[Mesa-dev] [PATCH 6/9] i965: Use the nir_move_comparisons pass.

[Timothy Arceri]

From: Kenneth Graunke <kenneth at whitecape.org>

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 at whitecape.org>
Reviewed-by: Timothy Arceri <timothy.arceri at collabora.com>
Reviewed-by: Jason Ekstrand <jason at jlekstrand.net>
---
 src/mesa/drivers/dri/i965/brw_nir.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/mesa/drivers/dri/i965/brw_nir.c b/src/mesa/drivers/dri/i965/brw_nir.c
index 1ddf9f6..efabb40 100644
--- a/src/mesa/drivers/dri/i965/brw_nir.c
+++ b/src/mesa/drivers/dri/i965/brw_nir.c
@@ -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);
 
-- 
2.9.3