Path: utzoo!utgpu!attcan!uunet!ncrlnk!ncr-sd!hp-sdd!hplabs!nsc!taux01!taux02!amos
From: amos@taux02.UUCP (Amos Shapir)
Newsgroups: comp.arch
Subject: Re: register save/restore
Message-ID: <234@taux02.UUCP>
Date: 3 Nov 88 15:22:18 GMT
References: <3300037@m.cs.uiuc.edu> <5938@killer.DALLAS.TX.US> <7580@aw.sei.cmu.edu> <2849@ima.ima.isc.com>
Organization: National Semiconductor (IC) Ltd, Israel Home of the 32532
Lines: 10
Hdate: 23 Heshvan 5749

I haven't seen anyone mention the idea of mixing caller-saves and callee-saves
methods: the caller hands to the callee a mask of live registers; the callee
ANDs this with a mask of the registers it uses and saves the registers whose
corresponding bits are set.  The mask the callee hands to the routines it calls
is the OR of these two masks. (I hope that's clear).
-- 
	Amos Shapir				amos@nsc.com
National Semiconductor (Israel) P.O.B. 3007, Herzlia 46104, Israel
Tel. +972 52 522261  TWX: 33691, fax: +972-52-558322
34 48 E / 32 10 N			(My other cpu is a NS32532)