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Can we declare an assembly function as "inline"?

Allen Lee
Genius 3770 points

Hi,all

Is it feasible to declare a function as inline and then realize this function using assembly code?But it will cause the compiler error.

Such as:

//Declartion:

inline int func(void);

main()

{

……

     int a = func();

……

}

And func() is realized in another asm file.

Allen

  • 0
    Intellectual 700 points

    Allen,

    No, that's not possible. When you declare a function inline, the pre-processor substitutes the C code in wherever that function is called. It's kind of like a macro. If there was assembly substituted in there, the compiler wouldn't know what to do with it.

    If you want the performance of assembly while using the C language and inline functions, try using intrinsics.

     

  • 0 in reply to Luke Postema
    Genius 3770 points

    hi Luke,

    Thanks for you suggestion.

    It seems a feasible  way to realize the inline function by intrinsics in order to reduce the function-call-cost.

    Allen

     

  • 0 in reply to Allen Lee
    Genius 3770 points

    But the another problem is that if make an inline function by intrinsics, the performance will be cut down compared to the pure assembly function because you cannot allocate intrinsics in parallel.

  • 0 in reply to Allen Lee
    TI__Expert 4280 points

    You can't put them in parallel, but the compiler will look for opportunites to put the generated instructions in parallel.