[Bug 98409] 4.5% perf drop in CSDof with "nir: Optimize integer division and modulus with 1"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98409

--- Comment #6 from Eero Tamminen <eero.t.tamminen at intel.com> ---
(In reply to Jordan Justen from comment #5)
> When reverting:
> 
> 4d35683 nir: Optimize integer division and modulus with 1
> 
> Did you also revert these?

No.


> 64c3d73 i965/cs: Don't use a thread channel ID for small local sizes
> 1fa000a i965/cs: Use udiv/umod for local IDs
> 
> It would be good to know if taking the current master, and
> reverting these 3 patches regains the 4-5%.

Tried that now.

If one builds commit 4d35683, reverting just that commit fixes the drop.  With
HEAD, that's not enough, but reverting all 3 patches does fix the drop there
too.

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