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I have quite new CPU (i7-4770K) and old version of Ubuntu (12.04 LTS 64-bit).
It was not possible to compile 3.7RC7 with default settings, the compilation
stopped with unknown assembly instructions when old gcc didn't recognize Haswell
architecture's native instructions.
I query-replaced march=native with march=corei7 from configure file and after
that all went normally.
I can't say if the speed suffered, but now it shows all 8 (virtual) cores in
100% load when rendering and it is much faster than my older i5-750 rig.
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From: clipka
Subject: Re: How to compile 3.7RC7 with Haswell and older gcc version, my solution
Date: 25 Aug 2013 07:55:36
Message: <5219f0b8@news.povray.org>
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> I have quite new CPU (i7-4770K) and old version of Ubuntu (12.04 LTS 64-bit).
>
> It was not possible to compile 3.7RC7 with default settings, the compilation
> stopped with unknown assembly instructions when old gcc didn't recognize Haswell
> architecture's native instructions.
>
> I query-replaced march=native with march=corei7 from configure file and after
> that all went normally.
>
> I can't say if the speed suffered, but now it shows all 8 (virtual) cores in
> 100% load when rendering and it is much faster than my older i5-750 rig.
Thanks for sharing.
Just for the sake of completeness, your gcc version might also be of
interest to readers.
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clipka <ano### [at] anonymous org> wrote:
> Just for the sake of completeness, your gcc version might also be of
> interest to readers.
gcc 4.6.3, from 12.04 LTS repos.
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> I have quite new CPU (i7-4770K) and old version of Ubuntu (12.04 LTS 64-bit).
>
> It was not possible to compile 3.7RC7 with default settings, the compilation
> stopped with unknown assembly instructions when old gcc didn't recognize Haswell
> architecture's native instructions.
>
> I query-replaced march=native with march=corei7 from configure file and after
> that all went normally.
>
> I can't say if the speed suffered, but now it shows all 8 (virtual) cores in
> 100% load when rendering and it is much faster than my older i5-750 rig.
Haswell implements AVX2, but I doubt gcc can extract enough parallelism from the
povray code to utilize those instructions effectively.
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