How to compile inline C function with literal attributes with GCC?

Question

I have an inline function like this:

inline void func_1 (int a)
{
   if(a==1)
   {
      other_func1();
   }
   else
   {
      other_func2();
   }
}

and I use in the Main like this:

 int main()
 {
     func1(1);
     func1(42);

     return 0;
 }

I use GCC, I think, the compiled code look like this (in “source level”):

 int main()
 {
     other_func1()
     other_func2();

     return 0;
 }

Is it true or am I wrong?

If you're not sure what compiler generates, you can always use -S (and maybe -fverbose-asm for better readability) and check generated assembly. Result may be different for different compiler options and optimisation levels. — keltar
– keltar, Commented Jan 28, 2015 at 11:38

Paul R · Accepted Answer · 2015-01-28 11:36:03Z

2

Yes, in general gcc will optimise away dead code in inline functions when it can evaluate branches at compile-time. I use this construct a lot to allow optimised code to be generated for different use cases - somewhat like template instantiation in C++.

answered Jan 28, 2015 at 11:36

Paul R

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