From: Richard Sandiford <rsandifo@redhat.com>
To: Alexandre Oliva <aoliva@redhat.com>
Cc: Kazu Hirata <kazu@cs.umass.edu>, gcc-patches@gcc.gnu.org
Subject: Re: add h8sx support to h8300
Date: Thu, 08 Jul 2004 06:08:00 -0000 [thread overview]
Message-ID: <87fz83f456.fsf@redhat.com> (raw)
In-Reply-To: <oru0wjeays.fsf@free.redhat.lsd.ic.unicamp.br> (Alexandre Oliva's message of "07 Jul 2004 18:58:19 -0300")
Alexandre Oliva <aoliva@redhat.com> writes:
> + - we would like 'D' to be be NO_REGS when the frame pointer isn't
> + live, but we the frame pointer may turn out to be needed after
> + we start reload, and then we may have already decided we don't
> + have a choice, so we can't do that. Forcing the register
> + allocator to use er6 if possible might produce better code for
> + small functions: it's more efficient to save and restore er6 in
> + the prologue & epilogue than to do it in a define_split.
> + Hopefully disparaging 'D' will have a similar effect, without
> + forcing a reload failure if the frame pointer is found to be
> + needed too late. */
Not sure I understand this. Do you have a testcase?
Richard
next prev parent reply other threads:[~2004-07-08 5:40 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-06-21 14:24 Alexandre Oliva
2004-06-21 17:12 ` Kazu Hirata
2004-06-23 2:23 ` Alexandre Oliva
2004-07-07 22:11 ` Alexandre Oliva
2004-07-08 6:08 ` Richard Sandiford [this message]
2004-07-08 7:41 ` Alexandre Oliva
2004-07-08 9:39 ` Richard Sandiford
2004-07-08 18:16 ` Alexandre Oliva
2004-07-08 18:16 ` Richard Sandiford
2004-07-08 20:23 ` Alexandre Oliva
2004-07-12 20:14 ` Richard Sandiford
2004-07-14 12:49 ` Alexandre Oliva
2004-07-14 17:16 ` Richard Sandiford
2004-07-15 4:11 ` Alexandre Oliva
2004-07-15 5:22 ` Richard Sandiford
2004-07-15 16:25 ` Alexandre Oliva
2004-07-15 17:14 ` Richard Sandiford
2004-07-15 17:25 ` Richard Sandiford
2004-07-15 22:23 ` Alexandre Oliva
2004-07-08 21:20 ` Alexandre Oliva
2004-07-06 20:56 ` Alexandre Oliva
2004-07-07 2:37 ` Richard Henderson
2004-07-07 7:06 ` Alexandre Oliva
2004-07-07 9:06 ` Richard Henderson
2004-07-08 0:14 ` Alexandre Oliva
2004-07-08 1:22 ` Richard Henderson
2004-07-08 1:26 ` Alexandre Oliva
2004-07-08 2:01 ` Richard Henderson
2004-07-08 4:39 ` Alexandre Oliva
2004-07-08 18:59 ` Alexandre Oliva
2004-07-07 9:13 ` Joseph S. Myers
2004-07-07 19:44 ` Alexandre Oliva
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