<courmisch>
is there an effective way to extend vector elements from 64 to 128 bits? gather is obviously sluggish (I don't care about what's in the top halves)
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<dzaima[m]>
I haven't come up with anything other than gather
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<dh`>
anyone know where in buildroot you configure the -march=... details? I am trying to figure out if it's building with the C extension or not and if so whether it's feasible to turn that off as a workaround for some issues I have
<dh`>
but I can't find it
<dh`>
(I mean not in the kernel)
<dh`>
or is this going to be different in every damn package because that's how linux goes?
<ja_02>
in target options there is an option for BR2_RISCV_ISA_RVC
<ja_02>
you can also do BR2_riscv_custom
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<ja_02>
that does bode a new question tho how do you specify a specific -march= which i dont know
<JohnHenry>
AFAIK the idea is that we should put a big string that contains all the extensions in there, and then mtune= should have the the bits that talk about microarchitectural tuning stuff?
<sorear>
that's how march and mtune work in gcc but I believe the question was about buildroot
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<dh`>
I was asking about buildroot config, yeah
<dh`>
but my question is answered, don't need to know how to turn on compiler support for this month's trendy extensions
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<JohnHenry>
oh whoops missed that
<JohnHenry>
sorry for unhelpful answer :)
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<dh`>
no worries
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