UBFX Unsigned bitfield extract This instruction copies a bitfield of <width> bits starting from bit position <lsb> in the source register to the least significant bits of the destination register, and sets destination bits above the bitfield to zero. UBFM 1 0 1 0 0 1 1 0 0 0 UBFX <Wd>, <Wn>, #<lsb>, #<width> UBFM <Wd>, <Wn>, #<lsb>, #(<lsb>+<width>-1) BFXPreferred(sf, opc[1], imms, immr) 1 1 UBFX <Xd>, <Xn>, #<lsb>, #<width> UBFM <Xd>, <Xn>, #<lsb>, #(<lsb>+<width>-1) BFXPreferred(sf, opc[1], imms, immr) <Wd> Is the 32-bit name of the general-purpose destination register, encoded in the "Rd" field. <Wn> Is the 32-bit name of the general-purpose source register, encoded in the "Rn" field. <lsb> For the "32-bit" variant: is the bit number of the lsb of the source bitfield, in the range 0 to 31. <lsb> For the "64-bit" variant: is the bit number of the lsb of the source bitfield, in the range 0 to 63. <width> For the "32-bit" variant: is the width of the bitfield, in the range 1 to 32-<lsb>. <width> For the "64-bit" variant: is the width of the bitfield, in the range 1 to 64-<lsb>. <Xd> Is the 64-bit name of the general-purpose destination register, encoded in the "Rd" field. <Xn> Is the 64-bit name of the general-purpose source register, encoded in the "Rn" field. 2026-03-12 12:23:09 2025-09_rel_asl1