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

6.35.22 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-insncommand-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=namecommand-line option, to select a predefined set of custom instructions named name. See Nios II Options, for more information.