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Conditional Compare Negative (register) 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.
31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
sf | 0 | 1 | 1 | 1 | 0 | 1 | 0 | 0 | 1 | 0 | Rm | cond | 0 | 0 | Rn | 0 | nzcv | ||||||||||||||
op |
integer n = UInt(Rn);
integer m = UInt(Rm);
integer datasize = if sf == '1' then 64 else 32;
boolean sub_op = (op == '1');
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. |
<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. |
<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. |
bits(datasize) operand1 = X[n];
bits(datasize) operand2 = X[m];
bit carry_in = '0';
if ConditionHolds(cond) then
(condition) then
if sub_op then
operand2 = NOT(operand2);
carry_in = '1';
(-, flags) = AddWithCarry(operand1, operand2, '0');
(operand1, operand2, carry_in);
PSTATE.<N,Z,C,V> = flags;
If PSTATE.DIT is 1:
Internal version only: isa v30.41, AdvSIMD v27.08, pseudocode r8p5_00bet2_rc5, sve v8.5-00bet10_rc5
; Build timestamp: 2019-03-28T072019-03-28T06:1434
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