Can we declare an assembly function as "inline"?

Allen Lee

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

over 13 years ago

0 Luke Postema over 13 years ago

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 Allen Lee over 13 years ago 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 Allen Lee over 13 years ago 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 Paul Knueven over 13 years ago 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.

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Can we declare an assembly function as "inline"?