From: "Joseph S. Myers" <joseph@codesourcery.com>
To: Ian Lance Taylor <iant@google.com>
Cc: Nathan Froyd <froydnj@codesourcery.com>,
roy rosen <roy.1rosen@gmail.com>,
gcc@gcc.gnu.org
Subject: Re: lower subreg optimization
Date: Tue, 06 Apr 2010 19:23:00 -0000 [thread overview]
Message-ID: <Pine.LNX.4.64.1004061919220.27521@digraph.polyomino.org.uk> (raw)
In-Reply-To: <mcr6344qum2.fsf@dhcp-172-17-9-151.mtv.corp.google.com>
On Tue, 6 Apr 2010, Ian Lance Taylor wrote:
> This code is sort of weird, though; why the conversion from DImode to
> DFmode?
See <http://gcc.gnu.org/ml/gcc-patches/2006-12/msg00245.html> for
discussion of the e500 subregs and their semantics. I made them work
reliably (for 4.3 and later, 4.4 and later when decimal floating-point
modes are involved) - but not necessarily efficiently in all cases.
--
Joseph S. Myers
joseph@codesourcery.com
prev parent reply other threads:[~2010-04-06 19:23 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-06 9:24 roy rosen
2010-04-06 16:37 ` Jim Wilson
2010-04-08 6:16 ` roy rosen
2010-04-09 16:52 ` Jim Wilson
2010-04-06 16:58 ` Ian Lance Taylor
2010-04-06 17:13 ` Nathan Froyd
2010-04-06 17:27 ` Steven Bosscher
2010-04-06 18:55 ` Ian Lance Taylor
2010-04-06 19:05 ` Nathan Froyd
2010-04-06 19:23 ` Joseph S. Myers [this message]
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