diff --git a/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp b/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
--- a/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
+++ b/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
@@ -353,10 +353,6 @@
                                                uint64_t Address,
                                                const MCDisassembler *Decoder);
 
-static DecodeStatus decodeRVCInstrSImm(MCInst &Inst, unsigned Insn,
-                                       uint64_t Address,
-                                       const MCDisassembler *Decoder);
-
 static DecodeStatus decodeRVCInstrRdSImm(MCInst &Inst, unsigned Insn,
                                          uint64_t Address,
                                          const MCDisassembler *Decoder);
@@ -387,17 +383,6 @@
   return MCDisassembler::Success;
 }
 
-static DecodeStatus decodeRVCInstrSImm(MCInst &Inst, unsigned Insn,
-                                       uint64_t Address,
-                                       const MCDisassembler *Decoder) {
-  uint64_t SImm6 =
-      fieldFromInstruction(Insn, 12, 1) << 5 | fieldFromInstruction(Insn, 2, 5);
-  DecodeStatus Result = decodeSImmOperand<6>(Inst, SImm6, Address, Decoder);
-  (void)Result;
-  assert(Result == MCDisassembler::Success && "Invalid immediate");
-  return MCDisassembler::Success;
-}
-
 static DecodeStatus decodeRVCInstrRdSImm(MCInst &Inst, unsigned Insn,
                                          uint64_t Address,
                                          const MCDisassembler *Decoder) {
diff --git a/llvm/lib/Target/RISCV/RISCVInstrInfoC.td b/llvm/lib/Target/RISCV/RISCVInstrInfoC.td
--- a/llvm/lib/Target/RISCV/RISCVInstrInfoC.td
+++ b/llvm/lib/Target/RISCV/RISCVInstrInfoC.td
@@ -611,7 +611,6 @@
 def C_NOP_HINT : RVInst16CI<0b000, 0b01, (outs), (ins simm6nonzero:$imm),
                             "c.nop", "$imm">, Sched<[WriteNop]> {
   let Inst{6-2} = imm{4-0};
-  let DecoderMethod = "decodeRVCInstrSImm";
 }
 
 def C_ADDI_HINT_IMM_ZERO : RVInst16CI<0b000, 0b01, (outs GPRNoX0:$rd_wb),