3.15 Access to the inline barrel shifter in AArch32 state

The AArch32 arithmetic logic unit has a 32-bit barrel shifter that is capable of shift and rotate operations.

The second operand to many A32 and T32 data-processing and single register data-transfer instructions can be shifted, before the data-processing or data-transfer is executed, as part of the instruction. This supports, but is not limited to:

  • Scaled addressing.
  • Multiplication by an immediate value.
  • Constructing immediate values.

32-bit T32 instructions give almost the same access to the barrel shifter as A32 instructions.

16-bit T32 instructions only allow access to the barrel shifter using separate instructions.

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