From: kenner@vlsi1.ultra.nyu.edu (Richard Kenner)
To: matz@suse.de
Cc: gcc@gcc.gnu.org
Subject: Re: What to remove after tree-ssa is merged?
Date: Wed, 04 Feb 2004 15:19:00 -0000 [thread overview]
Message-ID: <10402041522.AA00910@vlsi1.ultra.nyu.edu> (raw)
I've read the docu and think know when you need it (although I'm not sure
about the specifics of how they are evaluated to RTL), but I don't see a
reason why this can't be in the front-end, and lowered to trees which do
not contain PLACEHOLDER_EXPR or WITH_RECORD_EXPR. After all the functions
in expr.c even manage to lower such trees to RTL, so there must be some
way to lower them to GIMPLE which are higher level, isn't there?
There are two separate issues:
(1) The usage of PLACEHOLDER_EXPR in statements.
(2) The usage in types.
For (1), as I said, it is probably possible to fold the PLACEHOLDER_EXPR
into the appropriate object at some point precisely because, as you say,
this can be done when it's lowered to RTL. So this usage indeed isn't
a problem.
But I don't see how to eliminate the usage in (2). So the node can't
be eliminated.
next reply other threads:[~2004-02-04 15:19 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-02-04 15:19 Richard Kenner [this message]
2004-02-04 15:31 ` Michael Matz
-- strict thread matches above, loose matches on Subject: below --
2004-02-04 21:55 Richard Kenner
2004-02-04 21:25 Richard Kenner
2004-02-04 21:51 ` Paul Brook
2004-02-04 21:09 Richard Kenner
2004-02-05 5:32 ` Richard Henderson
2004-02-05 5:50 ` Geert Bosch
2004-02-04 20:55 Richard Kenner
2004-02-04 21:21 ` Paul Brook
2004-02-04 18:43 Richard Kenner
2004-02-04 19:49 ` Paul Brook
2004-02-04 20:15 ` Richard Henderson
2004-02-04 17:54 Richard Kenner
2004-02-04 18:39 ` Paul Brook
2004-02-04 16:14 Richard Kenner
2004-02-04 16:39 ` Michael Matz
2004-02-04 15:49 Richard Kenner
2004-02-04 16:10 ` Michael Matz
2004-02-04 17:25 ` Robert Dewar
2004-02-04 15:21 Richard Kenner
2004-02-04 15:16 S. Bosscher
2004-02-04 14:48 Richard Kenner
2004-02-04 14:36 Richard Kenner
2004-02-04 14:44 ` Andrew Pinski
2004-02-04 15:15 ` Michael Matz
2004-02-04 13:52 Richard Kenner
2004-02-04 13:29 S. Bosscher
2004-02-04 13:49 ` Paul Brook
2004-02-04 14:04 ` Michael Matz
2004-02-04 14:19 ` Robert Dewar
2004-02-04 14:31 ` Andrew Pinski
2004-02-04 14:53 ` Robert Dewar
2004-02-04 12:30 Richard Kenner
2004-02-03 16:20 "Documentation by paper" Richard Kenner
2004-02-03 16:54 ` Jan Hubicka
2004-02-03 16:58 ` What to remove after tree-ssa is merged? Paolo Bonzini
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