Syntax

TST Wn, Wm{, shift #amount} ; 32-bit general registers

Equivalent to ANDS WZR, Wn, Wm{, shift #amount}.

TST Xn, Xm{, shift #amount} ; 64-bit general registers

Equivalent to ANDS XZR, Xn, Xm{, shift #amount}.

Where:

Wn

Is the 32-bit name of the first general-purpose source register.

Wm

Is the 32-bit name of the second 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.

Xn

Is the 64-bit name of the first general-purpose source register.

Xm

Is the 64-bit name of the second general-purpose source register.

shift

Is the optional shift to be applied to the final source, defaulting to LSL, and can be one of LSL, LSR, ASR, or ROR.