Partial implementation of calling functions with byval arguments:

 *) The needed information is propagated to the DAG
 *) The X86-64 backend detects it and aborts


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41179 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 21 insertions, 1 deletions

diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 179c47a..f32e6f6 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -1378,7 +1378,27 @@ X86TargetLowering::LowerX86_64CCCCallTo(SDOperand Op, SelectionDAG &DAG,
         StackPtr = DAG.getRegister(getStackPtrReg(), getPointerTy());
       SDOperand PtrOff = DAG.getConstant(VA.getLocMemOffset(), getPointerTy());
       PtrOff = DAG.getNode(ISD::ADD, getPointerTy(), StackPtr, PtrOff);
-      MemOpChains.push_back(DAG.getStore(Chain, Arg, PtrOff, NULL, 0));
+
+      SDOperand FlagsOp = Op.getOperand(6+2*VA.getValNo());
+      unsigned Flags    = cast<ConstantSDNode>(FlagsOp)->getValue();
+      if (Flags & ISD::ParamFlags::ByVal) {
+        unsigned Align = 1 << ((Flags & ISD::ParamFlags::ByValAlign) >>
+                               ISD::ParamFlags::ByValAlignOffs);
+        unsigned  Size = (Flags & ISD::ParamFlags::ByValSize) >>
+            ISD::ParamFlags::ByValSizeOffs;
+
+        SDOperand AlignNode = DAG.getConstant(Align, MVT::i32);
+        SDOperand  SizeNode = DAG.getConstant(Size, MVT::i32);
+
+        assert(0 && "Not Implemented");
+
+        SDOperand Copy = DAG.getNode(ISD::MEMCPY, MVT::Other, Chain, PtrOff,
+                                     Arg, SizeNode, AlignNode);
+        MemOpChains.push_back(Copy);
+      }
+      else {
+        MemOpChains.push_back(DAG.getStore(Chain, Arg, PtrOff, NULL, 0));
+      }
     }
   }