[SystemZ] Use interlocked-access 1 instructions for CodeGen

...namely LOAD AND ADD, LOAD AND AND, LOAD AND OR and LOAD AND EXCLUSIVE OR.
LOAD AND ADD LOGICAL isn't really separately useful for LLVM.

I'll look at adding reusing the CC results in new year.

llvm-svn: 197985

1 files changed, 0 insertions, 14 deletions

diff --git a/llvm/lib/Target/SystemZ/SystemZISelDAGToDAG.cpp b/llvm/lib/Target/SystemZ/SystemZISelDAGToDAG.cpp
index 567a6b7451f..d95361eed15 100644
--- a/llvm/lib/Target/SystemZ/SystemZISelDAGToDAG.cpp
+++ b/llvm/lib/Target/SystemZ/SystemZISelDAGToDAG.cpp
@@ -1093,20 +1093,6 @@ SDNode *SystemZDAGToDAGISel::Select(SDNode *Node) {
     }
     break;
 
-  case ISD::ATOMIC_LOAD_SUB:
-    // Try to convert subtractions of constants to additions.
-    if (ConstantSDNode *Op2 = dyn_cast<ConstantSDNode>(Node->getOperand(2))) {
-      uint64_t Value = -Op2->getZExtValue();
-      EVT VT = Node->getValueType(0);
-      if (VT == MVT::i32 || isInt<32>(Value)) {
-        SDValue Ops[] = { Node->getOperand(0), Node->getOperand(1),
-                          CurDAG->getConstant(int32_t(Value), VT) };
-        Node = CurDAG->MorphNodeTo(Node, ISD::ATOMIC_LOAD_ADD,
-                                   Node->getVTList(), Ops, array_lengthof(Ops));
-      }
-    }
-    break;
-
   case SystemZISD::SELECT_CCMASK: {
     SDValue Op0 = Node->getOperand(0);
     SDValue Op1 = Node->getOperand(1);