Re: [gentoo-dev] [PATCH 1/2] profiles/desc: descriptions for CPU_FLAGS_PPC use_expand

[Georgy Yakovlev <gyakovlev@gentoo.org>]

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On 8/30/19 11:11 PM, Michał Górny wrote:
> On Sat, 2019-08-31 at 00:03 -0700, Georgy Yakovlev wrote:
<snip>
>> +altivec - Use the AltiVec instruction set
>> +vsx - Use the Vector Scalar Extension instruction set (POWER7 and later)
>> +vsx3 - Use the Vector Scalar Extension v.3 instruction set (POWER9 and later)
> 
> Do all those flags have real use cases in ::gentoo?  I'd really prefer
> not having more 'unused flag' warnings ;-).
> 

yeah, I have mentioned possible users above and there are plenty I
haven't identified yet. patches to ebuilds will follow, I promise =)

for example x264 if built with proper flags gives a noticeable boost,
(at least 2x at encoding), totally worth it.

ppc will not have a lot of flags like on arm or x86, maybe a couple
more, but that's it for now.


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