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From: faustus@ucbcad.UUCP
Newsgroups: comp.arch
Subject: Re: Optimizing compiler's view on: no. of regs, aliasing, caller/callee save etc.
Message-ID: <1283@ucbcad.berkeley.edu>
Date: Sat, 21-Feb-87 21:42:46 EST
Article-I.D.: ucbcad.1283
Posted: Sat Feb 21 21:42:46 1987
Date-Received: Sun, 22-Feb-87 05:43:43 EST
References: <902@orcisi.UUCP>
Organization: CAD Group, U.C. Berkeley
Lines: 9

WRT the discussion about whether the caller or the callee should save
registers -- wouldn't the most efficient strategy be for the caller to
pass the callee a mask of which registers are currently in use (by
itself and previous functions)?  That way, the callee could AND its
mask with the caller's mask and save those registers, and OR its mask
and the caller's and pass that to any functions that it calls.  I think
this should prevent any unnecessary saving of registers.

	Wayne