nir: Use nir_builder in nir_lower_io's get_io_offset().
[mesa.git] / src / glsl / nir / glsl_to_nir.cpp
index 06f50ac63026cbb174641cda4590b647f3270b8d..77327b6c74f133b59d9164d788412447b8cb5387 100644 (file)
@@ -43,7 +43,7 @@ namespace {
 class nir_visitor : public ir_visitor
 {
 public:
-   nir_visitor(nir_shader *shader, bool supports_ints);
+   nir_visitor(nir_shader *shader, gl_shader_stage stage);
    ~nir_visitor();
 
    virtual void visit(ir_variable *);
@@ -65,6 +65,7 @@ public:
    virtual void visit(ir_dereference_variable *);
    virtual void visit(ir_dereference_record *);
    virtual void visit(ir_dereference_array *);
+   virtual void visit(ir_barrier *);
 
    void create_function(ir_function *ir);
 
@@ -83,10 +84,13 @@ private:
    bool supports_ints;
 
    nir_shader *shader;
+   gl_shader_stage stage;
    nir_function_impl *impl;
    exec_list *cf_node_list;
    nir_instr *result; /* result of the expression tree last visited */
 
+   nir_deref_var *evaluate_deref(nir_instr *mem_ctx, ir_instruction *ir);
+
    /* the head of the dereference chain we're creating */
    nir_deref_var *deref_head;
    /* the tail of the dereference chain we're creating */
@@ -125,34 +129,23 @@ private:
 }; /* end of anonymous namespace */
 
 nir_shader *
-glsl_to_nir(exec_list *ir, _mesa_glsl_parse_state *state,
-            bool native_integers)
+glsl_to_nir(struct gl_shader *sh, const nir_shader_compiler_options *options)
 {
-   nir_shader *shader = nir_shader_create(NULL);
-
-   if (state) {
-      shader->num_user_structures = state->num_user_structures;
-      shader->user_structures = ralloc_array(shader, glsl_type *,
-                                             shader->num_user_structures);
-      memcpy(shader->user_structures, state->user_structures,
-            shader->num_user_structures * sizeof(glsl_type *));
-   } else {
-      shader->num_user_structures = 0;
-      shader->user_structures = NULL;
-   }
+   nir_shader *shader = nir_shader_create(NULL, options);
 
-   nir_visitor v1(shader, native_integers);
+   nir_visitor v1(shader, sh->Stage);
    nir_function_visitor v2(&v1);
-   v2.run(ir);
-   visit_exec_list(ir, &v1);
+   v2.run(sh->ir);
+   visit_exec_list(sh->ir, &v1);
 
    return shader;
 }
 
-nir_visitor::nir_visitor(nir_shader *shader, bool supports_ints)
+nir_visitor::nir_visitor(nir_shader *shader, gl_shader_stage stage)
 {
-   this->supports_ints = supports_ints;
+   this->supports_ints = shader->options->native_integers;
    this->shader = shader;
+   this->stage = stage;
    this->is_global = true;
    this->var_table = _mesa_hash_table_create(NULL, _mesa_hash_pointer,
                                              _mesa_key_pointer_equal);
@@ -166,6 +159,14 @@ nir_visitor::~nir_visitor()
    _mesa_hash_table_destroy(this->overload_table, NULL);
 }
 
+nir_deref_var *
+nir_visitor::evaluate_deref(nir_instr *mem_ctx, ir_instruction *ir)
+{
+   ir->accept(this);
+   ralloc_steal(mem_ctx, this->deref_head);
+   return this->deref_head;
+}
+
 static nir_constant *
 constant_copy(ir_constant *ir, void *mem_ctx)
 {
@@ -216,8 +217,7 @@ constant_copy(ir_constant *ir, void *mem_ctx)
       break;
 
    default:
-      assert(0);
-      break;
+      unreachable("not reached");
    }
 
    return ret;
@@ -243,6 +243,7 @@ nir_visitor::visit(ir_variable *ir)
    var->data.centroid = ir->data.centroid;
    var->data.sample = ir->data.sample;
    var->data.invariant = ir->data.invariant;
+   var->data.location = ir->data.location;
 
    switch(ir->data.mode) {
    case ir_var_auto:
@@ -261,7 +262,14 @@ nir_visitor::visit(ir_variable *ir)
       break;
 
    case ir_var_shader_in:
-      var->data.mode = nir_var_shader_in;
+      if (stage == MESA_SHADER_FRAGMENT &&
+          ir->data.location == VARYING_SLOT_FACE) {
+         /* For whatever reason, GLSL IR makes gl_FrontFacing an input */
+         var->data.location = SYSTEM_VALUE_FRONT_FACE;
+         var->data.mode = nir_var_system_value;
+      } else {
+         var->data.mode = nir_var_shader_in;
+      }
       break;
 
    case ir_var_shader_out:
@@ -272,14 +280,16 @@ nir_visitor::visit(ir_variable *ir)
       var->data.mode = nir_var_uniform;
       break;
 
+   case ir_var_shader_storage:
+      var->data.mode = nir_var_shader_storage;
+      break;
 
    case ir_var_system_value:
       var->data.mode = nir_var_system_value;
       break;
 
    default:
-      assert(0);
-      break;
+      unreachable("not reached");
    }
 
    var->data.interpolation = ir->data.interpolation;
@@ -311,11 +321,9 @@ nir_visitor::visit(ir_variable *ir)
       var->data.depth_layout = nir_depth_layout_unchanged;
       break;
    default:
-      assert(0);
-      break;
+      unreachable("not reached");
    }
 
-   var->data.location = ir->data.location;
    var->data.index = ir->data.index;
    var->data.binding = ir->data.binding;
    /* XXX Get rid of buffer_index */
@@ -344,7 +352,6 @@ nir_visitor::visit(ir_variable *ir)
       var->state_slots = NULL;
    }
 
