1 /*
2 * Copyright (C) 2020 Collabora, Ltd.
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 * Authors (Collabora):
24 * Alyssa Rosenzweig <[email protected]>
25 */
26
27 /* Fuses f2f16 modifiers into loads */
28
29 #include "compiler/nir/nir.h"
30 #include "compiler/nir/nir_builder.h"
31 #include "panfrost/util/pan_ir.h"
32
33 bool nir_fuse_io_16(nir_shader *shader);
34
35 static bool
nir_src_is_f2fmp(nir_src * use)36 nir_src_is_f2fmp(nir_src *use)
37 {
38 nir_instr *parent = nir_src_parent_instr(use);
39
40 if (parent->type != nir_instr_type_alu)
41 return false;
42
43 nir_alu_instr *alu = nir_instr_as_alu(parent);
44 return (alu->op == nir_op_f2fmp);
45 }
46
47 bool
nir_fuse_io_16(nir_shader * shader)48 nir_fuse_io_16(nir_shader *shader)
49 {
50 bool progress = false;
51
52 nir_foreach_function_impl(impl, shader) {
53 nir_foreach_block(block, impl) {
54 nir_foreach_instr_safe(instr, block) {
55 if (instr->type != nir_instr_type_intrinsic)
56 continue;
57
58 nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
59
60 if (intr->intrinsic != nir_intrinsic_load_interpolated_input)
61 continue;
62
63 if (intr->def.bit_size != 32)
64 continue;
65
66 /* We swizzle at a 32-bit level so need a multiple of 2. We could
67 * do a bit better and handle even components though */
68 if (nir_intrinsic_component(intr))
69 continue;
70
71 bool valid = true;
72
73 nir_foreach_use_including_if(src, &intr->def)
74 valid &= !nir_src_is_if(src) && nir_src_is_f2fmp(src);
75
76 if (!valid)
77 continue;
78
79 intr->def.bit_size = 16;
80
81 nir_builder b = nir_builder_at(nir_after_instr(instr));
82
83 /* The f2f32(f2fmp(x)) will cancel by opt_algebraic */
84 nir_def *conv = nir_f2f32(&b, &intr->def);
85 nir_def_rewrite_uses_after(&intr->def, conv, conv->parent_instr);
86
87 progress |= true;
88 }
89 }
90
91 nir_metadata_preserve(impl,
92 nir_metadata_control_flow);
93 }
94
95 return progress;
96 }
97