<html lang="en"> <head> <title>Altera Nios II Built-in Functions - Using the GNU Compiler Collection (GCC)</title> <meta http-equiv="Content-Type" content="text/html"> <meta name="description" content="Using the GNU Compiler Collection (GCC)"> <meta name="generator" content="makeinfo 4.13"> <link title="Top" rel="start" href="index.html#Top"> <link rel="up" href="Target-Builtins.html#Target-Builtins" title="Target Builtins"> <link rel="prev" href="Alpha-Built_002din-Functions.html#Alpha-Built_002din-Functions" title="Alpha Built-in Functions"> <link rel="next" href="ARC-Built_002din-Functions.html#ARC-Built_002din-Functions" title="ARC Built-in Functions"> <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> <!-- Copyright (C) 1988-2015 Free Software Foundation, Inc. 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They all generate the machine instruction that is part of the name. <pre class="example"> int __builtin_ldbio (volatile const void *) int __builtin_ldbuio (volatile const void *) int __builtin_ldhio (volatile const void *) int __builtin_ldhuio (volatile const void *) int __builtin_ldwio (volatile const void *) void __builtin_stbio (volatile void *, int) void __builtin_sthio (volatile void *, int) void __builtin_stwio (volatile void *, int) void __builtin_sync (void) int __builtin_rdctl (int) void __builtin_wrctl (int, int) </pre> <p>The following built-in functions are always available. They all generate a Nios II Custom Instruction. The name of the function represents the types that the function takes and returns. The letter before the <code>n</code> is the return type or void if absent. The <code>n</code> represents the first parameter to all the custom instructions, the custom instruction number. The two letters after the <code>n</code> represent the up to two parameters to the function. <p>The letters represent the following data types: <dl> <dt><code><no letter></code><dd><code>void</code> for return type and no parameter for parameter types. <br><dt><code>i</code><dd><code>int</code> for return type and parameter type <br><dt><code>f</code><dd><code>float</code> for return type and parameter type <br><dt><code>p</code><dd><code>void *</code> for return type and parameter type </dl> <p>And the function names are: <pre class="example"> void __builtin_custom_n (void) void __builtin_custom_ni (int) void __builtin_custom_nf (float) void __builtin_custom_np (void *) void __builtin_custom_nii (int, int) void __builtin_custom_nif (int, float) void __builtin_custom_nip (int, void *) void __builtin_custom_nfi (float, int) void __builtin_custom_nff (float, float) void __builtin_custom_nfp (float, void *) void __builtin_custom_npi (void *, int) void __builtin_custom_npf (void *, float) void __builtin_custom_npp (void *, void *) int __builtin_custom_in (void) int __builtin_custom_ini (int) int __builtin_custom_inf (float) int __builtin_custom_inp (void *) int __builtin_custom_inii (int, int) int __builtin_custom_inif (int, float) int __builtin_custom_inip (int, void *) int __builtin_custom_infi (float, int) int __builtin_custom_inff (float, float) int __builtin_custom_infp (float, void *) int __builtin_custom_inpi (void *, int) int __builtin_custom_inpf (void *, float) int __builtin_custom_inpp (void *, void *) float __builtin_custom_fn (void) float __builtin_custom_fni (int) float __builtin_custom_fnf (float) float __builtin_custom_fnp (void *) float __builtin_custom_fnii (int, int) float __builtin_custom_fnif (int, float) float __builtin_custom_fnip (int, void *) float __builtin_custom_fnfi (float, int) float __builtin_custom_fnff (float, float) float __builtin_custom_fnfp (float, void *) float __builtin_custom_fnpi (void *, int) float __builtin_custom_fnpf (void *, float) float __builtin_custom_fnpp (void *, void *) void * __builtin_custom_pn (void) void * __builtin_custom_pni (int) void * __builtin_custom_pnf (float) void * __builtin_custom_pnp (void *) void * __builtin_custom_pnii (int, int) void * __builtin_custom_pnif (int, float) void * __builtin_custom_pnip (int, void *) void * __builtin_custom_pnfi (float, int) void * __builtin_custom_pnff (float, float) void * __builtin_custom_pnfp (float, void *) void * __builtin_custom_pnpi (void *, int) void * __builtin_custom_pnpf (void *, float) void * __builtin_custom_pnpp (void *, void *) </pre> </body></html>