-   var->constant_value = constant_copy(ir->constant_value, var);
    var->constant_initializer = constant_copy(ir->constant_initializer, var);
 
    var->interface_type = ir->get_interface_type();
@@ -359,15 +366,16 @@ nir_visitor::visit(ir_variable *ir)
       break;
 
    case nir_var_shader_in:
-      _mesa_hash_table_insert(shader->inputs, var->name, var);
+      exec_list_push_tail(&shader->inputs, &var->node);
       break;
 
    case nir_var_shader_out:
-      _mesa_hash_table_insert(shader->outputs, var->name, var);
+      exec_list_push_tail(&shader->outputs, &var->node);
       break;
 
    case nir_var_uniform:
-      _mesa_hash_table_insert(shader->uniforms, var->name, var);
+   case nir_var_shader_storage:
+      exec_list_push_tail(&shader->uniforms, &var->node);
       break;
 
    case nir_var_system_value:
@@ -375,8 +383,7 @@ nir_visitor::visit(ir_variable *ir)
       break;
 
    default:
-      assert(0);
-      break;
+      unreachable("not reached");
    }
 
    _mesa_hash_table_insert(var_table, ir, var);
@@ -430,8 +437,7 @@ nir_visitor::create_overload(ir_function_signature *ir, nir_function *function)
          break;
 
       default:
-         assert(0);
-         break;
+         unreachable("not reached");
       }
 
       overload->params[i].type = param->type;
@@ -539,8 +545,14 @@ nir_visitor::visit(ir_discard *ir)
     * discards will be immediately followed by a return.
     */
 
-   nir_intrinsic_instr *discard =
-      nir_intrinsic_instr_create(this->shader, nir_intrinsic_discard);
+   nir_intrinsic_instr *discard;
+   if (ir->condition) {
+      discard = nir_intrinsic_instr_create(this->shader,
+                                           nir_intrinsic_discard_if);
+      discard->src[0] = evaluate_rvalue(ir->condition);
+   } else {
+      discard = nir_intrinsic_instr_create(this->shader, nir_intrinsic_discard);
+   }
    nir_instr_insert_after_cf_list(this->cf_node_list, &discard->instr);
 }
 
@@ -574,8 +586,7 @@ nir_visitor::visit(ir_loop_jump *ir)
       type = nir_jump_continue;
       break;
    default:
-      assert(0);
-      break;
+      unreachable("not reached");
    }
 
    nir_jump_instr *instr = nir_jump_instr_create(this->shader, type);
@@ -586,13 +597,11 @@ void
 nir_visitor::visit(ir_return *ir)
 {
    if (ir->value != NULL) {
-      ir->value->accept(this);
       nir_intrinsic_instr *copy =
          nir_intrinsic_instr_create(this->shader, nir_intrinsic_copy_var);
 
-      copy->variables[0] = nir_deref_var_create(this->shader,
-                                                this->impl->return_var);
-      copy->variables[1] = this->deref_head;
+      copy->variables[0] = nir_deref_var_create(copy, this->impl->return_var);
+      copy->variables[1] = evaluate_deref(&copy->instr, ir->value);
    }
 
    nir_jump_instr *instr = nir_jump_instr_create(this->shader, nir_jump_return);
@@ -610,29 +619,135 @@ nir_visitor::visit(ir_call *ir)
          op = nir_intrinsic_atomic_counter_inc_var;
       } else if (strcmp(ir->callee_name(), "__intrinsic_atomic_predecrement") == 0) {
          op = nir_intrinsic_atomic_counter_dec_var;
+      } else if (strcmp(ir->callee_name(), "__intrinsic_image_load") == 0) {
+         op = nir_intrinsic_image_load;
+      } else if (strcmp(ir->callee_name(), "__intrinsic_image_store") == 0) {
+         op = nir_intrinsic_image_store;
+      } else if (strcmp(ir->callee_name(), "__intrinsic_image_atomic_add") == 0) {
+         op = nir_intrinsic_image_atomic_add;
+      } else if (strcmp(ir->callee_name(), "__intrinsic_image_atomic_min") == 0) {
+         op = nir_intrinsic_image_atomic_min;
+      } else if (strcmp(ir->callee_name(), "__intrinsic_image_atomic_max") == 0) {
+         op = nir_intrinsic_image_atomic_max;
+      } else if (strcmp(ir->callee_name(), "__intrinsic_image_atomic_and") == 0) {
+         op = nir_intrinsic_image_atomic_and;
+      } else if (strcmp(ir->callee_name(), "__intrinsic_image_atomic_or") == 0) {
+         op = nir_intrinsic_image_atomic_or;
+      } else if (strcmp(ir->callee_name(), "__intrinsic_image_atomic_xor") == 0) {
+         op = nir_intrinsic_image_atomic_xor;
+      } else if (strcmp(ir->callee_name(), "__intrinsic_image_atomic_exchange") == 0) {
+         op = nir_intrinsic_image_atomic_exchange;
+      } else if (strcmp(ir->callee_name(), "__intrinsic_image_atomic_comp_swap") == 0) {
+         op = nir_intrinsic_image_atomic_comp_swap;
+      } else if (strcmp(ir->callee_name(), "__intrinsic_memory_barrier") == 0) {
+         op = nir_intrinsic_memory_barrier;
       } else {
-         assert(0);
+         unreachable("not reached");
       }
 
