Index

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:

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

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: