Mesa (master): anv/i965: make use of nir_link_constant_varyings()

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Module: Mesa
Branch: master
Commit: 3561108de089f383bb7733eaf49e3d517994b51c
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=3561108de089f383bb7733eaf49e3d517994b51c

Author: Timothy Arceri <tarceri at itsqueeze.com>
Date:   Wed Nov  7 14:29:18 2018 +1100

anv/i965: make use of nir_link_constant_varyings()

shader-db results for SLK:

total instructions in shared programs: 13106498 -> 13091573 (-0.11%)
instructions in affected programs: 1186244 -> 1171319 (-1.26%)
helped: 6186
HURT: 0

total cycles in shared programs: 332062633 -> 331961653 (-0.03%)
cycles in affected programs: 8537165 -> 8436185 (-1.18%)
helped: 5371
HURT: 862

LOST:   6
GAINED: 14

Reviewed-by: Jason Ekstrand <jason at jlekstrand.net>

---

 src/intel/compiler/brw_nir.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/intel/compiler/brw_nir.c b/src/intel/compiler/brw_nir.c
index 26a5ea0460..80fa5a1a81 100644
--- a/src/intel/compiler/brw_nir.c
+++ b/src/intel/compiler/brw_nir.c
@@ -740,6 +740,9 @@ brw_nir_link_shaders(const struct brw_compiler *compiler,
       *consumer = brw_nir_optimize(*consumer, compiler, c_is_scalar, false);
    }
 
+   if (nir_link_constant_varyings(*producer, *consumer))
+      *consumer = brw_nir_optimize(*consumer, compiler, c_is_scalar, false);
+
    NIR_PASS_V(*producer, nir_remove_dead_variables, nir_var_shader_out);
    NIR_PASS_V(*consumer, nir_remove_dead_variables, nir_var_shader_in);