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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #18 from Ilia Mirkin <imirkin at alum.mit.edu> ---
(In reply to Ilia Mirkin from comment #17)
> Created attachment 116761 [details] [review]
> another attempt
> 
> OK, I like this a bit better since it doesn't use any weird maps, and incurs
> minimal costs in the common case. It unfortunately encodes the graph's
> insertion strategy, but... meh.

Ugh, actually this patch won't work. It needs to be

         phi->setSrc(j, tmp);

but then I lose the "old" phi source. So perhaps the map approach is ~required
:(

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