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NGC

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

This is an alias of SBC. This means:

  • The encodings in this description are named to match the encodings of SBC.
  • The description of SBC gives the operational pseudocode for this instruction.

313029282726252423222120191817161514131211109876543210
sf1011010000Rm00000011111Rd
opSRn

32-bit (sf == 0)

NGC <Wd>, <Wm>

is equivalent to

SBC <Wd>, WZR, <Wm>

and is always the preferred disassembly.

64-bit (sf == 1)

NGC <Xd>, <Xm>

is equivalent to

SBC <Xd>, XZR, <Xm>

and is always the preferred disassembly.

Assembler Symbols

<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.

Operation

The description of SBC gives the operational pseudocode for this instruction.

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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