The cost of function call

Hi

I'm working on an improved math library.
We are developing for linux and windows.
I have a problem with inline assembly codes
I can inline an assembly code, but I have to write all the codes 2 times 
to be able to compile with gcc and MSVC.
I know about NASM, but with NASM I loose the inline functions.
How do you guys do it? Writing every asm peace 2 or more times?
Sacrifice the inline or add one more function call to the assembly function?
How expensive is a function call today?
Is there a way to convert Microsoft MASM code to GCC GAS?

Best Regards
Peter Balogh


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