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SUBS (immediate)

Subtract (immediate), setting flags.

This instruction is used by the alias CMP (immediate).

Syntax

SUBS Wd, Wn|WSP, #imm{, shift} ; 32-bit

SUBS Xd, Xn|SP, #imm{, shift} ; 64-bit

Where:

Wd
Is the 32-bit name of the general-purpose destination register.
Wn|WSP
Is the 32-bit name of the source general-purpose register or stack pointer.
Xd
Is the 64-bit name of the general-purpose destination register.
Xn|SP
Is the 64-bit name of the source general-purpose register or stack pointer.
imm
Is an unsigned immediate, in the range 0 to 4095.
shift
Is the optional left shift to apply to the immediate, defaulting to LSL #0, and can be either LSL #0 or LSL #12.

Operation

Subtract (immediate), setting flags, subtracts an optionally-shifted immediate value from a register value, and writes the result to the destination register. It updates the condition flags based on the result.

Rd = Rn - shift(imm), where R is either W or X.

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