       nir_intrinsic_instr *instr = nir_intrinsic_instr_create(shader, op);
-      ir_dereference *param =
-         (ir_dereference *) ir->actual_parameters.get_head();
-      param->accept(this);
-      instr->variables[0] = this->deref_head;
-      instr->dest.is_ssa = true;
-      nir_ssa_def_init(&instr->instr, &instr->dest.ssa, 1, NULL);
+
+      switch (op) {
+      case nir_intrinsic_atomic_counter_read_var:
+      case nir_intrinsic_atomic_counter_inc_var:
+      case nir_intrinsic_atomic_counter_dec_var: {
+         ir_dereference *param =
+            (ir_dereference *) ir->actual_parameters.get_head();
+         instr->variables[0] = evaluate_deref(&instr->instr, param);
+         nir_ssa_dest_init(&instr->instr, &instr->dest, 1, NULL);
+         break;
+      }
+      case nir_intrinsic_image_load:
+      case nir_intrinsic_image_store:
+      case nir_intrinsic_image_atomic_add:
+      case nir_intrinsic_image_atomic_min:
+      case nir_intrinsic_image_atomic_max:
+      case nir_intrinsic_image_atomic_and:
+      case nir_intrinsic_image_atomic_or:
+      case nir_intrinsic_image_atomic_xor:
+      case nir_intrinsic_image_atomic_exchange:
+      case nir_intrinsic_image_atomic_comp_swap: {
+         nir_ssa_undef_instr *instr_undef =
+            nir_ssa_undef_instr_create(shader, 1);
+         nir_instr_insert_after_cf_list(this->cf_node_list,
+                                        &instr_undef->instr);
+
+         /* Set the image variable dereference. */
+         exec_node *param = ir->actual_parameters.get_head();
+         ir_dereference *image = (ir_dereference *)param;
+         const glsl_type *type =
+            image->variable_referenced()->type->without_array();
+
+         instr->variables[0] = evaluate_deref(&instr->instr, image);
+         param = param->get_next();
+
+         /* Set the address argument, extending the coordinate vector to four
+          * components.
+          */
+         const nir_src src_addr = evaluate_rvalue((ir_dereference *)param);
+         nir_alu_instr *instr_addr = nir_alu_instr_create(shader, nir_op_vec4);
+         nir_ssa_dest_init(&instr_addr->instr, &instr_addr->dest.dest, 4, NULL);
+
+         for (int i = 0; i < 4; i++) {
+            if (i < type->coordinate_components()) {
+               instr_addr->src[i].src = src_addr;
+               instr_addr->src[i].swizzle[0] = i;
+            } else {
+               instr_addr->src[i].src = nir_src_for_ssa(&instr_undef->def);
+            }
+         }
+
+         nir_instr_insert_after_cf_list(cf_node_list, &instr_addr->instr);
+         instr->src[0] = nir_src_for_ssa(&instr_addr->dest.dest.ssa);
+         param = param->get_next();
+
+         /* Set the sample argument, which is undefined for single-sample
+          * images.
+          */
+         if (type->sampler_dimensionality == GLSL_SAMPLER_DIM_MS) {
+            instr->src[1] = evaluate_rvalue((ir_dereference *)param);
+            param = param->get_next();
+         } else {
+            instr->src[1] = nir_src_for_ssa(&instr_undef->def);
+         }
+
+         /* Set the intrinsic parameters. */
+         if (!param->is_tail_sentinel()) {
+            instr->src[2] = evaluate_rvalue((ir_dereference *)param);
+            param = param->get_next();
+         }
+
+         if (!param->is_tail_sentinel()) {
+            instr->src[3] = evaluate_rvalue((ir_dereference *)param);
+            param = param->get_next();
+         }
+
+         /* Set the intrinsic destination. */
+         if (ir->return_deref)
+            nir_ssa_dest_init(&instr->instr, &instr->dest,
+                              ir->return_deref->type->vector_elements, NULL);
+         break;
+      }
+      case nir_intrinsic_memory_barrier:
+         break;
+      default:
+         unreachable("not reached");
+      }
 
       nir_instr_insert_after_cf_list(this->cf_node_list, &instr->instr);
 
-      nir_intrinsic_instr *store_instr =
-         nir_intrinsic_instr_create(shader, nir_intrinsic_store_var_vec1);
+      if (ir->return_deref) {
+         nir_intrinsic_instr *store_instr =
+            nir_intrinsic_instr_create(shader, nir_intrinsic_store_var);
+         store_instr->num_components = ir->return_deref->type->vector_elements;
 
-      ir->return_deref->accept(this);
-      store_instr->variables[0] = this->deref_head;
-      store_instr->src[0].is_ssa = true;
-      store_instr->src[0].ssa = &instr->dest.ssa;
+         store_instr->variables[0] =
+            evaluate_deref(&store_instr->instr, ir->return_deref);
+         store_instr->src[0] = nir_src_for_ssa(&instr->dest.ssa);
 
-      nir_instr_insert_after_cf_list(this->cf_node_list, &store_instr->instr);
+         nir_instr_insert_after_cf_list(this->cf_node_list,
+                                        &store_instr->instr);
+      }
 
       return;
    }
@@ -646,13 +761,11 @@ nir_visitor::visit(ir_call *ir)
 
    unsigned i = 0;
    foreach_in_list(ir_dereference, param, &ir->actual_parameters) {
-      param->accept(this);
-      instr->params[i] = this->deref_head;
+      instr->params[i] = evaluate_deref(&instr->instr, param);
       i++;
    }
 
-   ir->return_deref->accept(this);
-   instr->return_deref = this->deref_head;
+   instr->return_deref = evaluate_deref(&instr->instr, ir->return_deref);
    nir_instr_insert_after_cf_list(this->cf_node_list, &instr->instr);
 }
 
@@ -667,12 +780,8 @@ nir_visitor::visit(ir_assignment *ir)
       nir_intrinsic_instr *copy =
          nir_intrinsic_instr_create(this->shader, nir_intrinsic_copy_var);
 
-      ir->lhs->accept(this);
-      copy->variables[0] = this->deref_head;
-
-      ir->rhs->accept(this);
-      copy->variables[1] = this->deref_head;
-
+      copy->variables[0] = evaluate_deref(&copy->instr, ir->lhs);
+      copy->variables[1] = evaluate_deref(&copy->instr, ir->rhs);
 
       if (ir->condition) {
          nir_if *if_stmt = nir_if_create(this->shader);
@@ -699,21 +808,12 @@ nir_visitor::visit(ir_assignment *ir)
        * back into the LHS. Copy propagation should get rid of the mess.
        */
 
