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Using R15 as an operand
If R15 (the PC) is used as an operand in a data processing instruction the register is
used directly.
The PC value will be the address of the instruction, plus 8 or 12 bytes due to instruction
prefetching. If the shift amount is specified in the instruction, the PC will be 8 bytes
ahead. If a register is used to specify the shift amount the PC will be 12 bytes ahead.
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