Messages in this thread | | | From | "H. Peter Anvin" <> | Subject | Re: Where is it written? | Date | 10 Nov 2000 17:06:41 -0800 |
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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.
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