-      nir_intrinsic_op load_op;
-      switch (ir->lhs->type->vector_elements) {
-         case 1: load_op = nir_intrinsic_load_var_vec1; break;
-         case 2: load_op = nir_intrinsic_load_var_vec2; break;
-         case 3: load_op = nir_intrinsic_load_var_vec3; break;
-         case 4: load_op = nir_intrinsic_load_var_vec4; break;
-         default: unreachable("Invalid number of components"); break;
-      }
-
-      nir_intrinsic_instr *load = nir_intrinsic_instr_create(this->shader,
-                                                             load_op);
-      load->dest.is_ssa = true;
-      nir_ssa_def_init(&load->instr, &load->dest.ssa,
-                       num_components, NULL);
+      nir_intrinsic_instr *load =
+         nir_intrinsic_instr_create(this->shader, nir_intrinsic_load_var);
+      load->num_components = ir->lhs->type->vector_elements;
+      nir_ssa_dest_init(&load->instr, &load->dest, num_components, NULL);
       load->variables[0] = lhs_deref;
+      ralloc_steal(load, load->variables[0]);
       nir_instr_insert_after_cf_list(this->cf_node_list, &load->instr);
 
       nir_op vec_op;
@@ -725,9 +825,7 @@ nir_visitor::visit(ir_assignment *ir)
          default: unreachable("Invalid number of components"); break;
       }
       nir_alu_instr *vec = nir_alu_instr_create(this->shader, vec_op);
-      vec->dest.dest.is_ssa = true;
-      nir_ssa_def_init(&vec->instr, &vec->dest.dest.ssa,
-                       num_components, NULL);
+      nir_ssa_dest_init(&vec->instr, &vec->dest.dest, num_components, NULL);
       vec->dest.write_mask = (1 << num_components) - 1;
 
       unsigned component = 0;
@@ -754,18 +852,10 @@ nir_visitor::visit(ir_assignment *ir)
       src.ssa = &vec->dest.dest.ssa;
    }
 
-   nir_intrinsic_op store_op;
-   switch (ir->lhs->type->vector_elements) {
-      case 1: store_op = nir_intrinsic_store_var_vec1; break;
-      case 2: store_op = nir_intrinsic_store_var_vec2; break;
-      case 3: store_op = nir_intrinsic_store_var_vec3; break;
-      case 4: store_op = nir_intrinsic_store_var_vec4; break;
-      default: unreachable("Invalid number of components"); break;
-   }
-
-   nir_intrinsic_instr *store = nir_intrinsic_instr_create(this->shader,
-                                                           store_op);
-   nir_deref *store_deref = nir_copy_deref(this->shader, &lhs_deref->deref);
+   nir_intrinsic_instr *store =
+      nir_intrinsic_instr_create(this->shader, nir_intrinsic_store_var);
+   store->num_components = ir->lhs->type->vector_elements;
+   nir_deref *store_deref = nir_copy_deref(store, &lhs_deref->deref);
    store->variables[0] = nir_deref_as_var(store_deref);
    store->src[0] = src;
 
@@ -791,7 +881,6 @@ get_instr_dest(nir_instr *instr)
    nir_alu_instr *alu_instr;
    nir_intrinsic_instr *intrinsic_instr;
    nir_tex_instr *tex_instr;
-   nir_load_const_instr *load_const_instr;
 
    switch (instr->type) {
       case nir_instr_type_alu:
@@ -805,17 +894,12 @@ get_instr_dest(nir_instr *instr)
          else
             return NULL;
 
-      case nir_instr_type_texture:
-         tex_instr = nir_instr_as_texture(instr);
+      case nir_instr_type_tex:
+         tex_instr = nir_instr_as_tex(instr);
          return &tex_instr->dest;
 
-      case nir_instr_type_load_const:
-         load_const_instr = nir_instr_as_load_const(instr);
-         return &load_const_instr->dest;
-
       default:
-         assert(0);
-         break;
+         unreachable("not reached");
    }
 
    return NULL;
@@ -826,8 +910,7 @@ nir_visitor::add_instr(nir_instr *instr, unsigned num_components)
 {
    nir_dest *dest = get_instr_dest(instr);
 
-   dest->is_ssa = true;
-   nir_ssa_def_init(instr, &dest->ssa, num_components, NULL);
+   nir_ssa_dest_init(instr, dest, num_components, NULL);
 
    nir_instr_insert_after_cf_list(this->cf_node_list, instr);
    this->result = instr;
@@ -843,29 +926,18 @@ nir_visitor::evaluate_rvalue(ir_rvalue* ir)
        * must emit a variable load.
        */
 
-      nir_intrinsic_op load_op;
-      switch (ir->type->vector_elements) {
-      case 1: load_op = nir_intrinsic_load_var_vec1; break;
-      case 2: load_op = nir_intrinsic_load_var_vec2; break;
-      case 3: load_op = nir_intrinsic_load_var_vec3; break;
-      case 4: load_op = nir_intrinsic_load_var_vec4; break;
-      default: unreachable("Invalid number of components");
-      }
-
       nir_intrinsic_instr *load_instr =
-         nir_intrinsic_instr_create(this->shader, load_op);
+         nir_intrinsic_instr_create(this->shader, nir_intrinsic_load_var);
+      load_instr->num_components = ir->type->vector_elements;
       load_instr->variables[0] = this->deref_head;
+      ralloc_steal(load_instr, load_instr->variables[0]);
       add_instr(&load_instr->instr, ir->type->vector_elements);
    }
 
    nir_dest *dest = get_instr_dest(this->result);
-
    assert(dest->is_ssa);
-   nir_src src;
-   src.is_ssa = true;
-   src.ssa = &dest->ssa;
 
