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On 8/30/19 11:29 PM, Michał Górny wrote: |
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> On Sat, 2019-08-31 at 00:19 -0700, Georgy Yakovlev wrote: |
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>> On 8/30/19 11:11 PM, Michał Górny wrote: |
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>>> On Sat, 2019-08-31 at 00:03 -0700, Georgy Yakovlev wrote: |
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>> <snip> |
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>>>> +altivec - Use the AltiVec instruction set |
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>>>> +vsx - Use the Vector Scalar Extension instruction set (POWER7 and later) |
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>>>> +vsx3 - Use the Vector Scalar Extension v.3 instruction set (POWER9 and later) |
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>>> |
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>>> Do all those flags have real use cases in ::gentoo? I'd really prefer |
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>>> not having more 'unused flag' warnings ;-). |
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>>> |
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>> |
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>> yeah, I have mentioned possible users above and there are plenty I |
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>> haven't identified yet. patches to ebuilds will follow, I promise =) |
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>> |
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>> for example x264 if built with proper flags gives a noticeable boost, |
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>> (at least 2x at encoding), totally worth it. |
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>> |
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>> ppc will not have a lot of flags like on arm or x86, maybe a couple |
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>> more, but that's it for now. |
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>> |
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> |
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> Just to be clear: we're not talking about -m compiler flags, are we? |
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> 'cause those should be handled via CFLAGS. |
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> |
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of course not just compiler flags, that's clear. |
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for example libpng has --enable-powerpc-vsx ./configure flag, and build |
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system will do it's black magic with intrinsics if it's passed. |
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