From: Diego Novillo <dnovillo@redhat.com>
To: Michael Matz <matz@suse.de>
Cc: Andrew Macleod <amacleod@redhat.com>, gcc mailing list <gcc@gcc.gnu.org>
Subject: Re: [tree-ssa] Out of SSA status and issues
Date: Tue, 13 May 2003 12:42:00 -0000 [thread overview]
Message-ID: <1052829751.27232.220.camel@frodo.toronto.redhat.com> (raw)
In-Reply-To: <Pine.LNX.4.44.0305131105500.15564-100000@wotan.suse.de>
On Tue, 2003-05-13 at 05:07, Michael Matz wrote:
> An indirect reference is not a copy. I don't know if tree-ssa thinks it
> is, but it definitely shouldn't.
>
Why?
1. foo()
2. {
3. int i, *p;
4.
5. p = malloc();
6. i = *p;
7. return i + 9;
8. }
I see nothing wrong in replacing 'i + 9' with '*p + 9'. It would
probably not be efficient, but I can't see it being wrong.
Not that tree-ssa will do anything with this code, the default
type-based aliasing is too conservative, but PTA may disambiguate this.
Diego.
next prev parent reply other threads:[~2003-05-13 12:42 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-05-12 14:42 Andrew MacLeod
2003-05-12 15:38 ` Diego Novillo
2003-05-12 15:57 ` Andrew MacLeod
2003-05-12 16:05 ` Michael Matz
2003-05-12 16:10 ` Andrew MacLeod
2003-05-12 16:16 ` law
2003-05-12 17:08 ` law
2003-05-12 17:12 ` Andrew MacLeod
2003-05-12 17:26 ` law
2003-05-12 18:57 ` Andrew MacLeod
2003-05-13 9:07 ` Michael Matz
2003-05-13 12:42 ` Diego Novillo [this message]
2003-05-13 12:50 ` Andrew MacLeod
2003-05-13 13:05 ` Diego Novillo
2003-05-13 13:29 ` Andrew MacLeod
2003-05-13 13:57 ` Diego Novillo
2003-05-13 12:57 ` Michael Matz
2003-05-13 13:11 ` Diego Novillo
2003-05-13 13:18 ` Andrew MacLeod
2003-05-14 17:19 ` Jan Vroonhof
2003-05-14 18:05 ` Andrew MacLeod
2003-05-14 18:33 ` Diego Novillo
2003-05-14 19:11 ` Daniel Berlin
2003-05-13 15:01 ` Daniel Berlin
2003-05-13 12:33 ` Diego Novillo
2003-05-13 12:49 ` Andrew MacLeod
2003-05-13 12:58 ` Diego Novillo
2003-05-13 13:17 Richard Kenner
2003-05-13 13:27 ` Diego Novillo
2003-05-13 13:40 ` Michael Matz
2003-05-13 15:08 ` Michael S. Zick
2003-05-13 13:42 Richard Kenner
2003-05-13 15:23 Richard Kenner
2003-05-13 18:50 ` Geoff Keating
2003-05-13 23:28 ` Michael S. Zick
2003-05-17 17:19 ` Michael S. Zick
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