[Nouveau] [Bug 90348] Spilling failure of b96 merged value

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90348

--- Comment #2 from Ilia Mirkin <imirkin at alum.mit.edu> ---
This is a preliminary patch to resolve the issue that I wrote a while back:

https://github.com/imirkin/mesa/commit/25c74a866b5b555699520552caeccb1e8426d86b.patch

Note that it needs a counterpart unspill variant too (although that's not hit
by this shader). And ideally it'd be smart enough to go for a 64 + 32 store
rather than 3x 32, but that's probably too much -- split then re-merge. (Or can
split take unevenly sized defs? That seems like asking for trouble.)

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