linux-kernel - Re: FYI GCC 4.6.x miscompiles the kernel

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Message-ID: <m31uwo6krg.fsf_-_@intrepid.localdomain>
Date:	Sun, 14 Aug 2011 18:05:55 +0200
From:	Krzysztof Halasa <khc@...waw.pl>
To:	Marek Vasut <marek.vasut@...il.com>
Cc:	linux-arm-kernel@...ts.infradead.org,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: FYI GCC 4.6.x miscompiles the kernel

Correction: this bug isn't ARM-specific.

Marek Vasut <marek.vasut@...il.com> writes:

>> Current gcc-4.6.x SVN, ARMEB EABI.
>
> Shouldn't this go to GCC ML too ?

Nope, I put it in bugzilla.

>> unsigned var[2];
>>
>> void test(int arg)
>> {
>>         unsigned v = *(volatile unsigned *)(&var[arg]);
>>         *(volatile unsigned *)(&var[arg]) = v;
>> }
>>
>> Disassembly of section .text:
>>
>> 00000000 <test>:
>>    0:   e12fff1e        bx      lr

On x86-64:
0000000000000000 <test>:
   0:   f3 c3                   repz retq
-- 
Krzysztof Halasa
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