From d8d086c20b5a43353c4980cf234d8329900585f5 Mon Sep 17 00:00:00 2001
From: Nicolai Haehnle <nhaehnle@gmail.com>
Date: Sun, 6 Jul 2008 19:48:50 +0200
Subject: r500: Add "Not quite SSA" and dead code elimination pass

In addition, this pass fixes non-native swizzles.
---
 src/mesa/drivers/dri/r300/radeon_nqssadce.h | 96 +++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 src/mesa/drivers/dri/r300/radeon_nqssadce.h

(limited to 'src/mesa/drivers/dri/r300/radeon_nqssadce.h')

diff --git a/src/mesa/drivers/dri/r300/radeon_nqssadce.h b/src/mesa/drivers/dri/r300/radeon_nqssadce.h
new file mode 100644
index 0000000000..a4f94abcb6
--- /dev/null
+++ b/src/mesa/drivers/dri/r300/radeon_nqssadce.h
@@ -0,0 +1,96 @@
+/*
+ * Copyright (C) 2008 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_PROGRAM_NQSSADCE_H_
+#define __RADEON_PROGRAM_NQSSADCE_H_
+
+#include "radeon_program.h"
+
+
+struct register_state {
+	/**
+	 * Bitmask indicating which components of the register are sourced
+	 * by later instructions.
+	 */
+	GLuint Sourced : 4;
+};
+
+/**
+ * Maintain state such as which registers are used, which registers are
+ * read from, etc.
+ */
+struct nqssadce_state {
+	GLcontext *Ctx;
+	struct gl_program *Program;
+	struct radeon_nqssadce_descr *Descr;
+
+	/**
+	 * All instructions after this instruction pointer have been dealt with.
+	 */
+	int IP;
+
+	/**
+	 * Which registers are read by subsequent instructions?
+	 */
+	struct register_state Temps[MAX_PROGRAM_TEMPS];
+	struct register_state Outputs[VERT_RESULT_MAX];
+};
+
+
+/**
+ * This structure contains a description of the hardware in-so-far as
+ * it is required for the NqSSA-DCE pass.
+ */
+struct radeon_nqssadce_descr {
+	/**
+	 * Fill in which outputs
+	 */
+	void (*Init)(struct nqssadce_state *);
+
+	/**
+	 * Check whether the given swizzle, absolute and negate combination
+	 * can be implemented natively by the hardware for this opcode.
+	 */
+	GLboolean (*IsNativeSwizzle)(GLuint opcode, struct prog_src_register reg);
+
+	/**
+	 * Emit (at the current IP) the instruction MOV dst, src;
+	 * The transformation will work recursively on the emitted instruction(s).
+	 */
+	void (*BuildSwizzle)(struct nqssadce_state*, struct prog_dst_register dst, struct prog_src_register src);
+
+	/**
+	 * Rewrite instructions that write to DEPR.z to write to DEPR.w
+	 * instead (rewriting is done *before* the WriteMask test).
+	 */
+	GLboolean RewriteDepthOut;
+	void *Data;
+};
+
+void radeonNqssaDce(GLcontext *ctx, struct gl_program *p, struct radeon_nqssadce_descr* descr);
+
+#endif /* __RADEON_PROGRAM_NQSSADCE_H_ */
-- 
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