i965/vec4: Redefine make_reg_for_system_value() to allow reuse in NIR->vec4 pass

The new virtual method is more flexible, it has a signature:

dst_reg *make_reg_for_system_value(int location, const glsl_type *type);

v2 (Jason Ekstrand):
   Use the new version in unit tests so make check passes again

Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>

src/mesa/drivers/dri/i965/brw_vec4.h

@@ -410,6 +410,9 @@ public:
    virtual void nir_emit_jump(nir_jump_instr *instr);
    virtual void nir_emit_texture(nir_tex_instr *instr);
 
+   virtual dst_reg *make_reg_for_system_value(int location,
+                                              const glsl_type *type) = 0;
+
    src_reg *nir_inputs;
    unsigned *nir_uniform_driver_location;
 
@@ -419,7 +422,6 @@ protected:
                                     bool interleaved);
    void setup_payload_interference(struct ra_graph *g, int first_payload_node,
                                    int reg_node_count);
-   virtual dst_reg *make_reg_for_system_value(ir_variable *ir) = 0;
    virtual void assign_binding_table_offsets();
    virtual void setup_payload() = 0;
    virtual void emit_prolog() = 0;

src/mesa/drivers/dri/i965/brw_vec4_gs_visitor.cpp

@@ -51,11 +51,12 @@ vec4_gs_visitor::vec4_gs_visitor(const struct brw_compiler *compiler,
 
 
 dst_reg *
-vec4_gs_visitor::make_reg_for_system_value(ir_variable *ir)
+vec4_gs_visitor::make_reg_for_system_value(int location,
+                                           const glsl_type *type)
 {
-   dst_reg *reg = new(mem_ctx) dst_reg(this, ir->type);
+   dst_reg *reg = new(mem_ctx) dst_reg(this, type);
 
-   switch (ir->data.location) {
+   switch (location) {
    case SYSTEM_VALUE_INVOCATION_ID:
       this->current_annotation = "initialize gl_InvocationID";
       emit(GS_OPCODE_GET_INSTANCE_ID, *reg);

src/mesa/drivers/dri/i965/brw_vec4_gs_visitor.h

@@ -76,7 +76,8 @@ public:
                    int shader_time_index);
 
 protected:
-   virtual dst_reg *make_reg_for_system_value(ir_variable *ir);
+   virtual dst_reg *make_reg_for_system_value(int location,
+                                              const glsl_type *type);
    virtual void setup_payload();
    virtual void emit_prolog();
    virtual void emit_program_code();

src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp

@@ -1094,7 +1094,7 @@ vec4_visitor::visit(ir_variable *ir)
       break;
 
    case ir_var_system_value:
-      reg = make_reg_for_system_value(ir);
+      reg = make_reg_for_system_value(ir->data.location, ir->type);
       break;
 
    default:

src/mesa/drivers/dri/i965/brw_vec4_vs_visitor.cpp

@@ -143,7 +143,8 @@ vec4_vs_visitor::emit_prolog()
 
 
 dst_reg *
-vec4_vs_visitor::make_reg_for_system_value(ir_variable *ir)
+vec4_vs_visitor::make_reg_for_system_value(int location,
+                                           const glsl_type *type)
 {
    /* VertexID is stored by the VF as the last vertex element, but
     * we don't represent it with a flag in inputs_read, so we call
@@ -151,7 +152,7 @@ vec4_vs_visitor::make_reg_for_system_value(ir_variable *ir)
     */
    dst_reg *reg = new(mem_ctx) dst_reg(ATTR, VERT_ATTRIB_MAX);
 
-   switch (ir->data.location) {
+   switch (location) {
    case SYSTEM_VALUE_BASE_VERTEX:
       reg->writemask = WRITEMASK_X;
       vs_prog_data->uses_vertexid = true;

src/mesa/drivers/dri/i965/brw_vs.h

@@ -95,7 +95,8 @@ public:
                    bool use_legacy_snorm_formula);
 
 protected:
-   virtual dst_reg *make_reg_for_system_value(ir_variable *ir);
+   virtual dst_reg *make_reg_for_system_value(int location,
+                                              const glsl_type *type);
    virtual void setup_payload();
    virtual void emit_prolog();
    virtual void emit_program_code();

src/mesa/drivers/dri/i965/test_vec4_copy_propagation.cpp

@@ -53,7 +53,8 @@ public:
    }
 
 protected:
-   virtual dst_reg *make_reg_for_system_value(ir_variable *ir)
+   virtual dst_reg *make_reg_for_system_value(int location,
+                                              const glsl_type *type)
    {
       unreachable("Not reached");
    }

src/mesa/drivers/dri/i965/test_vec4_register_coalesce.cpp

@@ -56,7 +56,8 @@ public:
    }
 
 protected:
-   virtual dst_reg *make_reg_for_system_value(ir_variable *ir)
+   virtual dst_reg *make_reg_for_system_value(int location,
+                                              const glsl_type *type)
    {
       unreachable("Not reached");
    }