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CCMP (immediate)

Conditional Compare (immediate) sets the value of the condition flags to the result of the comparison of a register value and an immediate value if the condition is TRUE, and an immediate value otherwise.

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sf1111010010imm5cond10Rn0nzcv
op

32-bit (sf == 0)

CCMP <Wn>, #<imm>, #<nzcv>, <cond>

64-bit (sf == 1)

CCMP <Xn>, #<imm>, #<nzcv>, <cond>

integer n = UInt(Rn);
integer datasize = if sf == '1' then 64 else 32;
bits(4) flags = nzcv;
bits(datasize) imm = ZeroExtend(imm5, datasize);

Assembler Symbols

<Wn>

Is the 32-bit name of the first general-purpose source register, encoded in the "Rn" field.

<Xn>

Is the 64-bit name of the first 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 "cond" field in the standard way.

Operation

bits(datasize) operand1 = X[n];
bits(datasize) operand2;

if ConditionHolds(cond) then
    operand2 = NOT(imm);
    (-, flags) = AddWithCarry(operand1, operand2, '1');
PSTATE.<N,Z,C,V> = flags;

Operational information

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.
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