From: Bryce McKinlay <bryce@waitaki.otago.ac.nz>
To: Dan Nicolaescu <dann@godzilla.ics.uci.edu>
Cc: java@gcc.gnu.org, gcc@gcc.gnu.org
Subject: Re: java aliasing rules
Date: Wed, 27 Mar 2002 15:54:00 -0000 [thread overview]
Message-ID: <3CA25B77.1000108@waitaki.otago.ac.nz> (raw)
In-Reply-To: <200203271143.aa05958@gremlin-relay.ics.uci.edu>
Dan Nicolaescu wrote:
>The more general question is if 2 COMPONENT_REFs that refer to classes
>that are in conflicting alias sets (ie alias_sets_conflict_p) alias in
>java. I have a hunch that this might be true, but I don't know enough
>about java to be sure.
>
Right - Aliasing in Java is very simple, because basically there isn't
any ;-). The only case we need to be careful about is with inheritance
when two fields in different classes might actually be the same (ie if
"class second extends first").
I implemented java_get_alias_set() by simply assigning a new alias set
to every unique field, storing it in DECL_POINTER_ALIAS_SET for each
FIELD_DECL. This managed to eliminate some redundant loads in my tests,
but didn't cause any measurable improvements in benchmark scores so I
didn't get too excited about it, and I didn't get around to submitting
the patch yet. I'll try it out later on your test case and see what
happens...
regards
Bryce.
next prev parent reply other threads:[~2002-03-27 23:54 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-03-27 11:43 Dan Nicolaescu
2002-03-27 13:53 ` Tom Tromey
2002-03-27 16:03 ` Dan Nicolaescu
2002-03-27 16:47 ` Tom Tromey
2002-03-27 20:00 ` Dan Nicolaescu
2002-03-27 15:54 ` Bryce McKinlay [this message]
2002-03-27 16:45 ` Tom Tromey
2002-03-28 22:02 ` Bryce McKinlay
2002-03-28 22:13 ` Richard Henderson
2002-03-28 22:15 ` Tom Tromey
2002-03-29 15:22 ` Bryce McKinlay
2002-03-29 16:26 ` Richard Henderson
2002-03-30 6:37 ` Jeff Sturm
2002-03-30 13:55 ` Richard Henderson
2002-03-30 15:04 ` Bryce McKinlay
2002-04-04 10:57 ` Jeff Sturm
2002-04-04 12:57 ` Andrew Haley
2002-04-04 14:20 ` Jeff Sturm
2002-04-04 17:04 ` Bryce McKinlay
2002-04-04 20:39 ` Jeff Sturm
2002-04-05 1:07 ` Bryce McKinlay
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