Reapply blindly reverted 55898: Implement FRAME_TO_ARGS_OFFSET for x86-64

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55954 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 7 insertions, 11 deletions

diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 26895bb..93ffb41 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -258,8 +258,7 @@ X86TargetLowering::X86TargetLowering(X86TargetMachine &TM)
   }
   // X86 ret instruction may pop stack.
   setOperationAction(ISD::RET             , MVT::Other, Custom);
-  if (!Subtarget->is64Bit())
-    setOperationAction(ISD::EH_RETURN       , MVT::Other, Custom);
+  setOperationAction(ISD::EH_RETURN       , MVT::Other, Custom);
 
   // Darwin ABI issue.
   setOperationAction(ISD::ConstantPool    , MVT::i32  , Custom);
@@ -325,7 +324,8 @@ X86TargetLowering::X86TargetLowering(X86TargetMachine &TM)
     setExceptionSelectorRegister(X86::EDX);
   }
   setOperationAction(ISD::FRAME_TO_ARGS_OFFSET, MVT::i32, Custom);
-  
+  setOperationAction(ISD::FRAME_TO_ARGS_OFFSET, MVT::i64, Custom);
+
   setOperationAction(ISD::TRAMPOLINE, MVT::Other, Custom);
 
   setOperationAction(ISD::TRAP, MVT::Other, Legal);
@@ -5593,19 +5593,15 @@ SDValue X86TargetLowering::LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) {
   // Depths > 0 not supported yet!
   if (cast<ConstantSDNode>(Op.getOperand(0))->getValue() > 0)
     return SDValue();
-    
+
   SDValue RetAddrFI = getReturnAddressFrameIndex(DAG);
-  return DAG.getNode(ISD::SUB, getPointerTy(), RetAddrFI, 
+  return DAG.getNode(ISD::SUB, getPointerTy(), RetAddrFI,
                      DAG.getIntPtrConstant(!Subtarget->is64Bit() ? 4 : 8));
 }
 
 SDValue X86TargetLowering::LowerFRAME_TO_ARGS_OFFSET(SDValue Op,
-                                                       SelectionDAG &DAG) {
-  // Is not yet supported on x86-64
-  if (Subtarget->is64Bit())
-    return SDValue();
-  
-  return DAG.getIntPtrConstant(8);
+                                                     SelectionDAG &DAG) {
+  return DAG.getIntPtrConstant(Subtarget->is64Bit() ? 16 : 8);
 }
 
 SDValue X86TargetLowering::LowerEH_RETURN(SDValue Op, SelectionDAG &DAG)