intel/nir: Use nir_shrink_vec_array_vars

Shader-db results on Kaby Lake:

    total instructions in shared programs: 15177605 -> 15176765 (<.01%)
    instructions in affected programs: 4259 -> 3419 (-19.72%)
    helped: 1
    HURT: 0

    total spills in shared programs: 10954 -> 10855 (-0.90%)
    spills in affected programs: 295 -> 196 (-33.56%)
    helped: 1
    HURT: 0

    total fills in shared programs: 22222 -> 22117 (-0.47%)
    fills in affected programs: 417 -> 312 (-25.18%)
    helped: 1
    HURT: 0

The helped shader is from the OglCSDof synmark test.  On my Kaby Lake
laptop, the actual framerate of the benchmark didn't appear to improve
beyond the noise.

Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>

diff --git a/src/intel/compiler/brw_nir.c b/src/intel/compiler/brw_nir.c
index cb5f18e..c9a92c8 100644 (file)
--- a/src/intel/compiler/brw_nir.c
+++ b/src/intel/compiler/brw_nir.c
@@ -542,6 +542,7 @@ brw_nir_optimize(nir_shader *nir, const struct brw_compiler *compiler,
    do {
       progress = false;
       OPT(nir_split_array_vars, nir_var_local);
+      OPT(nir_shrink_vec_array_vars, nir_var_local);
       OPT(nir_lower_vars_to_ssa);
       OPT(nir_opt_copy_prop_vars);