From: Andreas Schwab <schwab@suse.de>
To: "Gunnar Von Boehn" <gunnar@genesi-usa.com>
Cc: gcc-patches@gcc.gnu.org
Subject: Re: Fix for GCC Bugzilla Bug 36133
Date: Tue, 17 Jun 2008 12:33:00 -0000 [thread overview]
Message-ID: <je7iconupp.fsf@sykes.suse.de> (raw)
In-Reply-To: <b989d750806060633v27924455t3d0ec17ae336865a@mail.gmail.com> (Gunnar Von Boehn's message of "Fri, 6 Jun 2008 15:33:13 +0200")
"Gunnar Von Boehn" <gunnar@genesi-usa.com> writes:
> Please apply the patch and recompile.
> GCC is now aware that the LSR instruction does set the CC already and
> will not create the unneeded TST.
That does not look correct, see the comment in notice_update_cc:
case ASHIFT: case ASHIFTRT: case LSHIFTRT:
case ROTATE: case ROTATERT:
/* These instructions always clear the overflow bit, and set
the carry to the bit shifted out. */
/* ??? We don't currently have a way to signal carry not valid,
nor do we check for it in the branch insns. */
CC_STATUS_INIT;
break;
Andreas.
--
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
PGP key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
next prev parent reply other threads:[~2008-06-17 11:54 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-06 13:33 Gunnar Von Boehn
2008-06-17 12:33 ` Andreas Schwab [this message]
2008-06-17 17:31 ` Gunnar Von Boehn
2008-06-17 19:21 ` Andreas Schwab
2008-06-19 12:50 ` Gunnar Von Boehn
2008-06-24 16:15 ` Gunnar Von Boehn
2008-06-25 19:05 ` Andreas Schwab
2008-06-27 13:02 ` Gunther Nikl
2008-06-27 13:48 ` Andreas Schwab
[not found] ` <b989d750806300851s6ff51ad3j4d8b3e6da6fe2599@mail.gmail.com>
2008-07-01 9:03 ` Fwd: " Gunnar Von Boehn
2008-06-27 13:57 ` Andreas Krebbel
2008-06-27 14:12 ` Andreas Schwab
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