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i965/fs: Do dead code elimination just after copy propagation.

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If we put the register coalescing in between the two, then we end up with code
sequences involving dead writes that the dead code elimination doesn't know
how to remove.  In place of making dead code elimination smart (which we
should do, too), make it less important for the moment.

shader-db results:

total instructions in shared programs: 722240 -> 721275 (-0.13%)
instructions in affected programs:     50573 -> 49608 (-1.91%)

(no shaders regressed).

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Eric Anholt
2012-10-30 16:10:14 -07:00
parent d8988f048f
commit cf26b4569a
1 changed files with 1 additions and 1 deletions
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src/mesa/drivers/dri/i965/brw_fs.cpp
+1 -1
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@@ -1925,10 +1925,10 @@ fs_visitor::run()
progress = opt_algebraic() || progress;
progress = opt_cse() || progress;
progress = opt_copy_propagate() || progress;
progress = dead_code_eliminate() || progress;
progress = register_coalesce() || progress;
progress = register_coalesce_2() || progress;
progress = compute_to_mrf() || progress;
progress = dead_code_eliminate() || progress;
} while (progress);
remove_dead_constants();