After we lower variables, we want to delete them in order to free up
some memory.
Signed-off-by: Connor Abbott <connor.abb...@intel.com>
---
src/glsl/Makefile.sources | 1 +
src/glsl/nir/nir.h | 2 +
src/glsl/nir/nir_remove_dead_variables.c | 138 +++++++++++++++++++++++++++++++
3 files changed, 141 insertions(+)
create mode 100644 src/glsl/nir/nir_remove_dead_variables.c
diff --git a/src/glsl/Makefile.sources b/src/glsl/Makefile.sources
index d0c750c..0b7c585 100644
--- a/src/glsl/Makefile.sources
+++ b/src/glsl/Makefile.sources
@@ -19,6 +19,7 @@ NIR_FILES = \
$(GLSL_SRCDIR)/nir/nir_lower_variables_scalar.c \
$(GLSL_SRCDIR)/nir/nir_opcodes.c \
$(GLSL_SRCDIR)/nir/nir_print.c \
+ $(GLSL_SRCDIR)/nir/nir_remove_dead_variables.c \
$(GLSL_SRCDIR)/nir/nir_validate.c \
$(GLSL_SRCDIR)/nir/nir_types.cpp \
$(GLSL_SRCDIR)/nir/glsl_to_nir.cpp
diff --git a/src/glsl/nir/nir.h b/src/glsl/nir/nir.h
index ba85975..e113e50 100644
--- a/src/glsl/nir/nir.h
+++ b/src/glsl/nir/nir.h
@@ -1252,6 +1252,8 @@ void nir_lower_variables_scalar(nir_shader *shader, bool
lower_globals,
bool lower_io, bool add_names,
bool native_integers);
+void nir_remove_dead_variables(nir_shader *shader);
+
#ifdef __cplusplus
} /* extern "C" */
#endif
diff --git a/src/glsl/nir/nir_remove_dead_variables.c
b/src/glsl/nir/nir_remove_dead_variables.c
new file mode 100644
index 0000000..4379f99
--- /dev/null
+++ b/src/glsl/nir/nir_remove_dead_variables.c
@@ -0,0 +1,138 @@
+/*
+ * 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 (cwabbo...@gmail.com)
+ *
+ */
+
+#include "nir.h"
+
+static void
+add_var_use_intrinsic(nir_intrinsic_instr *instr, struct set *live)
+{
+ unsigned num_vars = nir_intrinsic_infos[instr->intrinsic].num_variables;
+ for (unsigned i = 0; i < num_vars; i++) {
+ nir_variable *var = instr->variables[i]->var;
+ _mesa_set_add(live, _mesa_hash_pointer(var), var);
+ }
+}
+
+static void
+add_var_use_call(nir_call_instr *instr, struct set *live)
+{
+ if (instr->return_deref != NULL) {
+ nir_variable *var = instr->return_deref->var;
+ _mesa_set_add(live, _mesa_hash_pointer(var), var);
+ }
+
+ for (unsigned i = 0; i < instr->num_params; i++) {
+ nir_variable *var = instr->params[i]->var;
+ _mesa_set_add(live, _mesa_hash_pointer(var), var);
+ }
+}
+
+static void
+add_var_use_tex(nir_tex_instr *instr, struct set *live)
+{
+ if (instr->sampler != NULL) {
+ nir_variable *var = instr->sampler->var;
+ _mesa_set_add(live, _mesa_hash_pointer(var), var);
+ }
+}
+
+static bool
+add_var_use_block(nir_block *block, void *state)
+{
+ struct set *live = (struct set *) state;
+
+ nir_foreach_instr(block, instr) {
+ switch(instr->type) {
+ case nir_instr_type_intrinsic:
+ add_var_use_intrinsic(nir_instr_as_intrinsic(instr), live);
+ break;
+
+ case nir_instr_type_call:
+ add_var_use_call(nir_instr_as_call(instr), live);
+ break;
+
+ case nir_instr_type_texture:
+ add_var_use_tex(nir_instr_as_texture(instr), live);
+ break;
+
+ default:
+ break;
+ }
+ }
+
+ return true;
+}
+
+static void
+add_var_use_shader(nir_shader *shader, struct set *live)
+{
+ nir_foreach_overload(shader, overload) {
+ if (overload->impl) {
+ nir_foreach_block(overload->impl, add_var_use_block, live);
+ }
+ }
+}
+
+static void
+remove_dead_local_vars(nir_function_impl *impl, struct set *live)
+{
+ foreach_list_typed_safe(nir_variable, var, node, &impl->locals) {
+ struct set_entry *entry =
+ _mesa_set_search(live, _mesa_hash_pointer(var), var);
+ if (entry == NULL)
+ exec_node_remove(&var->node);
+ }
+}
+
+static void
+remove_dead_global_vars(nir_shader *shader, struct set *live)
+{
+ foreach_list_typed_safe(nir_variable, var, node, &shader->globals) {
+ struct set_entry *entry =
+ _mesa_set_search(live, _mesa_hash_pointer(var), var);
+ if (entry == NULL)
+ exec_node_remove(&var->node);
+ }
+}
+
+void
+nir_remove_dead_variables(nir_shader *shader)
+{
+ struct set *live =
+ _mesa_set_create(NULL, _mesa_key_pointer_equal);
+
+ add_var_use_shader(shader, live);
+
+ remove_dead_global_vars(shader, live);
+
+ nir_foreach_overload(shader, overload) {
+ if (overload->impl)
+ remove_dead_local_vars(overload->impl, live);
+ }
+
+ _mesa_set_destroy(live, NULL);
+}
--
1.9.3
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