From: law@redhat.com
To: Zdenek Dvorak <rakdver@atrey.karlin.mff.cuni.cz>
Cc: Diego Novillo <dnovillo@redhat.com>, "gcc@gcc.gnu.org" <gcc@gcc.gnu.org>
Subject: Re: [tree-ssa] Lazy updating of stmt operands
Date: Thu, 11 Dec 2003 19:39:00 -0000 [thread overview]
Message-ID: <200312111938.hBBJcE3T024871@speedy.slc.redhat.com> (raw)
In-Reply-To: Your message of "Sun, 07 Dec 2003 18:46:22 +0100." <20031207174622.GA13528@atrey.karlin.mff.cuni.cz>
In message <20031207174622.GA13528@atrey.karlin.mff.cuni.cz>, Zdenek Dvorak wri
tes:
>1) Merge_blocks. The natural way (for virtual operands, the only way) of
> getting rid of the degenerated phi nodes in the second block is to copy
> propagate the set implied by the phi node. Since cfg cleanup should
> be fast, I don't like scanning of all statements as implied by
> compute_immediate_uses.
Before spending a lot of time worrying about this, I would first look into
why the combination of the dominator optimizer and DCE doesn't kill such
PHI nodes.
While I'd like to have some generic code to optimize away useless PHIs, in
practice I've haven't found the need.
jeff
next prev parent reply other threads:[~2003-12-11 19:38 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-12-07 16:22 Zdenek Dvorak
2003-12-07 17:14 ` Diego Novillo
2003-12-07 17:28 ` Zdenek Dvorak
2003-12-07 17:36 ` Diego Novillo
2003-12-07 18:09 ` Zdenek Dvorak
2003-12-11 19:39 ` law [this message]
2003-12-07 22:20 ` Steven Bosscher
2003-12-09 14:30 ` Andrew MacLeod
2003-12-09 20:40 ` Zdenek Dvorak
2003-12-11 19:41 ` law
2003-12-11 19:38 ` law
2003-12-11 19:52 ` Zdenek Dvorak
2003-12-11 22:36 ` Zdenek Dvorak
2003-12-11 23:34 ` Andrew MacLeod
2003-12-15 19:10 ` Andrew MacLeod
2003-12-15 19:19 ` Zdenek Dvorak
2003-12-15 20:55 ` Andrew MacLeod
2003-12-15 21:06 ` Zdenek Dvorak
2003-12-15 21:39 ` Andrew MacLeod
2003-12-15 21:49 ` Zdenek Dvorak
2003-12-15 22:04 ` Andrew MacLeod
2003-12-15 22:39 ` law
2003-12-17 4:56 ` law
2003-12-16 23:32 ` Andrew MacLeod
2003-12-17 0:09 ` Zdenek Dvorak
2003-12-17 0:21 ` Andrew MacLeod
2003-12-17 3:28 ` law
2003-12-15 19:28 ` Diego Novillo
2003-12-11 22:31 Chris Lattner
2003-12-12 3:14 ` law
2003-12-12 3:58 ` Chris Lattner
2003-12-12 19:25 ` Andrew MacLeod
2003-12-12 19:42 ` Zdenek Dvorak
2003-12-12 19:45 ` Andrew MacLeod
2003-12-12 19:54 ` Chris Lattner
2003-12-12 19:55 ` Andrew MacLeod
2003-12-12 21:26 ` Diego Novillo
2003-12-12 19:57 ` Chris Lattner
2003-12-13 16:02 ` Andrew MacLeod
2003-12-14 3:39 ` Chris Lattner
2003-12-15 23:41 ` law
2003-12-16 6:02 ` Andrew MacLeod
2003-12-15 20:47 Chris Lattner
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