I''m interested in writing some functions out in assembly, but I don''t know how much MSVC++ supports assembly. Is it possible to compile some asm files with something like MASM (I don''t know what compilers are out there) and call the functions from functions written with C++?

I forgot one other thing to mention. I''ll be making functions that access memory, but not hardware.

assembly is supported in msvc++. if masm supports PE/COFF object files then they can be linked into the executable. inline assembly is also supported in msvc++.

You can do inline assembly in MSVC with "__asm" command.

You can use MASM or TASM to compile your .asm files. Just add them as a custom build to your project.
Don't forget to make your asm functions PUBLIC and use an underscore for the asm function. Then declare the function in a C header file with __cdecl. If you use it in C++ don't forget extern "C". Here's a header example:

#ifndef __ASM_HEADER__#define __ASM_HEADER__//------------------------------------------------------#ifdef __cplusplusextern "C" {#endif//------------------------------------------------------extern long iPolygonCount;//------------------------------------------------------void __cdecl QuickSort();//------------------------------------------------------#ifdef __cplusplus}#endif//----------------------------------------------------------#endif  

(ps: have you already tried disassembling your C files. You can learn a lot from this)



Edited by - baskuenen on May 26, 2000 6:15:34 PM

Hey, if you are going to use assembly, do yourself a favor.. and try your best to use the inline assembler... using MASM, although makes large coding efforts easier, it complicates things greatly especially if you call anything from c++... (because of the stupid calling conventions... and getting them cooperate on a regular basis isn''t easy) in any case... use MASM only if you are doing a large function in asm.. use inline assembler for smaller jobs.. and you will be happier...

RanXacT

to add to ranxact''s post: keep in mind the stack frame overhead.


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