Using the GNU Compiler Collection (GCC): Nios II Function Attributes

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#### 6.31.21 Nios II Function Attributes

These function attributes are supported by the Nios II back end:

`target (options)`

  As discussed in Common Function Attributes, this attribute allows specification of target-specific compilation options.

  When compiling for Nios II, the following options are allowed:

  ‘`custom-insn=N`’
  ‘`no-custom-insn`’

    Each ‘`custom-insn=N`’ attribute locally enables use of a custom instruction with encoding N when generating code that uses insn. Similarly, ‘`no-custom-insn`’ locally inhibits use of the custom instruction insn. These target attributes correspond to the `-mcustom-insn=N` and `-mno-custom-insn` command-line options, and support the same set of insn keywords. See Nios II Options, for more information.

  ‘`custom-fpu-cfg=name`’

    This attribute corresponds to the `-mcustom-fpu-cfg=name` command-line option, to select a predefined set of custom instructions named name. See Nios II Options, for more information.