[Bug 84557] [HSW] Investigate why compacted control flow hangs the GPU

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84557

--- Comment #11 from Antia Puentes <apuentes at igalia.com> ---
While we do not investigate this further and to be safe, I sent a patch to
Mesa's mailing list to use W when emitting the JIP for instructions that were
previously using UD:

http://lists.freedesktop.org/archives/mesa-dev/2015-March/079328.html

As far as I understand, we do not get any benefit from using UD and if we go
against the HW specs, nothing guarantees us to not have undesired effects even
when they have not been observed until now.

However, the patch does not change the type of JIP in instructions that were
already emitting it with D, as I understand from the comments in this bug that
we do get a benefit from that, that is to have compacted instructions.

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