compiler, nir: Add and set barrier metadata

Useful for determining whether certain optimizations are legal for a
compute shader (e.g. optimizing workgroup size in the driver).

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6312>

src/compiler/nir/nir_gather_info.c

@@ -712,6 +712,28 @@ gather_intrinsic_info(nir_intrinsic_instr *instr, nir_shader *shader,
       update_memory_written_for_deref(shader, nir_src_as_deref(instr->src[0]));
       break;
 
+   case nir_intrinsic_control_barrier:
+      shader->info.uses_control_barrier = true;
+      break;
+
+   case nir_intrinsic_scoped_barrier:
+      shader->info.uses_control_barrier |=
+         nir_intrinsic_execution_scope(instr) != NIR_SCOPE_NONE;
+
+      shader->info.uses_memory_barrier |=
+         nir_intrinsic_memory_scope(instr) != NIR_SCOPE_NONE;
+      break;
+
+   case nir_intrinsic_memory_barrier:
+   case nir_intrinsic_group_memory_barrier:
+   case nir_intrinsic_memory_barrier_atomic_counter:
+   case nir_intrinsic_memory_barrier_buffer:
+   case nir_intrinsic_memory_barrier_image:
+   case nir_intrinsic_memory_barrier_shared:
+   case nir_intrinsic_memory_barrier_tcs_patch:
+      shader->info.uses_memory_barrier = true;
+      break;
+
    default:
       break;
    }

src/compiler/shader_info.h

@@ -226,6 +226,10 @@ typedef struct shader_info {
    /* Whether gl_Layer is viewport-relative */
    bool layer_viewport_relative:1;
 
+   /* Whether explicit barriers are used */
+   bool uses_control_barrier : 1;
+   bool uses_memory_barrier : 1;
+
    union {
       struct {
          /* Which inputs are doubles */