NGC

Negate with carry

This instruction negates the sum of a register value and the value of NOT (Carry flag), and writes the result to the destination register.

Encoding: Not setting the condition flags

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
	1	0	1	1	0	1	0	0	0	0						0	0	0	0	0	0	1	1	1	1	1
sf	op	S									Rm											Rn					Rd

32-bit (sf == 0)

NGC <Wd>, <Wm>

Equivalent to: SBC <Wd>, WZR, <Wm>

64-bit (sf == 1)

NGC <Xd>, <Xm>

Equivalent to: SBC <Xd>, XZR, <Xm>

Explanations

<Wd>: Is the 32-bit name of the general-purpose destination register, encoded in the "Rd" field.
<Wm>: Is the 32-bit name of the general-purpose source register, encoded in the "Rm" field.
<Xd>: Is the 64-bit name of the general-purpose destination register, encoded in the "Rd" field.
<Xm>: Is the 64-bit name of the general-purpose source register, encoded in the "Rm" field.

Operational Notes

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.