i965/nir: Use nir_system_value_from_intrinsic to reduce duplication.

This code is all pretty much identical.  We just needed the translation
from one enum value to the other.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>

2 files changed, 17 insertions, 60 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_fs_nir.cpp b/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
index 9929dd6a42..a6c6a2fa8d 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
@@ -1444,35 +1444,16 @@ fs_visitor::nir_emit_intrinsic(const fs_builder &bld, nir_intrinsic_instr *instr
    case nir_intrinsic_load_vertex_id:
       unreachable("should be lowered by lower_vertex_id()");
 
-   case nir_intrinsic_load_vertex_id_zero_base: {
-      fs_reg vertex_id = nir_system_values[SYSTEM_VALUE_VERTEX_ID_ZERO_BASE];
-      assert(vertex_id.file != BAD_FILE);
-      dest.type = vertex_id.type;
-      bld.MOV(dest, vertex_id);
-      break;
-   }
-
-   case nir_intrinsic_load_base_vertex: {
-      fs_reg base_vertex = nir_system_values[SYSTEM_VALUE_BASE_VERTEX];
-      assert(base_vertex.file != BAD_FILE);
-      dest.type = base_vertex.type;
-      bld.MOV(dest, base_vertex);
-      break;
-   }
-
-   case nir_intrinsic_load_instance_id: {
-      fs_reg instance_id = nir_system_values[SYSTEM_VALUE_INSTANCE_ID];
-      assert(instance_id.file != BAD_FILE);
-      dest.type = instance_id.type;
-      bld.MOV(dest, instance_id);
-      break;
-   }
-
-   case nir_intrinsic_load_sample_mask_in: {
-      fs_reg sample_mask_in = nir_system_values[SYSTEM_VALUE_SAMPLE_MASK_IN];
-      assert(sample_mask_in.file != BAD_FILE);
-      dest.type = sample_mask_in.type;
-      bld.MOV(dest, sample_mask_in);
+   case nir_intrinsic_load_vertex_id_zero_base:
+   case nir_intrinsic_load_base_vertex:
+   case nir_intrinsic_load_instance_id:
+   case nir_intrinsic_load_sample_mask_in:
+   case nir_intrinsic_load_sample_id: {
+      gl_system_value sv = nir_system_value_from_intrinsic(instr->intrinsic);
+      fs_reg val = nir_system_values[sv];
+      assert(val.file != BAD_FILE);
+      dest.type = val.type;
+      bld.MOV(dest, val);
       break;
    }
 
@@ -1485,14 +1466,6 @@ fs_visitor::nir_emit_intrinsic(const fs_builder &bld, nir_intrinsic_instr *instr
       break;
    }
 
-   case nir_intrinsic_load_sample_id: {
-      fs_reg sample_id = nir_system_values[SYSTEM_VALUE_SAMPLE_ID];
-      assert(sample_id.file != BAD_FILE);
-      dest.type = sample_id.type;
-      bld.MOV(dest, sample_id);
-      break;
-   }
-
    case nir_intrinsic_load_uniform_indirect:
       has_indirect = true;
       /* fallthrough */
diff --git a/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp b/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp
index f3dc112394..751ec73f70 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp
@@ -533,30 +533,14 @@ vec4_visitor::nir_emit_intrinsic(nir_intrinsic_instr *instr)
    case nir_intrinsic_load_vertex_id:
       unreachable("should be lowered by lower_vertex_id()");
 
-   case nir_intrinsic_load_vertex_id_zero_base: {
-      src_reg vertex_id =
-         src_reg(nir_system_values[SYSTEM_VALUE_VERTEX_ID_ZERO_BASE]);
-      assert(vertex_id.file != BAD_FILE);
-      dest = get_nir_dest(instr->dest, vertex_id.type);
-      emit(MOV(dest, vertex_id));
-      break;
-   }
-
-   case nir_intrinsic_load_base_vertex: {
-      src_reg base_vertex =
-         src_reg(nir_system_values[SYSTEM_VALUE_BASE_VERTEX]);
-      assert(base_vertex.file != BAD_FILE);
-      dest = get_nir_dest(instr->dest, base_vertex.type);
-      emit(MOV(dest, base_vertex));
-      break;
-   }
-
+   case nir_intrinsic_load_vertex_id_zero_base:
+   case nir_intrinsic_load_base_vertex:
    case nir_intrinsic_load_instance_id: {
-      src_reg instance_id =
-         src_reg(nir_system_values[SYSTEM_VALUE_INSTANCE_ID]);
-      assert(instance_id.file != BAD_FILE);
-      dest = get_nir_dest(instr->dest, instance_id.type);
-      emit(MOV(dest, instance_id));
+      gl_system_value sv = nir_system_value_from_intrinsic(instr->intrinsic);
+      src_reg val = src_reg(nir_system_values[sv]);
+      assert(val.file != BAD_FILE);
+      dest = get_nir_dest(instr->dest, val.type);
+      emit(MOV(dest, val));
       break;
    }