AMD64 ABI compatibility

Dave Korn
Mon Jul 9 19:58:00 GMT 2007

On 09 July 2007 20:48, Nicolas Alt wrote:

> Hi!
> On the AMD64 / x86-64Bit architecture, some arguments of a functions
> are passed using registers, but there seem to be two different
> conventions out there. The standard ABI uses 6 registers, but
> Microsoft compilers use only 4. Because of that, code compiled with
> gcc cannot call code compiled with a MS compiler without an ugly
> wrapper.
> Have there been any efforts to make gcc do function calls the MS way?
> I guess this would be an important feature for mingw on AMD64.

  Does -mregparm=4 do what you want?  

Can't think of a witty .sigline today....

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