2 * Copyright (C) 2018 Alyssa Rosenzweig
3 * Copyright (C) 2019 Collabora, Ltd.
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
12 * The above copyright notice and this permission notice (including the next
13 * paragraph) shall be included in all copies or substantial portions of the
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 FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
26 #include "midgard_ops.h"
28 /* Special case for copypropagating the results of vectors */
31 midgard_opt_copy_prop_reg(compiler_context
*ctx
, midgard_block
*block
)
33 bool progress
= false;
35 mir_foreach_instr_in_block_safe(block
, ins
) {
36 if (ins
->type
!= TAG_ALU_4
) continue;
37 if (!OP_IS_MOVE(ins
->alu
.op
)) continue;
39 unsigned from
= ins
->src
[1];
40 unsigned to
= ins
->dest
;
42 if (!(to
& PAN_IS_REG
)) continue;
43 if (from
& PAN_IS_REG
) continue;
45 if (ins
->has_inline_constant
) continue;
46 if (ins
->has_constants
) continue;
47 if (mir_nontrivial_mod(ins
, 1, true)) continue;
48 if (mir_nontrivial_outmod(ins
)) continue;
49 if (!mir_single_use(ctx
, from
)) continue;
51 /* Ensure mask is continguous from 0 */
52 if (!(ins
->mask
& (1 << COMPONENT_X
))) continue;
53 if (ins
->mask
& (ins
->mask
+ 1)) continue;
55 mir_rewrite_index_dst(ctx
, from
, ins
->dest
);
56 mir_remove_instruction(ins
);
64 midgard_opt_copy_prop(compiler_context
*ctx
, midgard_block
*block
)
66 bool progress
= false;
68 mir_foreach_instr_in_block_safe(block
, ins
) {
69 if (ins
->type
!= TAG_ALU_4
) continue;
70 if (!OP_IS_MOVE(ins
->alu
.op
)) continue;
72 unsigned from
= ins
->src
[1];
73 unsigned to
= ins
->dest
;
75 /* We only work on pure SSA */
77 if (to
& PAN_IS_REG
) continue;
78 if (from
& PAN_IS_REG
) continue;
80 /* Constant propagation is not handled here, either */
81 if (ins
->has_inline_constant
) continue;
82 if (ins
->has_constants
) continue;
84 /* Modifier propagation is not handled here */
85 if (mir_nontrivial_mod(ins
, 1, false)) continue;
86 if (mir_nontrivial_outmod(ins
)) continue;
88 /* Shortened arguments (bias for textures, extra load/store
89 * arguments, etc.) do not get a swizzle, only a start
90 * component and even that is restricted. Fragment writeout
91 * doesn't even get that much */
95 mir_foreach_instr_global(ctx
, q
) {
96 bool is_tex
= q
->type
== TAG_TEXTURE_4
;
97 bool is_ldst
= q
->type
== TAG_LOAD_STORE_4
;
98 bool is_branch
= q
->compact_branch
;
100 if (!(is_tex
|| is_ldst
|| is_branch
)) continue;
102 /* For textures, we get a real swizzle for the
103 * coordinate and the content. For stores, we get one.
104 * For loads, we get none. */
108 OP_IS_STORE(q
->load_store
.op
) ? 1 : 0;
110 mir_foreach_src(q
, s
) {
111 if ((s
>= start
) && q
->src
[s
] == to
) {
121 /* We're clear -- rewrite, composing the swizzle */
122 mir_rewrite_index_src_swizzle(ctx
, to
, from
, ins
->swizzle
[1]);
123 mir_remove_instruction(ins
);
127 return progress
| midgard_opt_copy_prop_reg(ctx
, block
);