Mesa (master): nir: rework nir_link_opt_varyings()
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Wed Jan 2 01:19:32 UTC 2019
Module: Mesa
Branch: master
Commit: d828694b804b3bd28e8ef41499dc56b259fc2da2
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=d828694b804b3bd28e8ef41499dc56b259fc2da2
Author: Timothy Arceri <tarceri at itsqueeze.com>
Date: Wed Dec 19 20:09:42 2018 +1100
nir: rework nir_link_opt_varyings()
This just cleans things up a little and make things more safe for
derefs.
Tested-by: Dieter Nützel <Dieter at nuetzel-hh.de>
Reviewed-by: Eric Anholt <eric at anholt.net>
---
src/compiler/nir/nir_linking_helpers.c | 28 ++++++++++++----------------
1 file changed, 12 insertions(+), 16 deletions(-)
diff --git a/src/compiler/nir/nir_linking_helpers.c b/src/compiler/nir/nir_linking_helpers.c
index b6eaebcb6a..c52e926ecb 100644
--- a/src/compiler/nir/nir_linking_helpers.c
+++ b/src/compiler/nir/nir_linking_helpers.c
@@ -561,14 +561,8 @@ nir_link_xfb_varyings(nir_shader *producer, nir_shader *consumer)
}
static bool
-can_replace_varying(nir_intrinsic_instr *store_intr)
+can_replace_varying(nir_variable *out_var)
{
- nir_deref_instr *out_deref = nir_src_as_deref(store_intr->src[0]);
- if (out_deref->mode != nir_var_shader_out)
- return false;
-
- nir_variable *out_var = nir_deref_instr_get_variable(out_deref);
-
/* Skip types that require more complex handling.
* TODO: add support for these types.
*/
@@ -581,7 +575,7 @@ can_replace_varying(nir_intrinsic_instr *store_intr)
/* Limit this pass to scalars for now to keep things simple. Most varyings
* should have been lowered to scalars at this point anyway.
*/
- if (store_intr->num_components != 1)
+ if (!glsl_type_is_scalar(out_var->type))
return false;
if (out_var->data.location < VARYING_SLOT_VAR0 ||
@@ -592,12 +586,8 @@ can_replace_varying(nir_intrinsic_instr *store_intr)
}
static bool
-try_replace_constant_input(nir_shader *shader,
- nir_intrinsic_instr *store_intr)
+replace_constant_input(nir_shader *shader, nir_intrinsic_instr *store_intr)
{
- if (!can_replace_varying(store_intr))
- return false;
-
nir_function_impl *impl = nir_shader_get_entrypoint(shader);
nir_builder b;
@@ -671,11 +661,17 @@ nir_link_opt_varyings(nir_shader *producer, nir_shader *consumer)
if (intr->intrinsic != nir_intrinsic_store_deref)
continue;
- if (intr->src[1].ssa->parent_instr->type != nir_instr_type_load_const) {
+ nir_deref_instr *out_deref = nir_src_as_deref(intr->src[0]);
+ if (out_deref->mode != nir_var_shader_out)
+ continue;
+
+ nir_variable *out_var = nir_deref_instr_get_variable(out_deref);
+ if (!can_replace_varying(out_var))
continue;
- }
- progress |= try_replace_constant_input(consumer, intr);
+ if (intr->src[1].ssa->parent_instr->type == nir_instr_type_load_const) {
+ progress |= replace_constant_input(consumer, intr);
+ }
}
return progress;
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