[RISCV] Remove dead code from RISCVDAGToDAGISel::selectVSETVLI. NFC

vsetvli no longer has side effects so we don't need code for
handling INSTRINSIC_W_CHAIN.

diff --git a/llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp b/llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp
index e48c1a7..796ca84 100644 (file)
--- a/llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp
+++ b/llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp
@@ -530,23 +530,19 @@ void RISCVDAGToDAGISel::selectVSETVLI(SDNode *Node) {
   if (!Subtarget->hasVInstructions())
     return;
 
-  assert((Node->getOpcode() == ISD::INTRINSIC_W_CHAIN ||
-          Node->getOpcode() == ISD::INTRINSIC_WO_CHAIN) &&
-         "Unexpected opcode");
+  assert(Node->getOpcode() == ISD::INTRINSIC_WO_CHAIN && "Unexpected opcode");
 
   SDLoc DL(Node);
   MVT XLenVT = Subtarget->getXLenVT();
 
-  bool HasChain = Node->getOpcode() == ISD::INTRINSIC_W_CHAIN;
-  unsigned IntNoOffset = HasChain ? 1 : 0;
-  unsigned IntNo = Node->getConstantOperandVal(IntNoOffset);
+  unsigned IntNo = Node->getConstantOperandVal(0);
 
   assert((IntNo == Intrinsic::riscv_vsetvli ||
           IntNo == Intrinsic::riscv_vsetvlimax) &&
          "Unexpected vsetvli intrinsic");
 
   bool VLMax = IntNo == Intrinsic::riscv_vsetvlimax;
-  unsigned Offset = IntNoOffset + (VLMax ? 1 : 2);
+  unsigned Offset = (VLMax ? 1 : 2);
 
   assert(Node->getNumOperands() == Offset + 2 &&
          "Unexpected number of operands");
@@ -561,8 +557,6 @@ void RISCVDAGToDAGISel::selectVSETVLI(SDNode *Node) {
   SDValue VTypeIOp = CurDAG->getTargetConstant(VTypeI, DL, XLenVT);
 
   SmallVector<EVT, 2> VTs = {XLenVT};
-  if (HasChain)
-    VTs.push_back(MVT::Other);
 
   SDValue VLOperand;
   unsigned Opcode = RISCV::PseudoVSETVLI;
@@ -570,15 +564,13 @@ void RISCVDAGToDAGISel::selectVSETVLI(SDNode *Node) {
     VLOperand = CurDAG->getRegister(RISCV::X0, XLenVT);
     Opcode = RISCV::PseudoVSETVLIX0;
   } else {
-    VLOperand = Node->getOperand(IntNoOffset + 1);
+    VLOperand = Node->getOperand(1);
 
     if (auto *C = dyn_cast<ConstantSDNode>(VLOperand)) {
       uint64_t AVL = C->getZExtValue();
       if (isUInt<5>(AVL)) {
         SDValue VLImm = CurDAG->getTargetConstant(AVL, DL, XLenVT);
         SmallVector<SDValue, 3> Ops = {VLImm, VTypeIOp};
-        if (HasChain)
-          Ops.push_back(Node->getOperand(0));
         ReplaceNode(
             Node, CurDAG->getMachineNode(RISCV::PseudoVSETIVLI, DL, VTs, Ops));
         return;
@@ -587,8 +579,6 @@ void RISCVDAGToDAGISel::selectVSETVLI(SDNode *Node) {
   }
 
   SmallVector<SDValue, 3> Ops = {VLOperand, VTypeIOp};
-  if (HasChain)
-    Ops.push_back(Node->getOperand(0));
 
   ReplaceNode(Node, CurDAG->getMachineNode(Opcode, DL, VTs, Ops));
 }