1 files changed, 107 insertions, 0 deletions
diff --git a/src/compiler/nir/nir_strip.c b/src/compiler/nir/nir_strip.c
new file mode 100644
index 00000000000..b2c6f16af96
--- /dev/null
+++ b/src/compiler/nir/nir_strip.c
@@ -0,0 +1,107 @@
+/*
+ * Copyright © 2019 Valve 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.
+ *
+ */
+
+#include "nir.h"
+#include "util/debug.h"
+
+/* This pass removes information which is only useful for debugging,
+ * making cache hits from similar shaders more likely.
+ */
+
+static void
+strip_variable(nir_variable *var)
+{
+   var->name = NULL;
+
+   if (var->data.mode != nir_var_shader_in &&
+       var->data.mode != nir_var_shader_out) {
+      /* We assume that this is called after nir_lower_io(), at which point
+       * the original user-facing location is irrelevant except for inputs and
+       * outputs.
+       */
+      var->data.location = 0;
+   }
+}
+
+static void
+strip_register(nir_register *reg)
+{
+   reg->name = NULL;
+}
+
+static bool
+strip_def(nir_ssa_def *def, void *_unused)
+{
+   (void) _unused;
+   def->name = NULL;
+   return true;
+}
+
+static void
+strip_impl(nir_function_impl *impl)
+{
+   nir_index_ssa_defs(impl);
+
+   nir_foreach_variable(var, &impl->locals)
+      strip_variable(var);
+   nir_foreach_register(reg, &impl->registers)
+      strip_register(reg);
+   nir_foreach_block(block, impl) {
+      nir_foreach_instr(instr, block) {
+         nir_foreach_ssa_def(instr, strip_def, NULL);
+      }
+   }
+}
+
+void
+nir_strip(nir_shader *shader)
+{
+   static int should_strip = -1;
+   if (should_strip < 0)
+      should_strip = env_var_as_boolean("NIR_STRIP", true);
+   if (!should_strip)
+      return;
+
+   shader->info.name = NULL;
+   shader->info.label = NULL;
+
+   nir_foreach_variable(var, &shader->uniforms)
+      strip_variable(var);
+   nir_foreach_variable(var, &shader->inputs)
+      strip_variable(var);
+   nir_foreach_variable(var, &shader->outputs)
+      strip_variable(var);
+   nir_foreach_variable(var, &shader->system_values)
+      strip_variable(var);
+   nir_foreach_variable(var, &shader->globals)
+      strip_variable(var);
+
+   nir_foreach_register(reg, &shader->registers)
+      strip_register(reg);
+
+   nir_foreach_function(func, shader) {
+      if (func->impl)
+         strip_impl(func->impl);
+   }
+}