[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 #5 from Jordan Justen <jljusten at gmail.com> ---
(In reply to Eero Tamminen from comment #4)
> Confirming Matt's observation.
> 
> Reverting the indicated change from Mesa HEAD, doesn't affect the
> performance, although going back to version before this commit (or commits
> before it), shows 4-5% better perf than the version built from the commit. 
> I.e. additional changes after the indicated commit also have effect on CSDof
> test.

When reverting:

4d35683 nir: Optimize integer division and modulus with 1

Did you also revert these?

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%.

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