[Bug 90887] PhiMovesPass in register allocator broken

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org]

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

--- Comment #32 from jr <j-r-BGeptl67XyCzQB+pC5nmwQ@public.gmane.org> ---
(In reply to Ilia Mirkin from comment #31)
> Really if I could understand wtf the needNewElseBlock logic was trying to
> do, and could construct a test shader to hit this in *regular* scenarios,
> not just the lowered output of TXL, that would make me a lot more
> comfortable with any approach that we pick.

Looking at the TGSI->IR translation I'd guess that needNewElseBlock is trying
to detect the edge from the 'bare' unconditional jump in an if without else,
seemingly because adding the new moves is not allowed (though I'm not sure
why). At least it seems to be the only construct creating a graph satisfying
the condition, AFAICT.

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