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From:	Tim Prince <timothyprince AT sbcglobal DOT net>
Reply-To:	tprince AT computer DOT org
To:	Kenn Heinrich <heinrich AT idirect DOT com>, cygwin AT cygwin DOT com
Subject:	Re: SSE2 priviliged instruction exception
Date:	Fri, 2 May 2003 21:20:19 -0700
References:	<3EB2F202 DOT 8080201 AT idirect DOT com>
In-Reply-To:	<3EB2F202.8080201@idirect.com>
MIME-Version:	1.0

On Friday 02 May 2003 15:32, Kenn Heinrich wrote:
> Hi,
>
> I couldn't find an answer on Google, so here goes:
>
> I get a privileged instruction exception on a P4 win 2K. The same
> code (and more extensive use of SSE2) executes properly on
> a pentium 4 redhat 8 box. gcc is 3.2
>
> #include <xmmintrin.h>
> #include <stdio.h>
> main()
> {
>   __m128 k;
>   k = _mm_setzero_ps();
>   printf("done\n");
> }
>
> and compile it with
>
> gcc -march=pentium4 -msse2
rtfm, even before Googling:  'info gcc' preferred-stack.  Unfortunately, 
'info malloc' lies on this topic, but that's not within the sphere of 
influence of gcc maintainers.  Nor is this corner of gcc under the control of 
cygwin maintainers.
On linux, you may have a 50/50 chance of being lucky with alignment; on 
Windows, maybe 25/75.  You have not taken any measure to get the stack 
aligned before allocating memory. You could malloc() and adjust for an 
aligned pointer, or push the allocation down into a function.
-- 
Tim Prince

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