Index

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:

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 0 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)

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: