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To:	cygwin AT cygwin DOT com
From:	Ilya Razenshteyn <ilyaraz AT mit DOT edu>
Subject:	short C code that uses AVX and fails under Cygwin
Message-ID:	<56980313.5030205@mit.edu>
Date:	Thu, 14 Jan 2016 23:20:35 +0300
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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;
}



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