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i965: Use the nir_move_comparisons pass.

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While the below stats are encouraging this pass will also become
very usefull for avoiding regression once
brw_do_channel_expressions() and brw_do_vector_splitting() are
disabled.

On Broadwell:

total instructions in shared programs: 13078787 -> 13060898 (-0.14%)
instructions in affected programs: 1809827 -> 1791938 (-0.99%)
helped: 4527
HURT: 157

total cycles in shared programs: 256562762 -> 256590424 (0.01%)
cycles in affected programs: 159749392 -> 159777054 (0.02%)
helped: 5583
HURT: 2289

total spills in shared programs: 14929 -> 14923 (-0.04%)
spills in affected programs: 62 -> 56 (-9.68%)
helped: 1
HURT: 0

total fills in shared programs: 20144 -> 20141 (-0.01%)
fills in affected programs: 253 -> 250 (-1.19%)
helped: 1
HURT: 3

LOST:   0
GAINED: 2

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Timothy Arceri <timothy.arceri@collabora.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
This commit is contained in:
Kenneth Graunke 2016-08-08 14:44:06 -07:00 • committed by Timothy Arceri
parent b5e682a1ef
commit b4c44ff08c
1 changed files with 1 additions and 0 deletions
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1
src/mesa/drivers/dri/i965/brw_nir.c
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@ -622,6 +622,7 @@ brw_postprocess_nir(nir_shader *nir, const struct brw_compiler *compiler,
OPT_V(nir_lower_to_source_mods);
OPT(nir_copy_prop);
OPT(nir_opt_dce);
OPT(nir_opt_move_comparisons);
OPT(nir_lower_locals_to_regs);