On 8/30/19 11:29 PM, Michał Górny wrote: > On Sat, 2019-08-31 at 00:19 -0700, Georgy Yakovlev wrote: >> 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. >> > > Just to be clear: we're not talking about -m compiler flags, are we? > 'cause those should be handled via CFLAGS. >
of course not just compiler flags, that's clear. for example libpng has --enable-powerpc-vsx ./configure flag, and build system will do it's black magic with intrinsics if it's passed.
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