Hi Steve,
On Tue, Jun 14, 2011 at 10:47 PM, S. Erisman <seris...@serisman.com> wrote:
> Marc,
>
>
> On 6/14/2011 7:01 PM, Marc-André Moreau wrote:
>
>> Hi Steve,
>>
>> I noticed the addition of cpuid.h, which is not found on Mac OS X. Is
>> there a more portable alternative for detecting SSE support level? Can't the
>> cpuinfo instruction be used for this?
>>
>
> That's weird. I was under the assumption that cpuid.h was provided by
> default by GCC. Are you using a different compiler?
>
Nope, it is using GCC on Mac OS X, it doesn't find the header file
>
> Do you have any additional information about the cpuinfo instruction you
> are talking about? I Googled it and didn't find much promising. Or...
> maybe you are talking about parsing /proc/cpuinfo. If so, there are a lot
> of comments out there about that being a bad idea.
>
Sorry, my bad, the real instruction name is cpuid, not cpuinfo :(
http://softpixel.com/~cwright/programming/simd/cpuid.php
>
> One possibility is to roll our own cpuid instruction based on information
> found here and put it in our rfx_sse.h file:
> http://softpixel.com/~cwright/programming/simd/cpuid.php
>
> Yes, this is what I was thinking
> On the Windows side, we can probably just use __cpuid found in <intrin.h>:
> http://msdn.microsoft.com/en-us/library/hskdteyh.aspx
> Do you know if Mac OS X has this file? GCC didn't seem to find it on my
> Ubuntu machines.
>
I don't think so, I think those are different intrinsics. Maybe wrappers
exist though.
>
> Thanks,
> Steve
>
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