linux-kernel - Re: gcc 4.5.1 / as 2.20.51.0.11 miscompiling drivers/char/i8k.c ?

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Date:	Mon, 15 Nov 2010 19:17:31 +0100
From:	Jim Bos <jim876@...all.nl>
To:	Jakub Jelinek <jakub@...hat.com>
CC:	Andi Kleen <andi@...stfloor.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	James Cloos <cloos@...loos.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andreas Schwab <schwab@...hat.com>,
	Michael Matz <matz@...e.de>,
	Dave Korn <dave.korn.cygwin@...il.com>,
	Richard Guenther <richard.guenther@...il.com>, gcc@....gnu.org
Subject: Re: gcc 4.5.1 / as 2.20.51.0.11 miscompiling drivers/char/i8k.c ?

On 11/15/2010 06:44 PM, Jakub Jelinek wrote:
> On Mon, Nov 15, 2010 at 06:36:06PM +0100, Jim Bos wrote:
>> On 11/15/2010 12:37 PM, Andi Kleen wrote:
>> See attached, note this is the vanilla 2.6.36 i8k.c (without any patch).
>> And to be 100% sure, if I build this (make drivers/char/i8k.ko) it won't
>> work.
>>
>> [ The i8k.i is rather big, even gzipped 80k, not sure if it'll bounce ]
> 
> Please also say which exact gcc you are using.
> 
> Note, I've compiled it with current 4.5 branch and made the function
> always_inline and still didn't see any issues in the *.optimized dump,
> regs.eax after the inline asm has always been compared to the constant
> that has been stored into regs.eax before the inline asm.
> 
> 	Jakub
> --
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 # gcc -v
Reading specs from /usr/lib/gcc/i486-slackware-linux/4.5.1/specs
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/i486-slackware-linux/4.5.1/lto-wrapper
Target: i486-slackware-linux
Configured with: ../gcc-4.5.1/configure --prefix=/usr --libdir=/usr/lib
--mandir=/usr/man --infodir=/usr/info --enable-shared --enable-bootstrap
--enable-languages=ada,c,c++,fortran,java,objc --enable-threads=posix
--enable-checking=release --with-system-zlib
--with-python-dir=/lib/python2.6/site-packages
--disable-libunwind-exceptions --enable-__cxa_atexit --enable-libssp
--with-gnu-ld --verbose --with-arch=i486 --target=i486-slackware-linux
--build=i486-slackware-linux --host=i486-slackware-linux
Thread model: posix
gcc version 4.5.1 (GCC)

I'm re-reading this thread where I found the asm-> asm volatine suggestion:
  https://bbs.archlinux.org/viewtopic.php?pid=752099#p752099
but nobody there reported their gcc version (but apparently first
people started complaining May 1st).

_
Jim
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