1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
|
/*
* Copyright (C) 2019 Alyssa Rosenzweig <alyssa@rosenzweig.io>
*
* 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 AUTHORS OR COPYRIGHT HOLDERS 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 "compiler.h"
void mir_rewrite_index_src_single(midgard_instruction *ins, unsigned old, unsigned new)
{
if (ins->ssa_args.src0 == old)
ins->ssa_args.src0 = new;
if (ins->ssa_args.src1 == old &&
!ins->ssa_args.inline_constant)
ins->ssa_args.src1 = new;
}
void
mir_rewrite_index_src(compiler_context *ctx, unsigned old, unsigned new)
{
mir_foreach_instr_global(ctx, ins) {
mir_rewrite_index_src_single(ins, old, new);
}
}
void
mir_rewrite_index_dst(compiler_context *ctx, unsigned old, unsigned new)
{
mir_foreach_instr_global(ctx, ins) {
if (ins->ssa_args.dest == old)
ins->ssa_args.dest = new;
}
}
void
mir_rewrite_index(compiler_context *ctx, unsigned old, unsigned new)
{
mir_rewrite_index_src(ctx, old, new);
mir_rewrite_index_dst(ctx, old, new);
}
/* Checks if a value is used only once (or totally dead), which is an important
* heuristic to figure out if certain optimizations are Worth It (TM) */
bool
mir_single_use(compiler_context *ctx, unsigned value)
{
unsigned used_count = 0;
mir_foreach_instr_global(ctx, ins) {
if (mir_has_arg(ins, value))
++used_count;
/* Short circuit for speed */
if (used_count > 1)
return false;
}
return used_count <= 1;
}
|
