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LSL (immediate)

Logical Shift Left (immediate).

This instruction is an alias of UBFM.

The equivalent instruction is UBFM Wd, Wn, #(-shift MOD 32), #(31-shift).

Syntax

LSL Wd, Wn, #shift ; 32-bit

LSL Xd, Xn, #shift ; 64-bit

Where:

Wd
Is the 32-bit name of the general-purpose destination register.
Wn
Is the 32-bit name of the general-purpose source register.
shift

Depends on the instruction variant:

32-bit general registers
Is the shift amount, in the range 0 to 31.
64-bit general registers
Is the shift amount, in the range 0 to 63.
Xd
Is the 64-bit name of the general-purpose destination register.
Xn
Is the 64-bit name of the general-purpose source register.

Operation

Logical Shift Left (immediate) shifts a register value left by an immediate number of bits, shifting in zeros, and writes the result to the destination register.

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

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