-   return src;
+   return nir_src_for_ssa(&dest->ssa);
 }
 
 nir_alu_instr *
@@ -907,33 +979,24 @@ nir_visitor::emit(nir_op op, unsigned dest_size, nir_src src1,
 void
 nir_visitor::visit(ir_expression *ir)
 {
-   if (ir->operation == ir_binop_ubo_load) {
+   /* Some special cases */
+   switch (ir->operation) {
+   case ir_binop_ubo_load: {
       ir_constant *const_index = ir->operands[1]->as_constant();
 
       nir_intrinsic_op op;
       if (const_index) {
-         switch (ir->type->vector_elements) {
-            case 1: op = nir_intrinsic_load_ubo_vec1; break;
-            case 2: op = nir_intrinsic_load_ubo_vec2; break;
-            case 3: op = nir_intrinsic_load_ubo_vec3; break;
-            case 4: op = nir_intrinsic_load_ubo_vec4; break;
-            default: assert(0); break;
-         }
+         op = nir_intrinsic_load_ubo;
       } else {
-         switch (ir->type->vector_elements) {
-            case 1: op = nir_intrinsic_load_ubo_vec1_indirect; break;
-            case 2: op = nir_intrinsic_load_ubo_vec2_indirect; break;
-            case 3: op = nir_intrinsic_load_ubo_vec3_indirect; break;
-            case 4: op = nir_intrinsic_load_ubo_vec4_indirect; break;
-            default: assert(0); break;
-         }
+         op = nir_intrinsic_load_ubo_indirect;
       }
       nir_intrinsic_instr *load = nir_intrinsic_instr_create(this->shader, op);
-      load->const_index[0] = ir->operands[0]->as_constant()->value.u[0];
-      load->const_index[1] = const_index ? const_index->value.u[0] : 0; /* base offset */
-      load->const_index[2] = 1; /* number of vec4's */
+      load->num_components = ir->type->vector_elements;
+      load->const_index[0] = const_index ? const_index->value.u[0] : 0; /* base offset */
+      load->const_index[1] = 1; /* number of vec4's */
+      load->src[0] = evaluate_rvalue(ir->operands[0]);
       if (!const_index)
-         load->src[0] = evaluate_rvalue(ir->operands[1]);
+         load->src[1] = evaluate_rvalue(ir->operands[1]);
       add_instr(&load->instr, ir->type->vector_elements);
 
       /*
@@ -942,18 +1005,15 @@ nir_visitor::visit(ir_expression *ir)
        */
 
       if (ir->type->base_type == GLSL_TYPE_BOOL) {
-         nir_load_const_instr *const_zero = nir_load_const_instr_create(shader);
-         const_zero->num_components = 1;
+         nir_load_const_instr *const_zero = nir_load_const_instr_create(shader, 1);
          const_zero->value.u[0] = 0;
-         const_zero->dest.is_ssa = true;
-         nir_ssa_def_init(&const_zero->instr, &const_zero->dest.ssa, 1, NULL);
          nir_instr_insert_after_cf_list(this->cf_node_list, &const_zero->instr);
 
          nir_alu_instr *compare = nir_alu_instr_create(shader, nir_op_ine);
          compare->src[0].src.is_ssa = true;
          compare->src[0].src.ssa = &load->dest.ssa;
          compare->src[1].src.is_ssa = true;
-         compare->src[1].src.ssa = &const_zero->dest.ssa;
+         compare->src[1].src.ssa = &const_zero->def;
          for (unsigned i = 0; i < ir->type->vector_elements; i++)
             compare->src[1].swizzle[i] = 0;
          compare->dest.write_mask = (1 << ir->type->vector_elements) - 1;
@@ -964,6 +1024,83 @@ nir_visitor::visit(ir_expression *ir)
       return;
    }
 
