nir: Rename nir_intrinsic_barrier to control_barrier

This is a more explicit name now that we don't want it to be doing any
memory barrier stuff for us.

Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3307>

src/compiler/nir/nir_intrinsics.py

@@ -195,7 +195,6 @@ intrinsic("get_buffer_size", src_comp=[-1], dest_comp=1,
 def barrier(name):
     intrinsic(name)
 
-barrier("barrier")
 barrier("discard")
 
 # Demote fragment shader invocation to a helper invocation.  Any stores to
@@ -207,6 +206,12 @@ barrier("discard")
 barrier("demote")
 intrinsic("is_helper_invocation", dest_comp=1, flags=[CAN_ELIMINATE])
 
+# A workgroup-level control barrier.  Any thread which hits this barrier will
+# pause until all threads within the current workgroup have also hit the
+# barrier.  For compute shaders, the workgroup is defined as the local group.
+# For tessellation control shaders, the workgroup is defined as the current
+# patch.  This intrinsic does not imply any sort of memory barrier.
+barrier("control_barrier")
 
 # Memory barrier with semantics analogous to the memoryBarrier() GLSL
 # intrinsic.

src/compiler/nir/nir_opt_combine_stores.c

@@ -303,7 +303,7 @@ combine_stores_block(struct combine_stores_state *state, nir_block *block)
          update_combined_store(state, intrin);
          break;
 
-      case nir_intrinsic_barrier:
+      case nir_intrinsic_control_barrier:
       case nir_intrinsic_group_memory_barrier:
       case nir_intrinsic_memory_barrier:
          combine_stores_with_modes(state, nir_var_shader_out |

src/compiler/nir/nir_opt_copy_prop_vars.c

@@ -164,7 +164,7 @@ gather_vars_written(struct copy_prop_var_state *state,
 
          nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
          switch (intrin->intrinsic) {
-         case nir_intrinsic_barrier:
+         case nir_intrinsic_control_barrier:
          case nir_intrinsic_memory_barrier:
             written->modes |= nir_var_shader_out |
                               nir_var_mem_ssbo |
@@ -798,7 +798,7 @@ copy_prop_vars_block(struct copy_prop_var_state *state,
 
       nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
       switch (intrin->intrinsic) {
-      case nir_intrinsic_barrier:
+      case nir_intrinsic_control_barrier:
       case nir_intrinsic_memory_barrier:
          if (debug) dump_instr(instr);
 

src/compiler/nir/nir_opt_dead_write_vars.c

@@ -131,7 +131,7 @@ remove_dead_write_vars_local(void *mem_ctx, nir_block *block)
 
       nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
       switch (intrin->intrinsic) {
-      case nir_intrinsic_barrier:
+      case nir_intrinsic_control_barrier:
       case nir_intrinsic_memory_barrier: {
          clear_unused_for_modes(&unused_writes, nir_var_shader_out |
                                                 nir_var_mem_ssbo |

src/compiler/nir/nir_schedule.c

@@ -347,7 +347,7 @@ nir_schedule_intrinsic_deps(nir_deps_state *state,
       add_write_dep(state, &state->store_shared, n);
       break;
 
-   case nir_intrinsic_barrier:
+   case nir_intrinsic_control_barrier:
    case nir_intrinsic_memory_barrier_shared:
       add_write_dep(state, &state->store_shared, n);
 

src/compiler/nir/tests/load_store_vectorizer_tests.cpp

@@ -773,12 +773,13 @@ TEST_F(nir_load_store_vectorize_test, ssbo_load_adjacent_memory_barrier)
    ASSERT_EQ(count_intrinsics(nir_intrinsic_load_ssbo), 2);
 }
 
-/* nir_intrinsic_barrier only syncs invocations in a workgroup, it doesn't
- * require that loads/stores complete. */
+/* nir_intrinsic_control_barrier only syncs invocations in a workgroup, it
+ * doesn't require that loads/stores complete.
+ */
 TEST_F(nir_load_store_vectorize_test, ssbo_load_adjacent_barrier)
 {
    create_load(nir_var_mem_ssbo, 0, 0, 0x1);
-   nir_builder_instr_insert(b, &nir_intrinsic_instr_create(b->shader, nir_intrinsic_barrier)->instr);
+   nir_builder_instr_insert(b, &nir_intrinsic_instr_create(b->shader, nir_intrinsic_control_barrier)->instr);
    create_load(nir_var_mem_ssbo, 0, 4, 0x2);
 
    nir_validate_shader(b->shader, NULL);