[Mesa-dev] [PATCH 2/3] nir: Add new barrier functions for compute shaders

[Jordan Justen]

When these functions are called in glsl-ir, we create a corresponding
nir intrinsic function call.

Signed-off-by: Jordan Justen <jordan.l.justen at intel.com>
---
 src/glsl/nir/glsl_to_nir.cpp  | 15 +++++++++++++++
 src/glsl/nir/nir_intrinsics.h | 11 +++++++++++
 2 files changed, 26 insertions(+)

diff --git a/src/glsl/nir/glsl_to_nir.cpp b/src/glsl/nir/glsl_to_nir.cpp
index 57aba5b..facb9fa 100644
--- a/src/glsl/nir/glsl_to_nir.cpp
+++ b/src/glsl/nir/glsl_to_nir.cpp
@@ -719,6 +719,16 @@ nir_visitor::visit(ir_call *ir)
          op = nir_intrinsic_ssbo_atomic_comp_swap;
       } else if (strcmp(ir->callee_name(), "__intrinsic_shader_clock") == 0) {
          op = nir_intrinsic_shader_clock;
+      } else if (strcmp(ir->callee_name(), "__intrinsic_group_memory_barrier") == 0) {
+         op = nir_intrinsic_group_memory_barrier;
+      } else if (strcmp(ir->callee_name(), "__intrinsic_memory_barrier_atomic_counter") == 0) {
+         op = nir_intrinsic_memory_barrier_atomic_counter;
+      } else if (strcmp(ir->callee_name(), "__intrinsic_memory_barrier_buffer") == 0) {
+         op = nir_intrinsic_memory_barrier_buffer;
+      } else if (strcmp(ir->callee_name(), "__intrinsic_memory_barrier_image") == 0) {
+         op = nir_intrinsic_memory_barrier_image;
+      } else if (strcmp(ir->callee_name(), "__intrinsic_memory_barrier_shared") == 0) {
+         op = nir_intrinsic_memory_barrier_shared;
       } else {
          unreachable("not reached");
       }
@@ -821,6 +831,11 @@ nir_visitor::visit(ir_call *ir)
          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:
          nir_instr_insert_after_cf_list(this->cf_node_list, &instr->instr);
          break;
       case nir_intrinsic_shader_clock:
diff --git a/src/glsl/nir/nir_intrinsics.h b/src/glsl/nir/nir_intrinsics.h
index c2b6fe7..36fb286 100644
--- a/src/glsl/nir/nir_intrinsics.h
+++ b/src/glsl/nir/nir_intrinsics.h
@@ -91,6 +91,17 @@ BARRIER(memory_barrier)
  */
 INTRINSIC(shader_clock, 0, ARR(), true, 1, 0, 0, NIR_INTRINSIC_CAN_ELIMINATE)
 
+/*
+ * Memory barrier with semantics analogous to the compute shader
+ * groupMemoryBarrier(), memoryBarrierAtomicCounter(), memoryBarrierBuffer(),
+ * memoryBarrierImage() and memoryBarrierShared() GLSL intrinsics.
+ */
+BARRIER(group_memory_barrier)
+BARRIER(memory_barrier_atomic_counter)
+BARRIER(memory_barrier_buffer)
+BARRIER(memory_barrier_image)
+BARRIER(memory_barrier_shared)
+
 /** A conditional discard, with a single boolean source. */
 INTRINSIC(discard_if, 1, ARR(1), false, 0, 0, 0, 0)
 
-- 
2.6.2