glsl: Unify ir_constant::const_elements and ::components

There was no reason to treat array types and record types differently.
Unifying them saves a bunch of code and saves a few bytes in every
ir_constant.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>
Reviewed-by: Elie Tournier <elie.tournier@collabora.com>

src/compiler/glsl/glsl_to_nir.cpp

@@ -285,17 +285,6 @@ constant_copy(ir_constant *ir, void *mem_ctx)
       break;
 
    case GLSL_TYPE_STRUCT:
-      ret->elements = ralloc_array(mem_ctx, nir_constant *,
-                                   ir->type->length);
-      ret->num_elements = ir->type->length;
-
-      i = 0;
-      foreach_in_list(ir_constant, field, &ir->components) {
-         ret->elements[i] = constant_copy(field, mem_ctx);
-         i++;
-      }
-      break;
-
    case GLSL_TYPE_ARRAY:
       ret->elements = ralloc_array(mem_ctx, nir_constant *,
                                    ir->type->length);

src/compiler/glsl/ir.cpp

@@ -759,7 +759,12 @@ ir_constant::ir_constant(const struct glsl_type *type, exec_list *value_list)
    assert(type->is_scalar() || type->is_vector() || type->is_matrix()
 	  || type->is_record() || type->is_array());
 
-   if (type->is_array()) {
+   /* If the constant is a record, the types of each of the entries in
+    * value_list must be a 1-for-1 match with the structure components.  Each
+    * entry must also be a constant.  Just move the nodes from the value_list
+    * to the list in the ir_constant.
+    */
+   if (type->is_array() || type->is_record()) {
       this->const_elements = ralloc_array(this, ir_constant *, type->length);
       unsigned i = 0;
       foreach_in_list(ir_constant, value, value_list) {
@@ -770,20 +775,6 @@ ir_constant::ir_constant(const struct glsl_type *type, exec_list *value_list)
       return;
    }
 
-   /* If the constant is a record, the types of each of the entries in
-    * value_list must be a 1-for-1 match with the structure components.  Each
-    * entry must also be a constant.  Just move the nodes from the value_list
-    * to the list in the ir_constant.
-    */
-   /* FINISHME: Should there be some type checking and / or assertions here? */
-   /* FINISHME: Should the new constant take ownership of the nodes from
-    * FINISHME: value_list, or should it make copies?
-    */
-   if (type->is_record()) {
-      value_list->move_nodes_to(& this->components);
-      return;
-   }
-
    for (unsigned i = 0; i < 16; i++) {
       this->value.u[i] = 0;
    }
@@ -931,9 +922,11 @@ ir_constant::zero(void *mem_ctx, const glsl_type *type)
    }
 
    if (type->is_record()) {
+      c->const_elements = ralloc_array(c, ir_constant *, type->length);
+
       for (unsigned i = 0; i < type->length; i++) {
-	 ir_constant *comp = ir_constant::zero(mem_ctx, type->fields.structure[i].type);
-	 c->components.push_tail(comp);
+         c->const_elements[i] =
+            ir_constant::zero(mem_ctx, type->fields.structure[i].type);
       }
    }
 
@@ -1106,24 +1099,10 @@ ir_constant::get_array_element(unsigned i) const
 ir_constant *
 ir_constant::get_record_field(int idx)
 {
-   if (idx < 0)
-      return NULL;
+   assert(this->type->is_record());
+   assert(idx >= 0 && idx < this->type->length);
 
-   if (this->components.is_empty())
-      return NULL;
-
-   exec_node *node = this->components.get_head_raw();
-   for (int i = 0; i < idx; i++) {
-      node = node->next;
-
-      /* If the end of the list is encountered before the element matching the
-       * requested field is found, return NULL.
-       */
-      if (node->is_tail_sentinel())
-	 return NULL;
-   }
-
-   return (ir_constant *) node;
+   return const_elements[idx];
 }
 
 void
@@ -1169,15 +1148,7 @@ ir_constant::copy_offset(ir_constant *src, int offset)
       break;
    }
 
-   case GLSL_TYPE_STRUCT: {
-      assert (src->type == this->type);
-      this->components.make_empty();
-      foreach_in_list(ir_constant, orig, &src->components) {
-	 this->components.push_tail(orig->clone(this, NULL));
-      }
-      break;
-   }
-
+   case GLSL_TYPE_STRUCT:
    case GLSL_TYPE_ARRAY: {
       assert (src->type == this->type);
       for (unsigned i = 0; i < this->type->length; i++) {
@@ -1241,7 +1212,7 @@ ir_constant::has_value(const ir_constant *c) const
    if (this->type != c->type)
       return false;
 
-   if (this->type->is_array()) {
+   if (this->type->is_array() || this->type->is_record()) {
       for (unsigned i = 0; i < this->type->length; i++) {
 	 if (!this->const_elements[i]->has_value(c->const_elements[i]))
 	    return false;
@@ -1249,26 +1220,6 @@ ir_constant::has_value(const ir_constant *c) const
       return true;
    }
 
