From: David Edelsohn <dje@watson.ibm.com>
To: Andrew Haley <aph@redhat.com>
Cc: Gabriel Paubert <paubert@iram.es>,
Sergei Poselenov <sposelenov@emcraft.com>,
gcc@gcc.gnu.org, "'rt'" <rt@emcraft.com>
Subject: Re: powercp-linux cross GCC 4.2 vs GCC 4.0.0: -Os code size regression? [Emcraft #11717]
Date: Sat, 19 Jan 2008 16:35:00 -0000 [thread overview]
Message-ID: <200801191624.m0JGOvlM024140@makai.watson.ibm.com> (raw)
In-Reply-To: <4791F924.6020603@redhat.com>
>>>>> Andrew Haley writes:
Andrew> I suspect that the real reason for the change in save/restore is because
Andrew> not using lmw/stmw is faster. That's just a guess though. gcc could probably
Andrew> be fixed to use ldmw/stmw if -Os is used.
Andrew> Anyway, now we've found something specific this is for the ppc maintainer to comment.
GCC does use load/store multiple and load/store string
instructions if -Os is used, but not when the sequence is broken up by a
fixed register.
David
next prev parent reply other threads:[~2008-01-19 16:26 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-16 11:24 powercp-linux cross GCC 4.2 vs GCC 4.0.0: -Os code size regression? Sergei Poselenov
2008-01-16 12:15 ` Duncan Sands
2008-01-16 12:19 ` Sergei Poselenov
2008-01-16 12:35 ` Duncan Sands
2008-01-16 13:20 ` Andrew Haley
2008-01-16 13:17 ` Andrew Haley
2008-01-16 15:59 ` Sergei Poselenov
2008-01-16 17:10 ` Andrew Haley
2008-01-16 17:14 ` Sergei Poselenov
2008-01-16 19:36 ` Andrew Haley
2008-01-17 14:52 ` powercp-linux cross GCC 4.2 vs GCC 4.0.0: -Os code size regression? [Emcraft #11717] Sergei Poselenov
2008-01-17 15:11 ` Richard Guenther
2008-01-17 18:27 ` Gabriel Paubert
2008-01-19 16:26 ` Andrew Haley
2008-01-19 16:35 ` David Edelsohn [this message]
2008-01-19 16:51 ` Andrew Haley
2008-01-19 19:10 ` David Edelsohn
2008-01-21 17:25 ` powercp-linux cross GCC 4.2 vs GCC 4.0.0: -Os code size regression? (filed bug 34903)[Emcraft #11717] Sergei Poselenov
2008-01-17 12:14 ` powercp-linux cross GCC 4.2 vs GCC 4.0.0: -Os code size regression? Gabriel Paubert
2008-01-17 12:47 ` Sergei Poselenov
2008-01-17 13:10 ` Gabriel Paubert
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