From: Tom Tromey <tromey@redhat.com>
To: Bryce McKinlay <bryce@waitaki.otago.ac.nz>
Cc: Dan Nicolaescu <dann@godzilla.ics.uci.edu>,
java@gcc.gnu.org, gcc@gcc.gnu.org
Subject: Re: java aliasing rules
Date: Wed, 27 Mar 2002 16:45:00 -0000 [thread overview]
Message-ID: <87vgbhij40.fsf@creche.redhat.com> (raw)
In-Reply-To: Bryce McKinlay's message of "Thu, 28 Mar 2002 11:53:27 +1200"
>>>>> "Bryce" == Bryce McKinlay <bryce@waitaki.otago.ac.nz> writes:
Bryce> I implemented java_get_alias_set() by simply assigning a new
Bryce> alias set to every unique field, storing it in
Bryce> DECL_POINTER_ALIAS_SET for each FIELD_DECL. This managed to
Bryce> eliminate some redundant loads in my tests, but didn't cause
Bryce> any measurable improvements in benchmark scores so I didn't get
Bryce> too excited about it
This sounds like a nice approach.
My only question is how it handles the length field of an array.
Object[].length and Foo[].length can alias.
But int[].length and Object[].length cannot.
Similarly for the interior of arrays.
Maybe we could squeeze out some tiny percentage improvement by taking
this into account too?
Tom
next prev parent reply other threads:[~2002-03-28 0:45 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
2002-03-27 16:45 ` Tom Tromey [this message]
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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