1 files changed, 98 insertions, 0 deletions
diff --git a/src/compiler/nir/nir_lower_system_values.c b/src/compiler/nir/nir_lower_system_values.c
new file mode 100644
index 0000000..2bd787d
--- /dev/null
+++ b/src/compiler/nir/nir_lower_system_values.c
@@ -0,0 +1,98 @@
+/*
+ * Copyright © 2014 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ * Authors:
+ *    Connor Abbott (cwabbott0@gmail.com)
+ *
+ */
+
+#include "nir.h"
+#include "nir_builder.h"
+
+struct lower_system_values_state {
+   nir_builder builder;
+   bool progress;
+};
+
+static bool
+convert_block(nir_block *block, void *void_state)
+{
+   struct lower_system_values_state *state = void_state;
+
+   nir_builder *b = &state->builder;
+
+   nir_foreach_instr_safe(block, instr) {
+      if (instr->type != nir_instr_type_intrinsic)
+         continue;
+
+      nir_intrinsic_instr *load_var = nir_instr_as_intrinsic(instr);
+
+      if (load_var->intrinsic != nir_intrinsic_load_var)
+         continue;
+
+      nir_variable *var = load_var->variables[0]->var;
+      if (var->data.mode != nir_var_system_value)
+         continue;
+
+      b->cursor = nir_after_instr(&load_var->instr);
+
+      nir_intrinsic_op sysval_op =
+         nir_intrinsic_from_system_value(var->data.location);
+      nir_ssa_def *sysval = nir_load_system_value(b, sysval_op, 0);
+
+      nir_ssa_def_rewrite_uses(&load_var->dest.ssa, nir_src_for_ssa(sysval));
+      nir_instr_remove(&load_var->instr);
+
+      state->progress = true;
+   }
+
+   return true;
+}
+
+static bool
+convert_impl(nir_function_impl *impl)
+{
+   struct lower_system_values_state state;
+
+   state.progress = false;
+   nir_builder_init(&state.builder, impl);
+
+   nir_foreach_block(impl, convert_block, &state);
+   nir_metadata_preserve(impl, nir_metadata_block_index |
+                               nir_metadata_dominance);
+   return state.progress;
+}
+
+bool
+nir_lower_system_values(nir_shader *shader)
+{
+   bool progress = false;
+
+   nir_foreach_function(shader, function) {
+      if (function->impl)
+         progress = convert_impl(function->impl) || progress;
+   }
+
+   exec_list_make_empty(&shader->system_values);
+
+   return progress;
+}