From e95e76e1255a3ad0ce604271301d090337b2e82b Mon Sep 17 00:00:00 2001
From: Nicolai Hähnle <nhaehnle@gmail.com>
Date: Sun, 6 Sep 2009 11:47:40 +0200
Subject: 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.
---
 .../drivers/dri/r300/compiler/radeon_dataflow.c    | 106 +++++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100644 src/mesa/drivers/dri/r300/compiler/radeon_dataflow.c

(limited to 'src/mesa/drivers/dri/r300/compiler/radeon_dataflow.c')

diff --git a/src/mesa/drivers/dri/r300/compiler/radeon_dataflow.c b/src/mesa/drivers/dri/r300/compiler/radeon_dataflow.c
new file mode 100644
index 0000000000..af6777a7bd
--- /dev/null
+++ b/src/mesa/drivers/dri/r300/compiler/radeon_dataflow.c
@@ -0,0 +1,106 @@
+/*
+ * 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.
+ *
+ */
+
+#include "radeon_dataflow.h"
+
+#include "radeon_compiler.h"
+
+
+static void add_ref_to_vector(struct rc_dataflow_ref * ref, struct rc_dataflow_vector * vector)
+{
+	ref->Vector = vector;
+	ref->Prev = &vector->Refs;
+	ref->Next = vector->Refs.Next;
+	ref->Prev->Next = ref;
+	ref->Next->Prev = ref;
+}
+
+struct rc_dataflow_ref * rc_dataflow_create_ref(struct radeon_compiler * c,
+		struct rc_dataflow_vector * vector, struct rc_instruction * inst)
+{
+	struct rc_dataflow_ref * ref = memory_pool_malloc(&c->Pool, sizeof(struct rc_dataflow_ref));
+	ref->ReadInstruction = inst;
+	ref->UseMask = 0;
+
+	add_ref_to_vector(ref, vector);
+
+	return ref;
+}
+
+struct rc_dataflow_vector * rc_dataflow_create_vector(struct radeon_compiler * c,
+		rc_register_file file, unsigned int index, struct rc_instruction * inst)
+{
+	struct rc_dataflow_vector * vec = memory_pool_malloc(&c->Pool, sizeof(struct rc_dataflow_vector));
+
+	memset(vec, 0, sizeof(struct rc_dataflow_vector));
+	vec->File = file;
+	vec->Index = index;
+	vec->WriteInstruction = inst;
+
+	vec->Refs.Next = vec->Refs.Prev = &vec->Refs;
+
+	return vec;
+}
+
+void rc_dataflow_remove_ref(struct rc_dataflow_ref * ref)
+{
+	ref->Prev->Next = ref->Next;
+	ref->Next->Prev = ref->Prev;
+}
+
+void rc_dataflow_remove_instruction(struct rc_instruction * inst)
+{
+	for(unsigned int i = 0; i < 3; ++i) {
+		if (inst->Dataflow.SrcReg[i]) {
+			rc_dataflow_remove_ref(inst->Dataflow.SrcReg[i]);
+			inst->Dataflow.SrcReg[i] = 0;
+		}
+		if (inst->Dataflow.SrcRegAddress[i]) {
+			rc_dataflow_remove_ref(inst->Dataflow.SrcRegAddress[i]);
+			inst->Dataflow.SrcRegAddress[i] = 0;
+		}
+	}
+
+	if (inst->Dataflow.DstReg) {
+		while(inst->Dataflow.DstReg->Refs.Next != &inst->Dataflow.DstReg->Refs) {
+			struct rc_dataflow_ref * ref = inst->Dataflow.DstReg->Refs.Next;
+			rc_dataflow_remove_ref(ref);
+			if (inst->Dataflow.DstRegPrev)
+				add_ref_to_vector(ref, inst->Dataflow.DstRegPrev->Vector);
+		}
+
+		inst->Dataflow.DstReg->WriteInstruction = 0;
+		inst->Dataflow.DstReg = 0;
+	}
+
+	if (inst->Dataflow.DstRegPrev) {
+		rc_dataflow_remove_ref(inst->Dataflow.DstRegPrev);
+		inst->Dataflow.DstRegPrev = 0;
+	}
+
+	inst->Dataflow.DstRegAliased = 0;
+}
-- 
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