-Oi: Inlining

OPTIMIZATIONS

Compilation unit

  -Oi[=(c<code Size>|OFF)]
  
  

< code Size>: Limit for inlining in code size

OFF: switching off inlining

None. If no < code Size> is specified, the compiler uses a default code size of 40 bytes

None

#pragma INLINE

This option enables inline expansion. If there is a #pragma INLINE before a function definition, all calls of this function are replaced by the code of this function, if possible.

Using the -Oi=c0 option switches off inlining. Functions marked with the #pragma INLINE are still inlined. To disable inlining, use the -Oi=OFF option.

  -Oi
  
  

  #pragma INLINE
  
  

  static void f(int i) {
  
  

    /* all calls of function f() are inlined */
  
  

    /* ... */
  
  

  }
  
  

The option extension [ =c<n>] signifies that all functions with a size smaller than <n> are inlined. For example, compiling with the option -oi=c100 enables inline expansion for all functions with a size smaller than 100 bytes.

The following functions are not inlined:

• functions with default arguments
• functions with labels inside
• functions with an open parameter list ( void f(int i,...);)
• functions with inline assembly statements
• functions using local static objects