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 "util/u_math.h"
33
34 #include "radeon_rename_regs.h"
35
36 #include "radeon_compiler.h"
37 #include "radeon_list.h"
38 #include "radeon_program.h"
39 #include "radeon_variable.h"
40
41 /**
42 * This function renames registers in an attempt to get the code close to
43 * SSA form. After this function has completed, most of the register are only
44 * written to one time, with a few exceptions.
45 *
46 * This function assumes all the instructions are still of type
47 * RC_INSTRUCTION_NORMAL.
48 */
rc_rename_regs(struct radeon_compiler * c,void * user)49 void rc_rename_regs(struct radeon_compiler *c, void *user)
50 {
51 unsigned int used_length;
52 struct rc_instruction * inst;
53 unsigned char * used;
54 struct rc_list * variables;
55 struct rc_list * var_ptr;
56
57 /* XXX Remove this once the register allocation works with flow control. */
58 for(inst = c->Program.Instructions.Next;
59 inst != &c->Program.Instructions;
60 inst = inst->Next) {
61 if (inst->U.I.Opcode == RC_OPCODE_BGNLOOP)
62 return;
63 }
64
65 used_length = MIN2(2 * rc_recompute_ips(c), RC_REGISTER_MAX_INDEX);
66 used = memory_pool_malloc(&c->Pool, sizeof(unsigned char) * used_length);
67 memset(used, 0, sizeof(unsigned char) * used_length);
68
69 rc_get_used_temporaries(c, used, used_length);
70 variables = rc_get_variables(c);
71
72 for (var_ptr = variables; var_ptr; var_ptr = var_ptr->Next) {
73 int new_index;
74 unsigned writemask;
75 struct rc_variable * var = var_ptr->Item;
76
77 if (var->Inst->U.I.DstReg.File != RC_FILE_TEMPORARY) {
78 continue;
79 }
80
81 new_index = rc_find_free_temporary_list(c, used, used_length,
82 RC_MASK_XYZW);
83 if (new_index < 0) {
84 rc_error(c, "Ran out of temporary registers\n");
85 return;
86 }
87
88 writemask = rc_variable_writemask_sum(var);
89 rc_variable_change_dst(var, new_index, writemask);
90 }
91 }
92