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| author | marha <marha@users.sourceforge.net> | 2010-12-28 16:10:20 +0000 |
|---|---|---|
| committer | marha <marha@users.sourceforge.net> | 2010-12-28 16:10:20 +0000 |
| commit | 807c6931fe683fd844ceec1b023232181e6aae03 (patch) | |
| tree | 1a131ed95fe2200d0ad33da8f7755a7ed2364adc /mesalib/src/glsl/opt_noop_swizzle.cpp | |
| parent | 973099dda7e49e5abe29819a7124b3b1e7bd8b92 (diff) | |
| download | vcxsrv-807c6931fe683fd844ceec1b023232181e6aae03.tar.gz vcxsrv-807c6931fe683fd844ceec1b023232181e6aae03.tar.bz2 vcxsrv-807c6931fe683fd844ceec1b023232181e6aae03.zip | |
xserver and mesa git update 28-12-2010
Diffstat (limited to 'mesalib/src/glsl/opt_noop_swizzle.cpp')
| -rw-r--r-- | mesalib/src/glsl/opt_noop_swizzle.cpp | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/mesalib/src/glsl/opt_noop_swizzle.cpp b/mesalib/src/glsl/opt_noop_swizzle.cpp new file mode 100644 index 000000000..c034d7339 --- /dev/null +++ b/mesalib/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 opt_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;
+}
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