r300/compiler: Add a new function for more efficient dataflow analysis

rc_get_readers_normal() supplies a list of readers for a given
instruction.  This function is now being used by the copy propagate
optimization and will eventually be used by most other optimization
passes as well.

1 files changed, 61 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/r300/compiler/radeon_compiler_util.c b/src/mesa/drivers/dri/r300/compiler/radeon_compiler_util.c
new file mode 100644
index 0000000000..97f4c75849
--- /dev/null
+++ b/src/mesa/drivers/dri/r300/compiler/radeon_compiler_util.c
@@ -0,0 +1,61 @@
+/*
+ * Copyright 2010 Tom Stellard <tstellar@gmail.com>
+ *
+ * All Rights Reserved.
+ *
+ * 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 COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS 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
+ */
+
+#include "radeon_compiler_util.h"
+
+/**
+ */
+unsigned int rc_swizzle_to_writemask(unsigned int swz)
+{
+	unsigned int mask = 0;
+	unsigned int i;
+
+	for(i = 0; i < 4; i++) {
+		mask |= 1 << GET_SWZ(swz, i);
+	}
+	mask &= RC_MASK_XYZW;
+
+	return mask;
+}
+
+unsigned int rc_src_reads_dst_mask(
+		rc_register_file src_file,
+		unsigned int src_idx,
+		unsigned int src_swz,
+		rc_register_file dst_file,
+		unsigned int dst_idx,
+		unsigned int dst_mask)
+{
+	if (src_file != dst_file || src_idx != dst_idx) {
+		return RC_MASK_NONE;
+	}
+	return dst_mask & rc_swizzle_to_writemask(src_swz);
+}