1 files changed, 92 insertions, 0 deletions
diff --git a/src/gallium/drivers/r300/compiler/radeon_rename_regs.c b/src/gallium/drivers/r300/compiler/radeon_rename_regs.c
new file mode 100644
index 00000000000..cafa0579734
--- /dev/null
+++ b/src/gallium/drivers/r300/compiler/radeon_rename_regs.c
@@ -0,0 +1,92 @@
+/*
+ * Copyright 2010 Tom Stellard <[email protected]>
+ *
+ * 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_rename_regs.h"
+
+#include "radeon_compiler.h"
+#include "radeon_dataflow.h"
+#include "radeon_program.h"
+
+/**
+ * This function renames registers in an attempt to get the code close to
+ * SSA form.  After this function has completed, most of the register are only
+ * written to one time, with a few exceptions.
+ *
+ * This function assumes all the instructions are still of type
+ * RC_INSTRUCTION_NORMAL.
+ */
+void rc_rename_regs(struct radeon_compiler *c, void *user)
+{
+	unsigned int i, used_length;
+	int new_index;
+	struct rc_instruction * inst;
+	struct rc_reader_data reader_data;
+	unsigned char * used;
+
+	/* XXX Remove this once the register allocation works with flow control. */
+	for(inst = c->Program.Instructions.Next;
+					inst != &c->Program.Instructions;
+					inst = inst->Next) {
+		if (inst->U.I.Opcode == RC_OPCODE_BGNLOOP)
+			return;
+	}
+
+	used_length = 2 * rc_recompute_ips(c);
+	used = memory_pool_malloc(&c->Pool, sizeof(unsigned char) * used_length);
+	memset(used, 0, sizeof(unsigned char) * used_length);
+
+	rc_get_used_temporaries(c, used, used_length);
+	for(inst = c->Program.Instructions.Next;
+					inst != &c->Program.Instructions;
+					inst = inst->Next) {
+
+		if (inst->U.I.DstReg.File != RC_FILE_TEMPORARY)
+			continue;
+
+		reader_data.ExitOnAbort = 1;
+		rc_get_readers(c, inst, &reader_data, NULL, NULL, NULL);
+
+		if (reader_data.Abort || reader_data.ReaderCount == 0)
+			continue;
+
+		new_index = rc_find_free_temporary_list(c, used, used_length,
+						RC_MASK_XYZW);
+		if (new_index < 0) {
+			rc_error(c, "Ran out of temporary registers\n");
+			return;
+		}
+
+		reader_data.Writer->U.I.DstReg.Index = new_index;
+		for(i = 0; i < reader_data.ReaderCount; i++) {
+			reader_data.Readers[i].U.I.Src->Index = new_index;
+		}
+	}
+}