CCMN (immediate) Conditional compare negative (immediate) This instruction sets the value of the condition flags to the result of the comparison of a register value and a negated immediate value if the condition is TRUE, and an immediate value otherwise. This instruction is a data-independent-time instruction as described in About PSTATE.DIT. 0 1 1 1 0 1 0 0 1 0 1 0 0 0 CCMN <Wn>, #<imm>, #<nzcv>, <cond> 1 CCMN <Xn>, #<imm>, #<nzcv>, <cond> let n : integer{} = UInt(Rn); let datasize : integer{} = 32 << UInt(sf); let condition : bits(4) = cond; var flags : bits(4) = nzcv; let imm : bits(datasize) = ZeroExtend{}(imm5); <Wn> Is the 32-bit name of the general-purpose source register, encoded in the "Rn" field. <imm> Is a five bit unsigned (positive) immediate encoded in the "imm5" field. <nzcv> Is the flag bit specifier, an immediate in the range 0 to 15, giving the alternative state for the 4-bit NZCV condition flags, encoded in the "nzcv" field. <cond> Is one of the standard conditions, encoded in the standard way, and cond <cond> 0000 EQ 0001 NE 0010 CS 0011 CC 0100 MI 0101 PL 0110 VS 0111 VC 1000 HI 1001 LS 1010 GE 1011 LT 1100 GT 1101 LE 1110 AL 1111 NV <Xn> Is the 64-bit name of the general-purpose source register, encoded in the "Rn" field. if ConditionHolds(condition) then let operand1 : bits(datasize) = X{}(n); let operand2 : bits(datasize) = imm; (-, flags) = AddWithCarry{datasize}(operand1, operand2, '0'); end; PSTATE.[N,Z,C,V] = flags; 2026-03-12 12:23:09 2025-09_rel_asl1