[Mesa-dev] [Bug 27512] Illegal instruction _mesa_x86_64_transform_points4_general

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Wed Feb 3 21:10:04 UTC 2016


https://bugs.freedesktop.org/show_bug.cgi?id=27512

--- Comment #19 from Timothy Arceri <t_arceri at yahoo.com.au> ---
(In reply to Roland Scheidegger from comment #18)
> 
> That doesn't make sense to me. The offset is just part of the memory
> operand. Unless the assembler encodes it wrong I can't see why that wouldn't
> work (which I would think to be unlikely, but the locality hints are also
> encoded into the mod r/m byte - what's the encoding of the instruction?)
> I suppose a solution would just be to ditch prefetch - as was pointed out
> it's not really far ahead enough in any case, even k8 and p4 had primitive
> hw prefetchers which should make such a simple software prefetch completely
> unnecessary.

I shouldn't play with asm passed my bedtime ... I was having trouble with the
patch applying so recreated it myself. Seems the problem was I missed one
instruction. All works well once fixed so I've sent that patch to the mailing
list.

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