+   case ir_unop_interpolate_at_centroid:
+   case ir_binop_interpolate_at_offset:
+   case ir_binop_interpolate_at_sample: {
+      ir_dereference *deref = ir->operands[0]->as_dereference();
+      ir_swizzle *swizzle = NULL;
+      if (!deref) {
+         /* the api does not allow a swizzle here, but the varying packing code
+          * may have pushed one into here.
+          */
+         swizzle = ir->operands[0]->as_swizzle();
+         assert(swizzle);
+         deref = swizzle->val->as_dereference();
+         assert(deref);
+      }
+
+      deref->accept(this);
+
+      nir_intrinsic_op op;
+      if (this->deref_head->var->data.mode == nir_var_shader_in) {
+         switch (ir->operation) {
+         case ir_unop_interpolate_at_centroid:
+            op = nir_intrinsic_interp_var_at_centroid;
+            break;
+         case ir_binop_interpolate_at_offset:
+            op = nir_intrinsic_interp_var_at_offset;
+            break;
+         case ir_binop_interpolate_at_sample:
+            op = nir_intrinsic_interp_var_at_sample;
+            break;
+         default:
+            unreachable("Invalid interpolation intrinsic");
+         }
+      } else {
+         /* This case can happen if the vertex shader does not write the
+          * given varying.  In this case, the linker will lower it to a
+          * global variable.  Since interpolating a variable makes no
+          * sense, we'll just turn it into a load which will probably
+          * eventually end up as an SSA definition.
+          */
+         assert(this->deref_head->var->data.mode == nir_var_global);
+         op = nir_intrinsic_load_var;
+      }
+
+      nir_intrinsic_instr *intrin = nir_intrinsic_instr_create(shader, op);
+      intrin->num_components = deref->type->vector_elements;
+      intrin->variables[0] = this->deref_head;
+      ralloc_steal(intrin, intrin->variables[0]);
+
+      if (intrin->intrinsic == nir_intrinsic_interp_var_at_offset ||
+          intrin->intrinsic == nir_intrinsic_interp_var_at_sample)
+         intrin->src[0] = evaluate_rvalue(ir->operands[1]);
+
+      add_instr(&intrin->instr, deref->type->vector_elements);
+
+      if (swizzle) {
+         nir_alu_instr *mov = nir_alu_instr_create(shader, nir_op_imov);
+         mov->dest.write_mask = (1 << swizzle->type->vector_elements) - 1;
+         mov->src[0].src.is_ssa = true;
+         mov->src[0].src.ssa = &intrin->dest.ssa;
+
+         mov->src[0].swizzle[0] = swizzle->mask.x;
+         mov->src[0].swizzle[1] = swizzle->mask.y;
+         mov->src[0].swizzle[2] = swizzle->mask.z;
+         mov->src[0].swizzle[3] = swizzle->mask.w;
+         for (unsigned i = deref->type->vector_elements; i < 4; i++)
+            mov->src[0].swizzle[i] = 0;
+
+         add_instr(&mov->instr, swizzle->type->vector_elements);
+      }
+
+      return;
+   }
+
+   default:
+      break;
+   }
+
    nir_src srcs[4];
    for (unsigned i = 0; i < ir->get_num_operands(); i++)
       srcs[i] = evaluate_rvalue(ir->operands[i]);
@@ -992,19 +1129,16 @@ nir_visitor::visit(ir_expression *ir)
       emit(supports_ints ? nir_op_inot : nir_op_fnot, dest_size, srcs);
       break;
    case ir_unop_neg:
-      instr = emit(types[0] == GLSL_TYPE_FLOAT ? nir_op_fmov : nir_op_imov,
+      instr = emit(types[0] == GLSL_TYPE_FLOAT ? nir_op_fneg : nir_op_ineg,
                    dest_size, srcs);
-      instr->src[0].negate = true;
       break;
    case ir_unop_abs:
-      instr = emit(types[0] == GLSL_TYPE_FLOAT ? nir_op_fmov : nir_op_imov,
+      instr = emit(types[0] == GLSL_TYPE_FLOAT ? nir_op_fabs : nir_op_iabs,
                    dest_size, srcs);
-      instr->src[0].abs = true;
       break;
    case ir_unop_saturate:
       assert(types[0] == GLSL_TYPE_FLOAT);
-      instr = emit(nir_op_fmov, dest_size, srcs);
-      instr->dest.saturate = true;
+      instr = emit(nir_op_fsat, dest_size, srcs);
       break;
    case ir_unop_sign:
       emit(types[0] == GLSL_TYPE_FLOAT ? nir_op_fsign : nir_op_isign,
@@ -1013,8 +1147,8 @@ nir_visitor::visit(ir_expression *ir)
    case ir_unop_rcp:  emit(nir_op_frcp, dest_size, srcs);  break;
    case ir_unop_rsq:  emit(nir_op_frsq, dest_size, srcs);  break;
    case ir_unop_sqrt: emit(nir_op_fsqrt, dest_size, srcs); break;
-   case ir_unop_exp:  emit(nir_op_fexp, dest_size, srcs);  break;
-   case ir_unop_log:  emit(nir_op_flog, dest_size, srcs);  break;
+   case ir_unop_exp:  unreachable("ir_unop_exp should have been lowered");
+   case ir_unop_log:  unreachable("ir_unop_log should have been lowered");
    case ir_unop_exp2: emit(nir_op_fexp2, dest_size, srcs); break;
    case ir_unop_log2: emit(nir_op_flog2, dest_size, srcs); break;
    case ir_unop_i2f:
@@ -1037,6 +1171,7 @@ nir_visitor::visit(ir_expression *ir)
    case ir_unop_bitcast_f2i:
    case ir_unop_bitcast_u2f:
    case ir_unop_bitcast_f2u:
+   case ir_unop_subroutine_to_int:
       /* no-op */
       emit(nir_op_imov, dest_size, srcs);
       break;
@@ -1055,8 +1190,7 @@ nir_visitor::visit(ir_expression *ir)
               dest_size, srcs);
          break;
       default:
-         assert(0);
-         break;
+         unreachable("not reached");
       }
       break;
    case ir_unop_trunc: emit(nir_op_ftrunc, dest_size, srcs); break;
@@ -1066,12 +1200,6 @@ nir_visitor::visit(ir_expression *ir)
    case ir_unop_round_even: emit(nir_op_fround_even, dest_size, srcs); break;
    case ir_unop_sin:   emit(nir_op_fsin,   dest_size, srcs); break;
    case ir_unop_cos:   emit(nir_op_fcos,   dest_size, srcs); break;
-   case ir_unop_sin_reduced:
-      emit(nir_op_fsin_reduced, dest_size, srcs);
-      break;
-   case ir_unop_cos_reduced:
-      emit(nir_op_fcos_reduced, dest_size, srcs);
-      break;
    case ir_unop_dFdx:        emit(nir_op_fddx,        dest_size, srcs); break;
    case ir_unop_dFdy:        emit(nir_op_fddy,        dest_size, srcs); break;
    case ir_unop_dFdx_fine:   emit(nir_op_fddx_fine,   dest_size, srcs); break;
@@ -1144,7 +1272,7 @@ nir_visitor::visit(ir_expression *ir)
             case 2: emit(nir_op_fnoise1_2, dest_size, srcs); break;
             case 3: emit(nir_op_fnoise1_3, dest_size, srcs); break;
             case 4: emit(nir_op_fnoise1_4, dest_size, srcs); break;
-            default: assert(0); break;
+            default: unreachable("not reached");
          }
          break;
       case 2:
@@ -1153,7 +1281,7 @@ nir_visitor::visit(ir_expression *ir)
             case 2: emit(nir_op_fnoise2_2, dest_size, srcs); break;
             case 3: emit(nir_op_fnoise2_3, dest_size, srcs); break;
             case 4: emit(nir_op_fnoise2_4, dest_size, srcs); break;
-            default: assert(0); break;
+            default: unreachable("not reached");
          }
          break;
       case 3:
@@ -1162,7 +1290,7 @@ nir_visitor::visit(ir_expression *ir)
             case 2: emit(nir_op_fnoise3_2, dest_size, srcs); break;
             case 3: emit(nir_op_fnoise3_3, dest_size, srcs); break;
             case 4: emit(nir_op_fnoise3_4, dest_size, srcs); break;
-            default: assert(0); break;
+            default: unreachable("not reached");
          }
          break;
       case 4:
@@ -1171,12 +1299,11 @@ nir_visitor::visit(ir_expression *ir)
             case 2: emit(nir_op_fnoise4_2, dest_size, srcs); break;
             case 3: emit(nir_op_fnoise4_3, dest_size, srcs); break;
             case 4: emit(nir_op_fnoise4_4, dest_size, srcs); break;
-            default: assert(0); break;
+            default: unreachable("not reached");
          }
          break;
       default:
-         assert(0);
-         break;
+         unreachable("not reached");
       }
       break;
    case ir_binop_add:
@@ -1190,6 +1317,9 @@ nir_visitor::visit(ir_expression *ir)
    case ir_binop_bit_and:
    case ir_binop_bit_or:
    case ir_binop_bit_xor:
+   case ir_binop_logic_and:
+   case ir_binop_logic_or:
+   case ir_binop_logic_xor:
    case ir_binop_lshift:
    case ir_binop_rshift:
       switch (ir->operation) {
@@ -1250,6 +1380,24 @@ nir_visitor::visit(ir_expression *ir)
       case ir_binop_bit_xor:
          op = nir_op_ixor;
          break;
+      case ir_binop_logic_and:
+         if (supports_ints)
+            op = nir_op_iand;
+         else
+            op = nir_op_fand;
+         break;
+      case ir_binop_logic_or:
+         if (supports_ints)
+            op = nir_op_ior;
+         else
+            op = nir_op_for;
+         break;
+      case ir_binop_logic_xor:
+         if (supports_ints)
+            op = nir_op_ixor;
+         else
+            op = nir_op_fxor;
+         break;
       case ir_binop_lshift:
          op = nir_op_ishl;
          break;
@@ -1264,8 +1412,7 @@ nir_visitor::visit(ir_expression *ir)
          break;
 
