1/*
2 * Mesa 3-D graphics library
3 *
4 * Copyright (C) 2012-2013 LunarG, Inc.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included
14 * in all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22 * DEALINGS IN THE SOFTWARE.
23 *
24 * Authors:
25 *    Chia-I Wu <olv@lunarg.com>
26 */
27
28#include "toy_compiler.h"
29#include "toy_tgsi.h"
30#include "toy_optimize.h"
31
32/**
33 * This just eliminates instructions with null dst so far.
34 */
35static void
36eliminate_dead_code(struct toy_compiler *tc)
37{
38   struct toy_inst *inst;
39
40   tc_head(tc);
41   while ((inst = tc_next(tc)) != NULL) {
42      switch (inst->opcode) {
43      case GEN6_OPCODE_IF:
44      case GEN6_OPCODE_ELSE:
45      case GEN6_OPCODE_ENDIF:
46      case GEN6_OPCODE_WHILE:
47      case GEN6_OPCODE_BREAK:
48      case GEN6_OPCODE_CONT:
49      case GEN6_OPCODE_SEND:
50      case GEN6_OPCODE_SENDC:
51      case GEN6_OPCODE_NOP:
52         /* never eliminated */
53         break;
54      default:
55         if (tdst_is_null(inst->dst) || !inst->dst.writemask) {
56            /* math is always GEN6_COND_NORMAL */
57            if ((inst->opcode == GEN6_OPCODE_MATH ||
58                 inst->cond_modifier == GEN6_COND_NONE) &&
59                !inst->acc_wr_ctrl)
60               tc_discard_inst(tc, inst);
61         }
62         break;
63      }
64   }
65}
66
67void
68toy_compiler_optimize(struct toy_compiler *tc)
69{
70   eliminate_dead_code(tc);
71}
72