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UBFM

Unsigned Bitfield Move.

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.

Wn

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

immr

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

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.

Xn

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

Usage

Unsigned Bitfield Move copies any number of low-order bits from a source register into the same number of adjacent bits at any position in the destination register, with zeros in the upper and lower bits.

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