AMDGPU: Slightly restructure m0 init code

This will allow using another operation to produce the glue in a
future change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@375447 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 15 insertions, 13 deletions

diff --git a/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.cpp b/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.cpp
index f768a10a720..f330bd7ebcd 100644
--- a/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.cpp
+++ b/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.cpp
@@ -172,8 +172,9 @@ private:
 
   MachineSDNode *buildSMovImm64(SDLoc &DL, uint64_t Val, EVT VT) const;
 
-  SDNode *glueCopyToM0LDSInit(SDNode *N) const;
+  SDNode *glueCopyToOp(SDNode *N, SDValue NewChain, SDValue Glue) const;
   SDNode *glueCopyToM0(SDNode *N, SDValue Val) const;
+  SDNode *glueCopyToM0LDSInit(SDNode *N) const;
 
   const TargetRegisterClass *getOperandRegClass(SDNode *N, unsigned OpNo) const;
   virtual bool SelectADDRVTX_READ(SDValue Addr, SDValue &Base, SDValue &Offset);
@@ -585,19 +586,10 @@ const TargetRegisterClass *AMDGPUDAGToDAGISel::getOperandRegClass(SDNode *N,
   }
 }
 
-SDNode *AMDGPUDAGToDAGISel::glueCopyToM0(SDNode *N, SDValue Val) const {
-  const SITargetLowering& Lowering =
-    *static_cast<const SITargetLowering*>(getTargetLowering());
-
-  assert(N->getOperand(0).getValueType() == MVT::Other && "Expected chain");
-
-  SDValue M0 = Lowering.copyToM0(*CurDAG, N->getOperand(0), SDLoc(N),
-                                 Val);
-
-  SDValue Glue = M0.getValue(1);
-
+SDNode *AMDGPUDAGToDAGISel::glueCopyToOp(SDNode *N, SDValue NewChain,
+                                         SDValue Glue) const {
   SmallVector <SDValue, 8> Ops;
-  Ops.push_back(M0); // Replace the chain.
+  Ops.push_back(NewChain); // Replace the chain.
   for (unsigned i = 1, e = N->getNumOperands(); i != e; ++i)
     Ops.push_back(N->getOperand(i));
 
@@ -605,6 +597,16 @@ SDNode *AMDGPUDAGToDAGISel::glueCopyToM0(SDNode *N, SDValue Val) const {
   return CurDAG->MorphNodeTo(N, N->getOpcode(), N->getVTList(), Ops);
 }
 
+SDNode *AMDGPUDAGToDAGISel::glueCopyToM0(SDNode *N, SDValue Val) const {
+  const SITargetLowering& Lowering =
+    *static_cast<const SITargetLowering*>(getTargetLowering());
+
+  assert(N->getOperand(0).getValueType() == MVT::Other && "Expected chain");
+
+  SDValue M0 = Lowering.copyToM0(*CurDAG, N->getOperand(0), SDLoc(N), Val);
+  return glueCopyToOp(N, M0, M0.getValue(1));
+}
+
 SDNode *AMDGPUDAGToDAGISel::glueCopyToM0LDSInit(SDNode *N) const {
   unsigned AS = cast<MemSDNode>(N)->getAddressSpace();
   if (AS == AMDGPUAS::LOCAL_ADDRESS) {