[Nouveau] [Bug 90887] PhiMovesPass in register allocator broken

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90887

--- Comment #3 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Gah! The inbound edge ordering having to be the same as in phi nodes has bit me
before as well. I wonder if it wouldn't be simpler to just fix that, i.e. make
phi nodes attach a bb reference to each argument.

In any case, I'll be able to take a closer look in a week or so. Great
detective work btw.

FTR, nva5 should be able to allow manual reclocking on kernel 3.19+ (if you add
nouveau.pstate=1), which should help decrease some of the perf difference wrt
blob.

Also, bug 90347 is completely different... that findFirstUse stuff is pretty
dodgy in the first place, and it happens post-RA. (And only on kepler+)

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