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ARM Compiler armasm User Guide : TST (immediate)

TST (immediate)

Test bits (immediate), setting the condition flags and discarding the result.

This instruction is an alias of ANDS (immediate).

Syntax

TST Wn, #imm ; 32-bit general registers

Equivalent to ANDS WZR, Wn, #imm.

TST Xn, #imm ; 64-bit general registers

Equivalent to ANDS XZR, Xn, #imm.

Where:

Wn

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

Xn

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

imm

Is the bitmask immediate.

Operation

Rn AND imm, where R is either W or X.

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