The NIR nir_lower_io_arrays_to_elements pass attempts to split I/O
variables which are arrays or matrices into a sequence of separate
variables. This can help link-time optimization by allowing us to
remove varyings at a more granular level.
Shader-db results on Kaby Lake:
total instructions in shared programs: 15177645 -> 15168494 (-0.06%)
instructions in affected programs: 79857 -> 70706 (-11.46%)
helped: 392
HURT: 0
---
src/intel/compiler/brw_nir.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/src/intel/compiler/brw_nir.c b/src/intel/compiler/brw_nir.c
index 5990427b731..99ef6bec77f 100644
--- a/src/intel/compiler/brw_nir.c
+++ b/src/intel/compiler/brw_nir.c
@@ -709,6 +709,10 @@ void
brw_nir_link_shaders(const struct brw_compiler *compiler,
nir_shader **producer, nir_shader **consumer)
{
+ nir_lower_io_arrays_to_elements(*producer, *consumer);
+ nir_validate_shader(*producer);
+ nir_validate_shader(*consumer);
+
NIR_PASS_V(*producer, nir_remove_dead_variables, nir_var_shader_out);
NIR_PASS_V(*consumer, nir_remove_dead_variables, nir_var_shader_in);
--
2.17.1
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