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##### 9.28.2.3 Addressing Modes

`as` understands the following addressing modes for the SH. `R` n in the following refers to any of the numbered registers, but not the control registers.

`R` n
  Register direct
`@R` n
  Register indirect
`@-R` n
  Register indirect with pre-decrement
`@R` n`+`
  Register indirect with post-increment
`@(`disp`, R` n`)`
  Register indirect with displacement
`@(R0, R` n`)`
  Register indexed
`@(`disp`, GBR)`
  `GBR` offset
`@(R0, GBR)`
  GBR indexed
addr
`@(`disp`, PC)`
  PC relative address (for branch or for addressing memory). The `as` implementation allows you to use the simpler form addr anywhere a PC relative address is called for; the alternate form is supported for compatibility with other assemblers.
`#`imm
  Immediate data