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#### 9.5.1 Options

`-mcpu=`processor[`-`sirevision]
  This option specifies the target processor. The optional sirevision is not used in assembler. It's here such that GCC can easily pass down its `-mcpu=` option. The assembler will issue an error message if an attempt is made to assemble an instruction which will not execute on the target processor. The following processor names are recognized: `bf512`, `bf514`, `bf516`, `bf518`, `bf522`, `bf523`, `bf524`, `bf525`, `bf526`, `bf527`, `bf531`, `bf532`, `bf533`, `bf534`, `bf535` (not implemented yet), `bf536`, `bf537`, `bf538`, `bf539`, `bf542`, `bf542m`, `bf544`, `bf544m`, `bf547`, `bf547m`, `bf548`, `bf548m`, `bf549`, `bf549m`, and `bf561`.