[RISCV] Remove a couple of custom instruction decoders (NFC) (#158483)

These instructions can be decoded automatically.

1 files changed, 24 insertions, 40 deletions

diff --git a/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp b/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
index fb5a35d..ff07122 100644
--- a/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
+++ b/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
@@ -194,12 +194,24 @@ static DecodeStatus DecodeFPR128RegisterClass(MCInst &Inst, uint32_t RegNo,
   return MCDisassembler::Success;
 }
 
+static DecodeStatus DecodeGPRX1RegisterClass(MCInst &Inst,
+                                             const MCDisassembler *Decoder) {
+  Inst.addOperand(MCOperand::createReg(RISCV::X1));
+  return MCDisassembler::Success;
+}
+
 static DecodeStatus DecodeSPRegisterClass(MCInst &Inst,
                                           const MCDisassembler *Decoder) {
   Inst.addOperand(MCOperand::createReg(RISCV::X2));
   return MCDisassembler::Success;
 }
 
+static DecodeStatus DecodeGPRX5RegisterClass(MCInst &Inst,
+                                             const MCDisassembler *Decoder) {
+  Inst.addOperand(MCOperand::createReg(RISCV::X5));
+  return MCDisassembler::Success;
+}
+
 static DecodeStatus DecodeGPRNoX0RegisterClass(MCInst &Inst, uint32_t RegNo,
                                                uint64_t Address,
                                                const MCDisassembler *Decoder) {
@@ -408,6 +420,18 @@ static DecodeStatus decodeVMaskReg(MCInst &Inst, uint32_t RegNo,
   return MCDisassembler::Success;
 }
 
+static DecodeStatus decodeImmThreeOperand(MCInst &Inst,
+                                          const MCDisassembler *Decoder) {
+  Inst.addOperand(MCOperand::createImm(3));
+  return MCDisassembler::Success;
+}
+
+static DecodeStatus decodeImmFourOperand(MCInst &Inst,
+                                         const MCDisassembler *Decoder) {
+  Inst.addOperand(MCOperand::createImm(4));
+  return MCDisassembler::Success;
+}
+
 template <unsigned N>
 static DecodeStatus decodeUImmOperand(MCInst &Inst, uint32_t Imm,
                                       int64_t Address,
@@ -579,46 +603,6 @@ static DecodeStatus decodeXqccmpRlistS0(MCInst &Inst, uint32_t Imm,
   return decodeZcmpRlist(Inst, Imm, Address, Decoder);
 }
 
-static DecodeStatus decodeCSSPushPopchk(MCInst &Inst, uint16_t Insn,
-                                        uint64_t Address,
-                                        const MCDisassembler *Decoder) {
-  uint32_t Rs1 = fieldFromInstruction(Insn, 7, 5);
-  [[maybe_unused]] DecodeStatus Result =
-      DecodeGPRX1X5RegisterClass(Inst, Rs1, Address, Decoder);
-  assert(Result == MCDisassembler::Success && "Invalid register");
-  return MCDisassembler::Success;
-}
-
-static DecodeStatus decodeXTHeadMemPair(MCInst &Inst, uint32_t Insn,
-                                        uint64_t Address,
-                                        const MCDisassembler *Decoder) {
-  DecodeStatus S = MCDisassembler::Success;
-  uint32_t Rd1 = fieldFromInstruction(Insn, 7, 5);
-  uint32_t Rs1 = fieldFromInstruction(Insn, 15, 5);
-  uint32_t Rd2 = fieldFromInstruction(Insn, 20, 5);
-  uint32_t UImm2 = fieldFromInstruction(Insn, 25, 2);
-  if (!Check(S, DecodeGPRRegisterClass(Inst, Rd1, Address, Decoder)))
-    return MCDisassembler::Fail;
-  if (!Check(S, DecodeGPRRegisterClass(Inst, Rd2, Address, Decoder)))
-    return MCDisassembler::Fail;
-  if (!Check(S, DecodeGPRRegisterClass(Inst, Rs1, Address, Decoder)))
-    return MCDisassembler::Fail;
-  [[maybe_unused]] DecodeStatus Result =
-      decodeUImmOperand<2>(Inst, UImm2, Address, Decoder);
-  assert(Result == MCDisassembler::Success && "Invalid immediate");
-
-  // Disassemble the final operand which is implicit.
-  unsigned Opcode = Inst.getOpcode();
-  bool IsWordOp = (Opcode == RISCV::TH_LWD || Opcode == RISCV::TH_LWUD ||
-                   Opcode == RISCV::TH_SWD);
-  if (IsWordOp)
-    Inst.addOperand(MCOperand::createImm(3));
-  else
-    Inst.addOperand(MCOperand::createImm(4));
-
-  return S;
-}
-
 #include "RISCVGenDisassemblerTables.inc"
 
 namespace {