[Mesa-dev] [PATCH 2/3] nir: remove unnecessary check when lowering to SSA

[Caio Marcelo de Oliveira Filho]

Only fully-qualified direct derefs, collected in direct_deref_nodes,
are checked for aliasing, so it is already known up front that they
have only array derefs of type direct.
---
 src/compiler/nir/nir_lower_vars_to_ssa.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/src/compiler/nir/nir_lower_vars_to_ssa.c b/src/compiler/nir/nir_lower_vars_to_ssa.c
index fe30c69756..4c41dd69cf 100644
--- a/src/compiler/nir/nir_lower_vars_to_ssa.c
+++ b/src/compiler/nir/nir_lower_vars_to_ssa.c
@@ -298,15 +298,16 @@ deref_may_be_aliased_node(struct deref_node *node, nir_deref *deref,
       switch (deref->child->deref_type) {
       case nir_deref_type_array: {
          nir_deref_array *arr = nir_deref_as_array(deref->child);
-         if (arr->deref_array_type == nir_deref_array_type_indirect)
-            return true;
+
+         /* This is a child of one of the derefs in direct_deref_nodes,
+          * so we know it is direct.
+          */
+         assert(arr->deref_array_type == nir_deref_array_type_direct);
 
          /* If there is an indirect at this level, we're aliased. */
          if (node->indirect)
             return true;
 
-         assert(arr->deref_array_type == nir_deref_array_type_direct);
-
          if (node->children[arr->base_offset] &&
              deref_may_be_aliased_node(node->children[arr->base_offset],
                                        deref->child, state))
-- 
2.17.0