[Bug 91857] Mesa 10.6.3 linker is slow

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91857

--- Comment #29 from Ilia Mirkin <imirkin at alum.mit.edu> ---
(In reply to Kenneth Graunke from comment #28)
> (In reply to Ilia Mirkin from comment #27)
> > Happened upon this bug while browsing, briefly looked into it. Running that
> > shader_test on my i7-4790:
> > 
> > nouveau/nvc0: 17840 instructions, 0.88 seconds
> > i965/hsw: 16567 instructions, 72 seconds
> 
> Yeah, so that pretty much proves that it's the i965 register allocator not
> handling spilling decently.

Well, running with INTEL_DEBUG=fs there were definitely several spurts of
output which were ~seconds apart. So the register allocator might be 65 of
those seconds, but I don't think it's the whole thing.

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