[Bug 97035] compilation of WebGL demo iamnop.com/particles shader slowed 5x, run-time perf dropped to 1/10th

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97035

--- Comment #13 from Eero Tamminen <eero.t.tamminen at intel.com> ---
(In reply to Eero Tamminen from comment #12)
> Tested latest Mesa.  On my SKL GT2 the slow shader still takes ~20s to
> compile and produces following Mesa statistics:
> SIMD8 shader: 7985 instructions. 0 loops. 57210 cycles. 359:993
> spills:fills. Promoted 19 constants. Compacted 127760 to 86032 bytes (33%)

Latest Mesa (i.e. 5 months later) uses 17-18ms to compile on that machine, and
gets following statistics:
SIMD8 shader: 8127 instructions. 0 loops. 57436 cycles. 369:1019 spills:fills.
Promoted 18 constants. Compacted 130032 to 87472 bytes (33%)

I.e. there's been a minor improvement in compile time, but regression from
v11.2 is still valid and spilling & instruction counts have gotten slightly
worse. "perf" output looks same as earlier.

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