Index: lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp =================================================================== --- lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp +++ lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp @@ -684,7 +684,9 @@ bool MatchingInlineAsm) { MCInst Inst; - switch (MatchInstructionImpl(Operands, Inst, ErrorInfo, MatchingInlineAsm)) { + auto Result = + MatchInstructionImpl(Operands, Inst, ErrorInfo, MatchingInlineAsm); + switch (Result) { default: break; case Match_Success: @@ -705,6 +707,20 @@ } return Error(ErrorLoc, "invalid operand for instruction"); } + } + + // Handle the case when the error message is of specific type + // other than the generic Match_InvalidOperand, and the + // corresponding // operand is missing. + if (Result > FIRST_TARGET_MATCH_RESULT_TY) { + SMLoc ErrorLoc = IDLoc; + if (ErrorInfo != ~0U && ErrorInfo >= Operands.size()) + return Error(ErrorLoc, "too few operands for instruction"); + } + + switch(Result) { + default: + break; case Match_InvalidImmXLen: if (isRV64()) { SMLoc ErrorLoc = ((RISCVOperand &)*Operands[ErrorInfo]).getStartLoc(); Index: test/MC/RISCV/rv32i-invalid.s =================================================================== --- test/MC/RISCV/rv32i-invalid.s +++ test/MC/RISCV/rv32i-invalid.s @@ -138,6 +138,7 @@ # Too few operands ori a0, a1 # CHECK: :[[@LINE]]:1: error: too few operands for instruction xor s2, s2 # CHECK: :[[@LINE]]:1: error: too few operands for instruction +jal a3 # CHECK: :[[@LINE]]:1: error: too few operands for instruction # Instruction not in the base ISA mul a4, ra, s0 # CHECK: :[[@LINE]]:1: error: instruction use requires an option to be enabled