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Subject: Re: short C code that uses AVX and fails under Cygwin
To: cygwin AT cygwin DOT com
References: <56980313 DOT 5030205 AT mit DOT edu> <CAFo71_59ybiGsd3Vc_ubs8o_cpO32QqpWAidfiM9hmQ4PpAozQ AT mail DOT gmail DOT com>
From: Ilya Razenshteyn <ilyaraz AT mit DOT edu>
Message-ID: <56980B4F.9090509@mit.edu>
Date: Thu, 14 Jan 2016 23:55:43 +0300
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Looks like this is indeed what happens! Thanks a lot!


Ilya

On 1/14/2016 11:49 PM, Ismail Donmez wrote:
> Hi,
>
> On Thu, Jan 14, 2016 at 10:20 PM, Ilya Razenshteyn <ilyaraz AT mit DOT edu> wrote:
>> Hi all,
>>
>> the below C code fails under Cygwin. More specifically, the environment is:
>> Windows 8.1, Cygwin 2.3.1, GCC 4.9.3, CPU 'Intel(R) Core(TM) i7-4510U CPU @
>> 2.00GHz', compilation options are '-O0 -mavx'. Is it indeed a bug in Cygwin
>> or I don't understand something?
>>
>> Cheers,
>> Ilya
>>
>> #include "immintrin.h"
>>
>> __m256 routine(void) {
>>    __m256 aux;
>>    return aux;
>> }
>>
>> int main(void) {
>>    void *buf = malloc(1);
>>    __m256 res = routine();
>>    return 0;
>> }
>
> I believe this is due to
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54412 ,
> https://stackoverflow.com/questions/5983389/how-to-align-stack-at-32-byte-boundary-in-gcc
> has an ugly workaround which might work for you.
>
> Regards,
> ismail
>
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