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UBFM

Unsigned bitfield move, with zeros to left and right.

This instruction is used by the aliases:

  • LSL (immediate).

  • LSR (immediate).

  • UBFIZ.

  • UBFX.

  • UXTB.

  • UXTH.

Syntax

UBFM  Wd, Wn, #immr, #imms    ; 32-bit general registers
UBFM  Xd, Xn, #immr, #imms    ; 64-bit general registers

Where:

Wd

Is the 32-bit name of the general-purpose destination register, in the range 0 to 31.

Wn

Is the 32-bit name of the general-purpose source register, in the range 0 to 31.

immr

The value depends on the instruction variant:

32-bit general registers

Is the right rotate amount, in the range 0 to 31.

64-bit general registers

Is the right rotate amount, in the range 0 to 63.

imms

The value depends on the instruction variant:

32-bit general registers

Is the leftmost bit number to be moved from the source, in the range 0 to 31.

64-bit general registers

Is the leftmost bit number to be moved from the source, in the range 0 to 63.

Xd

Is the 64-bit name of the general-purpose destination register, in the range 0 to 31.

Xn

Is the 64-bit name of the general-purpose source register, in the range 0 to 31.

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