glsl: Add ir node for barrier

v2:
 * Changes suggested by mattst88

[jordan.l.justen@intel.com: Add nir support]
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>

12 files changed, 76 insertions, 0 deletions

diff --git a/src/glsl/ir.h b/src/glsl/ir.h
index fab1cd2..f904555 100644
--- a/src/glsl/ir.h
+++ b/src/glsl/ir.h
@@ -78,6 +78,7 @@ enum ir_node_type {
    ir_type_discard,
    ir_type_emit_vertex,
    ir_type_end_primitive,
+   ir_type_barrier,
    ir_type_max, /**< maximum ir_type enum number, for validation */
    ir_type_unset = ir_type_max
 };
@@ -2396,6 +2397,29 @@ public:
    ir_rvalue *stream;
 };
 
+/**
+ * IR instruction for tessellation control and compute shader barrier.
+ */
+class ir_barrier : public ir_instruction {
+public:
+   ir_barrier()
+      : ir_instruction(ir_type_barrier)
+   {
+   }
+
+   virtual void accept(ir_visitor *v)
+   {
+      v->visit(this);
+   }
+
+   virtual ir_barrier *clone(void *mem_ctx, struct hash_table *) const
+   {
+      return new(mem_ctx) ir_barrier();
+   }
+
+   virtual ir_visitor_status accept(ir_hierarchical_visitor *);
+};
+
 /*@}*/
 
 /**
diff --git a/src/glsl/ir_hierarchical_visitor.cpp b/src/glsl/ir_hierarchical_visitor.cpp
index adb6294..1d23a77 100644
--- a/src/glsl/ir_hierarchical_visitor.cpp
+++ b/src/glsl/ir_hierarchical_visitor.cpp
@@ -80,6 +80,15 @@ ir_hierarchical_visitor::visit(ir_dereference_variable *ir)
 }
 
 ir_visitor_status
+ir_hierarchical_visitor::visit(ir_barrier *ir)
+{
+   if (this->callback_enter != NULL)
+      this->callback_enter(ir, this->data_enter);
+
+   return visit_continue;
+}
+
+ir_visitor_status
 ir_hierarchical_visitor::visit_enter(ir_loop *ir)
 {
    if (this->callback_enter != NULL)
diff --git a/src/glsl/ir_hierarchical_visitor.h b/src/glsl/ir_hierarchical_visitor.h
index cac7869..28517b6 100644
--- a/src/glsl/ir_hierarchical_visitor.h
+++ b/src/glsl/ir_hierarchical_visitor.h
@@ -87,6 +87,7 @@ public:
    virtual ir_visitor_status visit(class ir_variable *);
    virtual ir_visitor_status visit(class ir_constant *);
    virtual ir_visitor_status visit(class ir_loop_jump *);
+   virtual ir_visitor_status visit(class ir_barrier *);
 
    /**
     * ir_dereference_variable isn't technically a leaf, but it is treated as a
diff --git a/src/glsl/ir_hv_accept.cpp b/src/glsl/ir_hv_accept.cpp
index be5b3ea..d3662cf 100644
--- a/src/glsl/ir_hv_accept.cpp
+++ b/src/glsl/ir_hv_accept.cpp
@@ -429,3 +429,9 @@ ir_end_primitive::accept(ir_hierarchical_visitor *v)
 
    return (s == visit_stop) ? s : v->visit_leave(this);
 }
+
+ir_visitor_status
+ir_barrier::accept(ir_hierarchical_visitor *v)
+{
+   return v->visit(this);
+}
diff --git a/src/glsl/ir_print_visitor.cpp b/src/glsl/ir_print_visitor.cpp
index 01f52e8..f5de6ac 100644
--- a/src/glsl/ir_print_visitor.cpp
+++ b/src/glsl/ir_print_visitor.cpp
@@ -573,5 +573,10 @@ ir_print_visitor::visit(ir_end_primitive *ir)
    fprintf(f, "(end-primitive ");
    ir->stream->accept(this);
    fprintf(f, ")\n");
+}
 
