1 /*
2 * Copyright 2010 Tom Stellard <tstellar@gmail.com>
3 *
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining
7 * a copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sublicense, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial
16 * portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
19 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
21 * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
22 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
23 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
24 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 */
27
28 /**
29 * \file
30 */
31
32 #include "radeon_rename_regs.h"
33
34 #include "radeon_compiler.h"
35 #include "radeon_list.h"
36 #include "radeon_program.h"
37 #include "radeon_variable.h"
38
39 /**
40 * This function renames registers in an attempt to get the code close to
41 * SSA form. After this function has completed, most of the register are only
42 * written to one time, with a few exceptions.
43 *
44 * This function assumes all the instructions are still of type
45 * RC_INSTRUCTION_NORMAL.
46 */
rc_rename_regs(struct radeon_compiler * c,void * user)47 void rc_rename_regs(struct radeon_compiler *c, void *user)
48 {
49 unsigned int used_length;
50 struct rc_instruction * inst;
51 unsigned char * used;
52 struct rc_list * variables;
53 struct rc_list * var_ptr;
54
55 /* XXX Remove this once the register allocation works with flow control. */
56 for(inst = c->Program.Instructions.Next;
57 inst != &c->Program.Instructions;
58 inst = inst->Next) {
59 if (inst->U.I.Opcode == RC_OPCODE_BGNLOOP)
60 return;
61 }
62
63 used_length = 2 * rc_recompute_ips(c);
64 used = memory_pool_malloc(&c->Pool, sizeof(unsigned char) * used_length);
65 memset(used, 0, sizeof(unsigned char) * used_length);
66
67 rc_get_used_temporaries(c, used, used_length);
68 variables = rc_get_variables(c);
69
70 for (var_ptr = variables; var_ptr; var_ptr = var_ptr->Next) {
71 int new_index;
72 unsigned writemask;
73 struct rc_variable * var = var_ptr->Item;
74
75 if (var->Inst->U.I.DstReg.File != RC_FILE_TEMPORARY) {
76 continue;
77 }
78
79 new_index = rc_find_free_temporary_list(c, used, used_length,
80 RC_MASK_XYZW);
81 if (new_index < 0) {
82 rc_error(c, "Ran out of temporary registers\n");
83 return;
84 }
85
86 writemask = rc_variable_writemask_sum(var);
87 rc_variable_change_dst(var, new_index, writemask);
88 }
89 }
90