       default:
-         assert(0);
-         break;
+         unreachable("not reached");
       }
 
       instr = emit(op, dest_size, srcs);
@@ -1370,8 +1517,7 @@ nir_visitor::visit(ir_expression *ir)
                case 3: emit(nir_op_ball_fequal3, dest_size, srcs); break;
                case 4: emit(nir_op_ball_fequal4, dest_size, srcs); break;
                default:
-                  assert(0);
-                  break;
+                  unreachable("not reached");
             }
          } else {
             switch (ir->operands[0]->type->vector_elements) {
@@ -1380,8 +1526,7 @@ nir_visitor::visit(ir_expression *ir)
                case 3: emit(nir_op_ball_iequal3, dest_size, srcs); break;
                case 4: emit(nir_op_ball_iequal4, dest_size, srcs); break;
                default:
-                  assert(0);
-                  break;
+                  unreachable("not reached");
             }
          }
       } else {
@@ -1391,8 +1536,7 @@ nir_visitor::visit(ir_expression *ir)
             case 3: emit(nir_op_fall_equal3, dest_size, srcs); break;
             case 4: emit(nir_op_fall_equal4, dest_size, srcs); break;
             default:
-               assert(0);
-               break;
+               unreachable("not reached");
          }
       }
       break;
@@ -1405,8 +1549,7 @@ nir_visitor::visit(ir_expression *ir)
                case 3: emit(nir_op_bany_fnequal3, dest_size, srcs); break;
                case 4: emit(nir_op_bany_fnequal4, dest_size, srcs); break;
                default:
-                  assert(0);
-                  break;
+                  unreachable("not reached");
             }
          } else {
             switch (ir->operands[0]->type->vector_elements) {
@@ -1415,8 +1558,7 @@ nir_visitor::visit(ir_expression *ir)
                case 3: emit(nir_op_bany_inequal3, dest_size, srcs); break;
                case 4: emit(nir_op_bany_inequal4, dest_size, srcs); break;
                default:
-                  assert(0);
-                  break;
+                  unreachable("not reached");
             }
          }
       } else {
@@ -1426,37 +1568,17 @@ nir_visitor::visit(ir_expression *ir)
             case 3: emit(nir_op_fany_nequal3, dest_size, srcs); break;
             case 4: emit(nir_op_fany_nequal4, dest_size, srcs); break;
             default:
-               assert(0);
-               break;
+               unreachable("not reached");
          }
       }
       break;
-   case ir_binop_logic_and:
-      if (supports_ints)
-         emit(nir_op_iand, dest_size, srcs);
-      else
-         emit(nir_op_fand, dest_size, srcs);
-      break;
-   case ir_binop_logic_or:
-      if (supports_ints)
-         emit(nir_op_ior, dest_size, srcs);
-      else
-         emit(nir_op_for, dest_size, srcs);
-      break;
-   case ir_binop_logic_xor:
-      if (supports_ints)
-         emit(nir_op_ixor, dest_size, srcs);
-      else
-         emit(nir_op_fxor, dest_size, srcs);
-      break;
    case ir_binop_dot:
       switch (ir->operands[0]->type->vector_elements) {
          case 2: emit(nir_op_fdot2, dest_size, srcs); break;
          case 3: emit(nir_op_fdot3, dest_size, srcs); break;
          case 4: emit(nir_op_fdot4, dest_size, srcs); break;
          default:
-            assert(0);
-            break;
+            unreachable("not reached");
       }
       break;
 
@@ -1508,13 +1630,12 @@ nir_visitor::visit(ir_expression *ir)
          case 2: emit(nir_op_vec2, dest_size, srcs); break;
          case 3: emit(nir_op_vec3, dest_size, srcs); break;
          case 4: emit(nir_op_vec4, dest_size, srcs); break;
-         default: assert(0); break;
+         default: unreachable("not reached");
       }
       break;
 
    default:
-      assert(0);
-      break;
+      unreachable("not reached");
    }
 }
 
@@ -1589,8 +1710,7 @@ nir_visitor::visit(ir_texture *ir)
       break;
 
    default:
-      assert(0);
-      break;
+      unreachable("not reached");
    }
 
    if (ir->projector != NULL)
@@ -1620,30 +1740,29 @@ nir_visitor::visit(ir_texture *ir)
       instr->dest_type = nir_type_unsigned;
       break;
    default:
-      assert(0);
+      unreachable("not reached");
    }
 