-   if (this->type->is_record()) {
-      const exec_node *a_node = this->components.get_head_raw();
-      const exec_node *b_node = c->components.get_head_raw();
-
-      while (!a_node->is_tail_sentinel()) {
-	 assert(!b_node->is_tail_sentinel());
-
-	 const ir_constant *const a_field = (ir_constant *) a_node;
-	 const ir_constant *const b_field = (ir_constant *) b_node;
-
-	 if (!a_field->has_value(b_field))
-	    return false;
-
-	 a_node = a_node->next;
-	 b_node = b_node->next;
-      }
-
-      return true;
-   }
-
    for (unsigned i = 0; i < this->type->components(); i++) {
       switch (this->type->base_type) {
       case GLSL_TYPE_UINT:
@@ -1969,17 +1920,12 @@ steal_memory(ir_instruction *ir, void *new_ctx)
    /* The components of aggregate constants are not visited by the normal
     * visitor, so steal their values by hand.
     */
-   if (constant != NULL) {
-      if (constant->type->is_record()) {
-	 foreach_in_list(ir_constant, field, &constant->components) {
-	    steal_memory(field, ir);
-	 }
-      } else if (constant->type->is_array()) {
+   if (constant != NULL &&
+       (constant->type->is_array() || constant->type->is_record())) {
       for (unsigned int i = 0; i < constant->type->length; i++) {
          steal_memory(constant->const_elements[i], ir);
       }
    }
-   }
 
    ralloc_steal(new_ctx, ir);
 }

src/compiler/glsl/ir.h

@@ -2262,12 +2262,9 @@ public:
     */
    union ir_constant_data value;
 
-   /* Array elements */
+   /* Array elements and structure fields */
    ir_constant **const_elements;
 
-   /* Structure fields */
-   exec_list components;
-
 private:
    /**
     * Parameterless constructor only used by the clone method

src/compiler/glsl/ir_clone.cpp

@@ -345,21 +345,7 @@ ir_constant::clone(void *mem_ctx, struct hash_table *ht) const
    case GLSL_TYPE_IMAGE:
       return new(mem_ctx) ir_constant(this->type, &this->value);
 
-   case GLSL_TYPE_STRUCT: {
-      ir_constant *c = new(mem_ctx) ir_constant;
-
-      c->type = this->type;
-      for (const exec_node *node = this->components.get_head_raw()
-	      ; !node->is_tail_sentinel()
-	      ; node = node->next) {
-	 ir_constant *const orig = (ir_constant *) node;
-
-	 c->components.push_tail(orig->clone(mem_ctx, NULL));
-      }
-
-      return c;
-   }
-
+   case GLSL_TYPE_STRUCT:
    case GLSL_TYPE_ARRAY: {
       ir_constant *c = new(mem_ctx) ir_constant;
 

src/compiler/glsl/ir_print_visitor.cpp

@@ -469,13 +469,10 @@ void ir_print_visitor::visit(ir_constant *ir)
       for (unsigned i = 0; i < ir->type->length; i++)
 	 ir->get_array_element(i)->accept(this);
    } else if (ir->type->is_record()) {
-      ir_constant *value = (ir_constant *) ir->components.get_head();
       for (unsigned i = 0; i < ir->type->length; i++) {
 	 fprintf(f, "(%s ", ir->type->fields.structure[i].name);
-	 value->accept(this);
+         ir->get_record_field(i)->accept(this);
 	 fprintf(f, ")");
-
-	 value = (ir_constant *) value->next;
       }
    } else {
       for (unsigned i = 0; i < ir->type->components(); i++) {

src/compiler/glsl/link_uniform_initializers.cpp

@@ -206,17 +206,13 @@ set_uniform_initializer(void *mem_ctx, gl_shader_program *prog,
 {
    const glsl_type *t_without_array = type->without_array();
    if (type->is_record()) {
-      ir_constant *field_constant;
-
-      field_constant = (ir_constant *)val->components.get_head();
-
       for (unsigned int i = 0; i < type->length; i++) {
          const glsl_type *field_type = type->fields.structure[i].type;
          const char *field_name = ralloc_asprintf(mem_ctx, "%s.%s", name,
                                             type->fields.structure[i].name);
          set_uniform_initializer(mem_ctx, prog, field_name,
-                                 field_type, field_constant, boolean_true);
-         field_constant = (ir_constant *)field_constant->next;
+                                 field_type, val->get_record_field(i),
+                                 boolean_true);
       }
       return;
    } else if (t_without_array->is_record() ||

src/mesa/program/ir_to_mesa.cpp

@@ -1913,7 +1913,8 @@ ir_to_mesa_visitor::visit(ir_constant *ir)
       src_reg temp_base = get_temp(ir->type);
       dst_reg temp = dst_reg(temp_base);
 
-      foreach_in_list(ir_constant, field_value, &ir->components) {
+      for (i = 0; i < ir->type->length; i++) {
+         ir_constant *const field_value = ir->get_record_field(i);
 	 int size = type_size(field_value->type);
 
 	 assert(size > 0);

src/mesa/state_tracker/st_glsl_to_tgsi.cpp

@@ -3045,7 +3045,8 @@ glsl_to_tgsi_visitor::visit(ir_constant *ir)
       st_src_reg temp_base = get_temp(ir->type);
       st_dst_reg temp = st_dst_reg(temp_base);
 
-      foreach_in_list(ir_constant, field_value, &ir->components) {
+      for (i = 0; i < ir->type->length; i++) {
+         ir_constant *const field_value = ir->get_record_field(i);
          int size = type_size(field_value->type);
 
          assert(size > 0);