[Bug 76749] [HSW] DOTA world lighting has no effect

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76749

--- Comment #3 from Chia-I Wu <olvaffe at gmail.com> ---
This is also reproducible on SNB.  Several other (probably unrelated) issues
are noticed on SNB when replaying the trace file from which the snapshots were
taken.

commit 9630ba6c6e754b438cf67c7d76ec1c99488df3ba
Author: Matt Turner <mattst88 at gmail.com>
Date:   Tue Mar 11 13:14:08 2014 -0700

    i965/vec4: Let dead code eliminate trim dead channels.

causes an assertion failure:

glretrace: brw_vec4_generator.cpp:184: void
brw::vec4_generator::generate_math1_gen6(brw::vec4_instruction*, brw_reg,
brw_reg): Assertion `dst.dw1.bits.writemask == 0xf' failed.

commit dc0f5099fa3cb564c25eb892fde93cacd29df8f1
Author: Matt Turner <mattst88 at gmail.com>
Date:   Tue Mar 11 13:06:20 2014 -0700

    i965/vec4: Track live ranges per-channel, not per vgrf.

causes another assertion failure:

glretrace: brw_vec4.cpp:346: bool brw::vec4_visitor::dead_code_eliminate():
Assertion `this->virtual_grf_end[inst->dst.reg] >= pc' failed.

Finally,

commit 947c828d5cbffe9640ac63103a6223112eeff27f
Author: Matt Turner <mattst88 at gmail.com>
Date:   Thu Dec 12 00:30:16 2013 -0800

    i965/fs: Add a saturation propagation optimization pass.

causes more lights to have no effect.

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