1 /*
2 * Copyright © 2019 Vasily Khoruzhick <anarsoul@gmail.com>
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 */
23
24 #include "nir.h"
25 #include "nir_builder.h"
26
27 #include "lima_ir.h"
28
29 static bool
lima_nir_split_load_input_instr(nir_builder * b,nir_instr * instr,UNUSED void * cb_data)30 lima_nir_split_load_input_instr(nir_builder *b,
31 nir_instr *instr,
32 UNUSED void *cb_data)
33 {
34 if (instr->type != nir_instr_type_alu)
35 return false;
36
37 nir_alu_instr *alu = nir_instr_as_alu(instr);
38 if (alu->op != nir_op_mov)
39 return false;
40
41 if (!alu->dest.dest.is_ssa)
42 return false;
43
44 if (!alu->src[0].src.is_ssa)
45 return false;
46
47 nir_ssa_def *ssa = alu->src[0].src.ssa;
48 if (ssa->parent_instr->type != nir_instr_type_intrinsic)
49 return false;
50
51 nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(ssa->parent_instr);
52 if (intrin->intrinsic != nir_intrinsic_load_input)
53 return false;
54
55 uint8_t swizzle = alu->src[0].swizzle[0];
56 int i;
57
58 for (i = 1; i < nir_dest_num_components(alu->dest.dest); i++)
59 if (alu->src[0].swizzle[i] != (swizzle + i))
60 break;
61
62 if (i != nir_dest_num_components(alu->dest.dest))
63 return false;
64
65 /* mali4xx can't access unaligned vec3, don't split load input */
66 if (nir_dest_num_components(alu->dest.dest) == 3 && swizzle > 0)
67 return false;
68
69 /* mali4xx can't access unaligned vec2, don't split load input */
70 if (nir_dest_num_components(alu->dest.dest) == 2 &&
71 swizzle != 0 && swizzle != 2)
72 return false;
73
74 b->cursor = nir_before_instr(&intrin->instr);
75 nir_intrinsic_instr *new_intrin = nir_intrinsic_instr_create(
76 b->shader,
77 intrin->intrinsic);
78 nir_ssa_dest_init(&new_intrin->instr, &new_intrin->dest,
79 nir_dest_num_components(alu->dest.dest),
80 ssa->bit_size,
81 NULL);
82 new_intrin->num_components = nir_dest_num_components(alu->dest.dest);
83 nir_intrinsic_set_base(new_intrin, nir_intrinsic_base(intrin));
84 nir_intrinsic_set_component(new_intrin, nir_intrinsic_component(intrin) + swizzle);
85 nir_intrinsic_set_dest_type(new_intrin, nir_intrinsic_dest_type(intrin));
86
87 /* offset */
88 nir_src_copy(&new_intrin->src[0], &intrin->src[0]);
89
90 nir_builder_instr_insert(b, &new_intrin->instr);
91 nir_ssa_def_rewrite_uses(&alu->dest.dest.ssa,
92 &new_intrin->dest.ssa);
93 nir_instr_remove(&alu->instr);
94 return true;
95 }
96
97 /* Replaces a single load of several packed varyings and number of movs with
98 * a number of loads of smaller size
99 */
100 bool
lima_nir_split_load_input(nir_shader * shader)101 lima_nir_split_load_input(nir_shader *shader)
102 {
103 return nir_shader_instructions_pass(shader, lima_nir_split_load_input_instr,
104 nir_metadata_block_index |
105 nir_metadata_dominance,
106 NULL);
107 }
108