According to RenderDoc, this shaves about 15% off of one of the render
passes in the Skyrim SE frame I've been analyzing on my KBL laptop and
about 8% off the whole frame. It's a bit noisy and hard to tell with
just the DXVK HUD but there appears to be a small FPS bump in-game as
well.
---
src/intel/compiler/brw_compiler.c | 3 ++-
src/intel/compiler/brw_nir.c | 3 +++
2 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/src/intel/compiler/brw_compiler.c
b/src/intel/compiler/brw_compiler.c
index 6480dbefbf6..86bd4c6bac6 100644
--- a/src/intel/compiler/brw_compiler.c
+++ b/src/intel/compiler/brw_compiler.c
@@ -46,7 +46,8 @@
.native_integers = true, \
.use_interpolated_input_intrinsics = true, \
.vertex_id_zero_based = true, \
- .lower_base_vertex = true
+ .lower_base_vertex = true, \
+ .derivatives_safe_after_discard = true
#define COMMON_SCALAR_OPTIONS \
.lower_pack_half_2x16 = true, \
diff --git a/src/intel/compiler/brw_nir.c b/src/intel/compiler/brw_nir.c
index f4aee3d41ee..decf7e3f57b 100644
--- a/src/intel/compiler/brw_nir.c
+++ b/src/intel/compiler/brw_nir.c
@@ -664,6 +664,9 @@ brw_preprocess_nir(const struct brw_compiler *compiler,
nir_shader *nir)
nir = brw_nir_optimize(nir, compiler, is_scalar);
+ if (nir->info.stage == MESA_SHADER_FRAGMENT)
+ OPT(nir_opt_move_discards_to_top);
+
/* This needs to be run after the first optimization pass but before we
* lower indirect derefs away
*/
--
2.17.1
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