[Mesa-dev] [PATCH v3 26/44] nir: Translate glsl shared var load intrinsic to nir intrinsic

[Jordan Justen]

Signed-off-by: Jordan Justen <jordan.l.justen at intel.com>
Reviewed-by: Iago Toral Quiroga <itoral at igalia.com>
---
 src/glsl/nir/glsl_to_nir.cpp  | 29 +++++++++++++++++++++++++++++
 src/glsl/nir/nir_intrinsics.h |  1 +
 2 files changed, 30 insertions(+)

diff --git a/src/glsl/nir/glsl_to_nir.cpp b/src/glsl/nir/glsl_to_nir.cpp
index 45d045c..38f9804 100644
--- a/src/glsl/nir/glsl_to_nir.cpp
+++ b/src/glsl/nir/glsl_to_nir.cpp
@@ -727,6 +727,8 @@ nir_visitor::visit(ir_call *ir)
          op = nir_intrinsic_memory_barrier_image;
       } else if (strcmp(ir->callee_name(), "__intrinsic_memory_barrier_shared") == 0) {
          op = nir_intrinsic_memory_barrier_shared;
+      } else if (strcmp(ir->callee_name(), "__intrinsic_load_shared") == 0) {
+         op = nir_intrinsic_load_shared;
       } else {
          unreachable("not reached");
       }
@@ -974,6 +976,33 @@ nir_visitor::visit(ir_call *ir)
          nir_builder_instr_insert(&b, &instr->instr);
          break;
       }
+      case nir_intrinsic_load_shared: {
+         exec_node *param = ir->actual_parameters.get_head();
+         ir_rvalue *offset = ((ir_instruction *)param)->as_rvalue();
+
+         /* Check if we need the indirect version */
+         ir_constant *const_offset = offset->as_constant();
+         if (!const_offset) {
+            op = nir_intrinsic_load_shared_indirect;
+            ralloc_free(instr);
+            instr = nir_intrinsic_instr_create(shader, op);
+            instr->src[0] = nir_src_for_ssa(evaluate_rvalue(offset));
+            instr->const_index[0] = 0;
+            dest = &instr->dest;
+         } else {
+            instr->const_index[0] = const_offset->value.u[0];
+         }
+
+         const glsl_type *type = ir->return_deref->var->type;
+         instr->num_components = type->vector_elements;
+
+         /* Setup destination register */
+         nir_ssa_dest_init(&instr->instr, &instr->dest,
+                           type->vector_elements, NULL);
+
+         nir_builder_instr_insert(&b, &instr->instr);
+         break;
+      }
       default:
          unreachable("not reached");
       }
diff --git a/src/glsl/nir/nir_intrinsics.h b/src/glsl/nir/nir_intrinsics.h
index b2565c5..011b95d 100644
--- a/src/glsl/nir/nir_intrinsics.h
+++ b/src/glsl/nir/nir_intrinsics.h
@@ -258,6 +258,7 @@ LOAD(per_vertex_input, 1, 1, NIR_INTRINSIC_CAN_ELIMINATE | NIR_INTRINSIC_CAN_REO
 LOAD(ssbo, 1, 1, NIR_INTRINSIC_CAN_ELIMINATE)
 LOAD(output, 0, 1, NIR_INTRINSIC_CAN_ELIMINATE)
 LOAD(per_vertex_output, 1, 1, NIR_INTRINSIC_CAN_ELIMINATE)
+LOAD(shared, 0, 1, NIR_INTRINSIC_CAN_ELIMINATE)
 
 /*
  * Stores work the same way as loads, except now the first register input is
-- 
2.6.2