i965/nir: enable the dead control flow optimization

total instructions in shared programs: 7541551 -> 7541381 (-0.00%)
instructions in affected programs:     3054 -> 2884 (-5.57%)
helped:                                29

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

diff --git a/src/mesa/drivers/dri/i965/brw_nir.c b/src/mesa/drivers/dri/i965/brw_nir.c
index 247b223..8f3edc5 100644 (file)
--- a/src/mesa/drivers/dri/i965/brw_nir.c
+++ b/src/mesa/drivers/dri/i965/brw_nir.c
@@ -61,6 +61,8 @@ nir_optimize(nir_shader *nir, bool is_scalar)
       nir_validate_shader(nir);
       progress |= nir_opt_constant_folding(nir);
       nir_validate_shader(nir);
+      progress |= nir_opt_dead_cf(nir);
+      nir_validate_shader(nir);
       progress |= nir_opt_remove_phis(nir);
       nir_validate_shader(nir);
       progress |= nir_opt_undef(nir);