>On Wed, 21 Jan 1998, Arnaud Blanchard wrote:
>
>> Now a question about GCC:
>> I think that GCC give parameters to functions, with the stack.
>> right ?
>> Is there a way to pass paramaters via register ? ( as CW with PPC ) ?
>
>Not a standard one. One of the standard things specified with a CPU is the
>subroutine calling procedure (*). Most all m68k programming environments,
>including NetBSD and MacOS, use parameters passed on the stack.
>
>Moto & IBM specified for teh PowerPC that the first 8 or so parameters are
>passed in registers, and that some registers must be preserved by
>subroutines and others don't have to be.
>
>Sorry.
>
>Take care,
>
>Bill
>
>(*) It's really specified as part of an ABI. I've never seen more than one
>parameter-passing standard per CPU. If you're using assembly language, you
>can, of course, use registers to your heart's content.

Pardon the digression, but the VAX supported two different parameter passing
standards, with assembly instructions (CALLS and CALLG) to implement each.  As
I recall the first passed parameters on the stack, the second specfied a pointer
to a block of memory that contained the parameters.

By the way, 1.3 has been a real pleasure to use (X11 and all).  Thank you

Peter


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Peter E. Midford                     Florida Scrub Jays
Zoology Department                    Social Learning and Animal Traditions
Birge Hall                              Cognitive Ethology
University of Wisconsin                  Scheme and Artificial Intelligence
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