+void
+ir_print_visitor::visit(ir_barrier *ir)
+{
+   fprintf(f, "(barrier)\n");
 }
diff --git a/src/glsl/ir_print_visitor.h b/src/glsl/ir_print_visitor.h
index 98f041d..965e63a 100644
--- a/src/glsl/ir_print_visitor.h
+++ b/src/glsl/ir_print_visitor.h
@@ -71,6 +71,7 @@ public:
    virtual void visit(ir_loop_jump *);
    virtual void visit(ir_emit_vertex *);
    virtual void visit(ir_end_primitive *);
+   virtual void visit(ir_barrier *);
    /*@}*/
 
 private:
diff --git a/src/glsl/ir_visitor.h b/src/glsl/ir_visitor.h
index 40f96ff..7c38481 100644
--- a/src/glsl/ir_visitor.h
+++ b/src/glsl/ir_visitor.h
@@ -65,6 +65,7 @@ public:
    virtual void visit(class ir_loop_jump *) = 0;
    virtual void visit(class ir_emit_vertex *) = 0;
    virtual void visit(class ir_end_primitive *) = 0;
+   virtual void visit(class ir_barrier *) = 0;
    /*@}*/
 };
 
@@ -85,6 +86,7 @@ public:
    virtual void visit(class ir_call *) {}
    virtual void visit(class ir_emit_vertex *) {}
    virtual void visit(class ir_end_primitive *) {}
+   virtual void visit(class ir_barrier *) {}
 };
 #endif /* __cplusplus */
 
diff --git a/src/glsl/nir/glsl_to_nir.cpp b/src/glsl/nir/glsl_to_nir.cpp
index ad8cfad..3c7284e 100644
--- a/src/glsl/nir/glsl_to_nir.cpp
+++ b/src/glsl/nir/glsl_to_nir.cpp
@@ -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);
 
@@ -1889,3 +1890,9 @@ nir_visitor::visit(ir_dereference_array *ir)
    ralloc_steal(this->deref_tail, deref);
    this->deref_tail = &deref->deref;
 }
+
+void
+nir_visitor::visit(ir_barrier *ir)
+{
+   unreachable("Not implemented!");
+}
diff --git a/src/mesa/drivers/dri/i965/brw_vec4.h b/src/mesa/drivers/dri/i965/brw_vec4.h
index 06a16a4..4449e0a 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4.h
+++ b/src/mesa/drivers/dri/i965/brw_vec4.h
@@ -160,6 +160,7 @@ public:
    virtual void visit(ir_if *);
    virtual void visit(ir_emit_vertex *);
    virtual void visit(ir_end_primitive *);
+   virtual void visit(ir_barrier *);
    /*@}*/
 
    src_reg result;
diff --git a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
index 242d007..0a76bde 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
@@ -2967,6 +2967,12 @@ vec4_visitor::visit(ir_end_primitive *)
 }
 
 void
+vec4_visitor::visit(ir_barrier *)
+{
+   unreachable("not reached");
+}
+
+void
 vec4_visitor::emit_untyped_atomic(unsigned atomic_op, unsigned surf_index,
                                   dst_reg dst, src_reg offset,
                                   src_reg src0, src_reg src1)
diff --git a/src/mesa/program/ir_to_mesa.cpp b/src/mesa/program/ir_to_mesa.cpp
index 514bb93..18e3bc5 100644
--- a/src/mesa/program/ir_to_mesa.cpp
+++ b/src/mesa/program/ir_to_mesa.cpp
@@ -262,6 +262,7 @@ public:
    virtual void visit(ir_if *);
    virtual void visit(ir_emit_vertex *);
    virtual void visit(ir_end_primitive *);
+   virtual void visit(ir_barrier *);
    /*@}*/
 
    src_reg result;
@@ -2117,6 +2118,12 @@ ir_to_mesa_visitor::visit(ir_end_primitive *)
    assert(!"Geometry shaders not supported.");
 }
 
+void
+ir_to_mesa_visitor::visit(ir_barrier *)
+{
+   unreachable("GLSL barrier() not supported.");
+}
+
 ir_to_mesa_visitor::ir_to_mesa_visitor()
 {
    result.file = PROGRAM_UNDEFINED;
diff --git a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
index 0e60d95..03834b6 100644
--- a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
+++ b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
@@ -395,6 +395,7 @@ public:
    virtual void visit(ir_if *);
    virtual void visit(ir_emit_vertex *);
    virtual void visit(ir_end_primitive *);
+   virtual void visit(ir_barrier *);
    /*@}*/
 
    st_src_reg result;
@@ -3417,6 +3418,12 @@ glsl_to_tgsi_visitor::visit(ir_end_primitive *ir)
    emit_asm(ir, TGSI_OPCODE_ENDPRIM, undef_dst, this->result);
 }
 
+void
+glsl_to_tgsi_visitor::visit(ir_barrier *ir)
+{
+   unreachable("Not implemented!");
+}
+
 glsl_to_tgsi_visitor::glsl_to_tgsi_visitor()
 {
    result.file = PROGRAM_UNDEFINED;