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NEGS

Negate, setting flags.

This instruction is an alias of SUBS (shifted register).

The equivalent instruction is SUBS Wd, WZR, Wm {, shift #amount}.

Syntax

NEGS Wd, Wm{, shift #amount} ; 32-bit

NEGS Xd, Xm{, shift #amount} ; 64-bit

Where:

Wd
Is the 32-bit name of the general-purpose destination register.
Wm
Is the 32-bit name of the general-purpose source register.
amount

Depends on the instruction variant:

32-bit general registers
Is the shift amount, in the range 0 to 31, defaulting to 0.
64-bit general registers
Is the shift amount, in the range 0 to 63, defaulting to 0.
Xd
Is the 64-bit name of the general-purpose destination register.
Xm
Is the 64-bit name of the general-purpose source register.
shift
Is the optional shift type to be applied to the second source operand, defaulting to LSL, and can be one of LSL, LSR, or ASR.

Operation

Negate, setting flags, negates an optionally-shifted register value, and writes the result to the destination register. It updates the condition flags based on the result.

Rd = 0 - shift(Rm, amount), where R is either W or X.

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