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C/C++ COMPILER->Function Calling Conventions->Introduction

The way that a function is called and returns is its calling convention.  The Crossware ARM C compiler supports three calling conventions:

__cdecl	This is the default calling convention.
__fastcall	This is the calling convention used when the /Gr option is used.
__stdcall	This is the calling convention used when the /Gz option is used.

Individual functions can also be declared using the __cdecl, __fastcall and __stdcall qualifiers to override the command line option.

The three calling conventions are described below.