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STDCALL or PASCAL??

Posted on 1997-04-18
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I have a bunch of Delphi DLLs that I will want to use from C++ Builder (I just got it so haven't done any testing yet).  They all use the PASCAL calling convention.  I know that the Win32 standard is STDCALL.

I read, a few years ago, that for Intel processors, the PASCAL calling convention is more efficient that the C (CDECL) calling convention (though I can't remember why)...I do know that STDCALL is just a variant of CDECL.

So...first question...will C++ Builder support the PASCAL calling convention?  Or should I change the DLLs to support the STDCALL convention?  And, was there any truth to what I'd read about the PASCAL and CDECL conventions??
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Question by:mheacock
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sperling earned 50 total points
ID: 1335457
C++Builder supports pascal calling convention.

When you create a 'pascal' or 'stdcall' function, the generated code for returning to the caller looks something like

RET 0008

This instruction both removes 8 bytes from stack, and returns to caller.

Using 'cdecl', the return instruction would simply be

RET

and then the caller would have to fix up the stack using another instruction. Therefore, 'pascal' and 'stdcall' are more efficient than 'cdecl'.

You won't notice this unless your function is called *very* frequently though.

Anyway, a good rule of thumb is to stick to 'stdcall' for your DLLs... This'll make life easier if/when someone other than yourself should need to use the DLL.

Regards,

Erik.
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