r300/compiler: New dataflow structures and passes

This replaces the old NQSSADCE code with the same functionality, but quite
different design. Instead of doing a single integerated pass, we now build
explicit data structures representing the dataflow.

This will enable analysis of flow control instruction, and could potentially
open an avenue for several dataflow based optimizations, such as peephole
optimization, fusing MUL+ADD to MAD, and so on.

1 files changed, 113 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/r300/compiler/radeon_dataflow.h b/src/mesa/drivers/dri/r300/compiler/radeon_dataflow.h
new file mode 100644
index 0000000000..c9856affe8
--- /dev/null
+++ b/src/mesa/drivers/dri/r300/compiler/radeon_dataflow.h
@@ -0,0 +1,113 @@
+/*
+ * Copyright (C) 2009 Nicolai Haehnle.
+ *
+ * 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.
+ *
+ */
+
+#ifndef RADEON_DATAFLOW_H
+#define RADEON_DATAFLOW_H
+
+#include "radeon_program_constants.h"
+
+struct radeon_compiler;
+struct rc_instruction;
+struct rc_swizzle_caps;
+
+struct rc_dataflow_vector;
+
+struct rc_dataflow_ref {
+	struct rc_dataflow_vector * Vector;
+
+	/**
+	 * Linked list of references to the above-mentioned vector.
+	 * The linked list is \em not sorted.
+	 */
+	/*@{*/
+	struct rc_dataflow_ref * Prev;
+	struct rc_dataflow_ref * Next;
+	/*@}*/
+
+	unsigned int UseMask:4;
+	struct rc_instruction * ReadInstruction;
+};
+
+struct rc_dataflow_vector {
+	rc_register_file File:3;
+	unsigned int Index:RC_REGISTER_INDEX_BITS;
+
+	/** For private use in compiler passes. MUST BE RESET TO 0 by the end of each pass.
+	 * The annotate pass uses this bit to track whether a vector is in the
+	 * update stack.
+	 */
+	unsigned int PassBit:1;
+	/** Which of the components have been written with useful values */
+	unsigned int ValidMask:4;
+	/** Which of the components are used downstream */
+	unsigned int UseMask:4;
+	/** The instruction that produced this vector */
+	struct rc_instruction * WriteInstruction;
+
+	/** Linked list of references to this vector */
+	struct rc_dataflow_ref Refs;
+};
+
+struct rc_instruction_dataflow {
+	struct rc_dataflow_ref * SrcReg[3];
+	struct rc_dataflow_ref * SrcRegAddress[3];
+
+	/** Reference the components of the destination register
+	 * that are carried over without being overwritten */
+	struct rc_dataflow_ref * DstRegPrev;
+	/** Indicates whether the destination register was in use
+	 * before this instruction */
+	unsigned int DstRegAliased:1;
+	struct rc_dataflow_vector * DstReg;
+};
+
+/**
+ * General functions for manipulating the dataflow structures.
+ */
+/*@{*/
+struct rc_dataflow_ref * rc_dataflow_create_ref(struct radeon_compiler * c,
+		struct rc_dataflow_vector * vector, struct rc_instruction * inst);
+struct rc_dataflow_vector * rc_dataflow_create_vector(struct radeon_compiler * c,
+		rc_register_file file, unsigned int index, struct rc_instruction * inst);
+void rc_dataflow_remove_ref(struct rc_dataflow_ref * ref);
+
+void rc_dataflow_remove_instruction(struct rc_instruction * inst);
+/*@}*/
+
+
+/**
+ * Compiler passes based on dataflow structures.
+ */
+/*@{*/
+typedef void (*rc_dataflow_mark_outputs_fn)(void * userdata, void * data,
+			void (*mark_fn)(void * data, unsigned int index, unsigned int mask));
+void rc_dataflow_annotate(struct radeon_compiler * c, rc_dataflow_mark_outputs_fn dce, void * userdata);
+void rc_dataflow_dealias(struct radeon_compiler * c);
+void rc_dataflow_swizzles(struct radeon_compiler * c);
+/*@}*/
+
+#endif /* RADEON_DATAFLOW_H */