     }
   }
 
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