-   ir->sampler->accept(this);
-   instr->sampler = this->deref_head;
+   instr->sampler = evaluate_deref(&instr->instr, ir->sampler);
 
    unsigned src_number = 0;
 
    if (ir->coordinate != NULL) {
       instr->coord_components = ir->coordinate->type->vector_elements;
-      instr->src[src_number] = evaluate_rvalue(ir->coordinate);
-      instr->src_type[src_number] = nir_tex_src_coord;
+      instr->src[src_number].src = evaluate_rvalue(ir->coordinate);
+      instr->src[src_number].src_type = nir_tex_src_coord;
       src_number++;
    }
 
    if (ir->projector != NULL) {
-      instr->src[src_number] = evaluate_rvalue(ir->projector);
-      instr->src_type[src_number] = nir_tex_src_projector;
+      instr->src[src_number].src = evaluate_rvalue(ir->projector);
+      instr->src[src_number].src_type = nir_tex_src_projector;
       src_number++;
    }
 
    if (ir->shadow_comparitor != NULL) {
-      instr->src[src_number] = evaluate_rvalue(ir->shadow_comparitor);
-      instr->src_type[src_number] = nir_tex_src_comparitor;
+      instr->src[src_number].src = evaluate_rvalue(ir->shadow_comparitor);
+      instr->src[src_number].src_type = nir_tex_src_comparitor;
       src_number++;
    }
 
@@ -1656,16 +1775,16 @@ nir_visitor::visit(ir_texture *ir)
          for (unsigned i = 0; i < const_offset->type->vector_elements; i++)
             instr->const_offset[i] = const_offset->value.i[i];
       } else {
-         instr->src[src_number] = evaluate_rvalue(ir->offset);
-         instr->src_type[src_number] = nir_tex_src_offset;
+         instr->src[src_number].src = evaluate_rvalue(ir->offset);
+         instr->src[src_number].src_type = nir_tex_src_offset;
          src_number++;
       }
    }
 
    switch (ir->op) {
    case ir_txb:
-      instr->src[src_number] = evaluate_rvalue(ir->lod_info.bias);
-      instr->src_type[src_number] = nir_tex_src_bias;
+      instr->src[src_number].src = evaluate_rvalue(ir->lod_info.bias);
+      instr->src[src_number].src_type = nir_tex_src_bias;
       src_number++;
       break;
 
@@ -1673,24 +1792,24 @@ nir_visitor::visit(ir_texture *ir)
    case ir_txf:
    case ir_txs:
       if (ir->lod_info.lod != NULL) {
-         instr->src[src_number] = evaluate_rvalue(ir->lod_info.lod);
-         instr->src_type[src_number] = nir_tex_src_lod;
+         instr->src[src_number].src = evaluate_rvalue(ir->lod_info.lod);
+         instr->src[src_number].src_type = nir_tex_src_lod;
          src_number++;
       }
       break;
 
    case ir_txd:
-      instr->src[src_number] = evaluate_rvalue(ir->lod_info.grad.dPdx);
-      instr->src_type[src_number] = nir_tex_src_ddx;
+      instr->src[src_number].src = evaluate_rvalue(ir->lod_info.grad.dPdx);
+      instr->src[src_number].src_type = nir_tex_src_ddx;
       src_number++;
-      instr->src[src_number] = evaluate_rvalue(ir->lod_info.grad.dPdy);
-      instr->src_type[src_number] = nir_tex_src_ddy;
+      instr->src[src_number].src = evaluate_rvalue(ir->lod_info.grad.dPdy);
+      instr->src[src_number].src_type = nir_tex_src_ddy;
       src_number++;
       break;
 
    case ir_txf_ms:
-      instr->src[src_number] = evaluate_rvalue(ir->lod_info.sample_index);
-      instr->src_type[src_number] = nir_tex_src_ms_index;
+      instr->src[src_number].src = evaluate_rvalue(ir->lod_info.sample_index);
+      instr->src[src_number].src_type = nir_tex_src_ms_index;
       src_number++;
       break;
 
@@ -1712,8 +1831,8 @@ nir_visitor::visit(ir_constant *ir)
 {
    /*
     * We don't know if this variable is an an array or struct that gets
-    * dereferenced, so do the safe thing an make it a variable and return a
-    * dereference.
+    * dereferenced, so do the safe thing an make it a variable with a
+    * constant initializer and return a dereference.
     */
 
    nir_variable *var = ralloc(this->shader, nir_variable);
@@ -1721,7 +1840,6 @@ nir_visitor::visit(ir_constant *ir)
    var->type = ir->type;
    var->data.mode = nir_var_local;
    var->data.read_only = true;
-   var->constant_value = constant_copy(ir, var);
    var->constant_initializer = constant_copy(ir, var);
    exec_list_push_tail(&this->impl->locals, &var->node);
 
@@ -1750,7 +1868,7 @@ nir_visitor::visit(ir_dereference_record *ir)
    int field_index = this->deref_tail->type->field_index(ir->field);
    assert(field_index >= 0);
 
-   nir_deref_struct *deref = nir_deref_struct_create(this->shader, field_index);
+   nir_deref_struct *deref = nir_deref_struct_create(this->deref_tail, field_index);
    deref->deref.type = ir->type;
    this->deref_tail->child = &deref->deref;
    this->deref_tail = &deref->deref;
@@ -1774,5 +1892,14 @@ nir_visitor::visit(ir_dereference_array *ir)
    ir->array->accept(this);
 
    this->deref_tail->child = &deref->deref;
+   ralloc_steal(this->deref_tail, deref);
    this->deref_tail = &deref->deref;
 }
+
+void
+nir_visitor::visit(ir_barrier *ir)
+{
+   nir_intrinsic_instr *instr =
+      nir_intrinsic_instr_create(this->shader, nir_intrinsic_barrier);
+   nir_instr_insert_after_cf_list(this->cf_node_list, &instr->instr);
+}