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authorKenneth Graunke <[email protected]>2010-11-15 14:35:46 -0800
committerKenneth Graunke <[email protected]>2010-11-15 16:34:20 -0800
commit32aaf89823de11e98cb59d5ec78c66cd3e74bcd4 (patch)
treec8ea892f0fea779e4e82e57b644b3b2ca5d389ea /src/glsl/opt_noop_swizzle.cpp
parent46b80d6469815aa7e9956018a112ef8a19dc44c3 (diff)
glsl: Rename various ir_* files to lower_* and opt_*.
This helps distinguish between lowering passes, optimization passes, and other compiler code.
Diffstat (limited to 'src/glsl/opt_noop_swizzle.cpp')
-rw-r--r--src/glsl/opt_noop_swizzle.cpp80
1 files changed, 80 insertions, 0 deletions
diff --git a/src/glsl/opt_noop_swizzle.cpp b/src/glsl/opt_noop_swizzle.cpp
new file mode 100644
index 00000000000..0403dfa4e93
--- /dev/null
+++ b/src/glsl/opt_noop_swizzle.cpp
@@ -0,0 +1,80 @@
+/*
+ * Copyright © 2010 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.
+ */
+
+/**
+ * \file ir_noop_swizzle.cpp
+ *
+ * If a swizzle doesn't change the order or count of components, then
+ * remove the swizzle so that other optimization passes see the value
+ * behind it.
+ */
+
+#include "ir.h"
+#include "ir_visitor.h"
+#include "ir_rvalue_visitor.h"
+#include "ir_print_visitor.h"
+#include "glsl_types.h"
+
+class ir_noop_swizzle_visitor : public ir_rvalue_visitor {
+public:
+ ir_noop_swizzle_visitor()
+ {
+ this->progress = false;
+ }
+
+ void handle_rvalue(ir_rvalue **rvalue);
+ bool progress;
+};
+
+void
+ir_noop_swizzle_visitor::handle_rvalue(ir_rvalue **rvalue)
+{
+ if (!*rvalue)
+ return;
+
+ ir_swizzle *swiz = (*rvalue)->as_swizzle();
+ if (!swiz || swiz->type != swiz->val->type)
+ return;
+
+ int elems = swiz->val->type->vector_elements;
+ if (swiz->mask.x != 0)
+ return;
+ if (elems >= 2 && swiz->mask.y != 1)
+ return;
+ if (elems >= 3 && swiz->mask.z != 2)
+ return;
+ if (elems >= 4 && swiz->mask.w != 3)
+ return;
+
+ this->progress = true;
+ *rvalue = swiz->val;
+}
+
+bool
+do_noop_swizzle(exec_list *instructions)
+{
+ ir_noop_swizzle_visitor v;
+ visit_list_elements(&v, instructions);
+
+ return v.progress;
+}