Altera Nios II Custom Bedienungsanleitung PDF herunterladen (Seite 43)

January 2011 Altera Corporation Nios II Custom Instruction User Guide

B. Custom Instruction Built-in Functions

The Nios II

gcc

compiler,

nios2-elf-gcc

, is customized with built-in functions to

support custom instructions. This section lists the built-in functions.

f For more information about

gcc

built-in functions, refer to www.gnu.org.

Nios II custom instruction built-in functions have the following return types:

■

void

■

int

■

float

■ pointer

Built-in Functions that Return a Void Value

The following built-in functions return a void value:

■

void __builtin_custom_n (int n);

■

void __builtin_custom_ni (int n, int dataa);

■

void __builtin_custom_nf (int n, float dataa);

■

void __builtin_custom_np (int n, void *dataa);

■

void __builtin_custom_nii (int n, int dataa, int datab);

■

void __builtin_custom_nif (int n, int dataa, float datab);

■

void __builtin_custom_nip (int n, int dataa, void *datab);

■

void __builtin_custom_nfi (int n, float dataa, int datab);

■

void __builtin_custom_nff (int n, float dataa, float datab);

■

void __builtin_custom_nfp (int n, float dataa, void *datab);

■

void __builtin_custom_npi (int n, void *dataa, int datab);

■

void __builtin_custom_npf (int n, void *dataa, float datab);

■

void __builtin_custom_npp (int n, void *dataa, void *datab);

Built-in Functions that Return a Value of Type Int

The following built-in functions return a value of type

int

■

int __builtin_custom_in (int n);

■

int __builtin_custom_ini (int n, int dataa);

■

int __builtin_custom_inf (int n, float dataa);

■

int __builtin_custom_inp (int n, void *dataa);

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