[Bug 93681] GLSL compilation can be very slow

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93681

--- Comment #3 from Matt Turner <mattst88 at gmail.com> ---
Created attachment 120995
  --> https://bugs.freedesktop.org/attachment.cgi?id=120995&action=edit
new.shader_test

(In reply to Matt Turner from comment #2)
> I read the shader a bit more and have decided that all indirect accesses
> could be statically determined to occur in limited ranges of the temps[]
> array.

With that knowledge in hand, I've modified slow.shader_test to limit indirect
accesses to small arrays -- by making

        vec4 temps_9_14[6];
        vec4 temps_15_20[6];
        vec4 temps_21_25[5];
        vec4 temps_26_30[5];

and modifying the accesses accordingly. That shader (attached with this
comment) compiles in the blink of an eye and is

712 instructions. 8 loops. 1146286 cycles. 0:0 spills:fills. 115 basic blocks.

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