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From: "henning dot m at insightbb dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/33970] Missed optimization using unsigned char loop variable
Date: Tue, 06 Nov 2007 12:37:00 -0000 [thread overview]
Message-ID: <20071106123732.499.qmail@sourceware.org> (raw)
In-Reply-To: <bug-33970-15294@http.gcc.gnu.org/bugzilla/>
------- Comment #9 from henning dot m at insightbb dot com 2007-11-06 12:37 -------
(In reply to comment #8)
> (In reply to comment #7)
> > With Mike's description in comment #6, confirmed on 4.1.2 and 4.2.2. AVR GCC
> > 4.2.2 is worse than 4.1.2, in that even if sub2 is called with (x+1), the
> > variable is still 16 bits.
> >
>
> There is something more going on, this is the assembler output when sub2 is not
> in the same file, and calling sub2(x), i.e not x+1:
> ===================================================================
I think you will also find that if x is changed from ststic to auto the same
problem appears.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33970
next prev parent reply other threads:[~2007-11-06 12:37 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-01 13:44 [Bug c/33970] New: " henning dot m at insightbb dot com
2007-11-01 14:10 ` [Bug c/33970] " rguenth at gcc dot gnu dot org
2007-11-01 17:09 ` [Bug middle-end/33970] " pinskia at gcc dot gnu dot org
2007-11-01 17:28 ` eweddington at cso dot atmel dot com
2007-11-01 17:45 ` eweddington at cso dot atmel dot com
2007-11-01 17:47 ` eweddington at cso dot atmel dot com
2007-11-01 21:26 ` henning dot m at insightbb dot com
2007-11-04 23:28 ` eweddington at cso dot atmel dot com
2007-11-04 23:28 ` eweddington at cso dot atmel dot com
2007-11-05 22:48 ` wvangulik at xs4all dot nl
2007-11-06 12:37 ` henning dot m at insightbb dot com [this message]
2007-11-06 19:35 ` wvangulik at xs4all dot nl
2007-11-06 21:01 ` wvangulik at xs4all dot nl
2010-09-13 12:09 ` abnikant dot singh at atmel dot com
[not found] <bug-33970-4@http.gcc.gnu.org/bugzilla/>
2011-07-20 17:48 ` gjl at gcc dot gnu.org
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