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NGCS

Negate with Carry, setting flags, negates the sum of a register value and the value of NOT (Carry flag), and writes the result to the destination register. It updates the condition flags based on the result.

This is an alias of SBCS. This means:

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

313029282726252423222120191817161514131211109876543210
sf1111010000Rm00000011111Rd
opSRn

32-bit (sf == 0)

NGCS <Wd>, <Wm>

is equivalent to

SBCS <Wd>, WZR, <Wm>

and is always the preferred disassembly.

64-bit (sf == 1)

NGCS <Xd>, <Xm>

is equivalent to

SBCS <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 SBCS 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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