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From
SubjectRe: Where is it written?
Date
Followup to:  <200011110011.eAB0BbF244111@saturn.cs.uml.edu>
By author: "Albert D. Cahalan" <acahalan@cs.uml.edu>
In newsgroup: linux.dev.kernel
>
> Gee that looks old. Might there be better calling conventions
> for the Pentium 4 or Athlon? Memory latency, vector registers,
> and more direct access to floating-point registers may mean
> we ought to change the calling conventions. One would start
> with the kernel of course, because it stands alone.
>

The main win would be passing arguments in registers -- at least three
such registers could be used (%eax, %edx, %ecx) without increasing
register pressure. Doing this for nonvaradic functions probably would
be a win. Similarly, floating-point arguments and SSE arguments could
be passed in registers, and _Bool output (a C99 feature) could at
least theoretically be returned in a flag.

-hpa
--
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."
http://www.zytor.com/~hpa/puzzle.txt
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