CCMN (register) Conditional compare negative (register) This instruction sets the value of the condition flags to the result of the comparison of a register value and the inverse of another register value if the condition is TRUE, and an immediate value otherwise. If PSTATE.DIT is 1: The execution time of this instruction is independent of: The values of the data supplied in any of its registers. The values of the NZCV flags. The response of this instruction to asynchronous exceptions does not vary based on: The values of the data supplied in any of its registers. The values of the NZCV flags. 0 1 1 1 0 1 0 0 1 0 0 0 0 0 CCMN <Wn>, <Wm>, #<nzcv>, <cond> 1 CCMN <Xn>, <Xm>, #<nzcv>, <cond> constant integer n = UInt(Rn); constant integer m = UInt(Rm); constant integer datasize = 32 << UInt(sf); constant bits(4) condition = cond; bits(4) flags = nzcv; <Wn> Is the 32-bit name of the first general-purpose source register, encoded in the "Rn" field. <Wm> Is the 32-bit name of the second general-purpose source register, encoded in the "Rm" 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 first general-purpose source register, encoded in the "Rn" field. <Xm> Is the 64-bit name of the second general-purpose source register, encoded in the "Rm" field. if ConditionHolds(condition) then constant bits(datasize) operand1 = X[n, datasize]; constant bits(datasize) operand2 = X[m, datasize]; (-, flags) = AddWithCarry(operand1, operand2, '0'); PSTATE.<N,Z,C,V> = flags;