Path: utzoo!news-server.csri.toronto.edu!cs.utexas.edu!usc!apple!stevec
From: stevec@Apple.COM (Steve Christensen)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Can I count on any alignment from NewHandle or NewPtr?
Message-ID: <50238@apple.Apple.COM>
Date: 14 Mar 91 01:05:03 GMT
References: <3588@ux.acs.umn.edu>
Organization: Apple Computer Inc., Cupertino, CA
Lines: 18

In article <3588@ux.acs.umn.edu> dhoyt@vx.acs.umn.edu writes:
>  Can I count on any sort of alignment from the mac memory manager?  Or do I
>have to roll my own by allocating n-1 more bytes than I really need?
>  Also, is there any guarentee on stack alignment?  I'm trying to build a
>garbage collector for MacApp/C++ and it would be faster if I could rely on
>alignment.

As I recall, heap blocks are word aligned on 68000 Macs and are long word
aligned on 68020 and 68030 Macs.  The best you can hope for is word alignment
on the stack since both word- and long word-sized values are stored on the
stack...

steve

-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  Steve Christensen			Never hit a man with glasses.
  stevec@apple.com			Hit him with a baseball bat.