1 /*
2 * Copyright © 2020 Intel Corporation
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 #include "nir_conversion_builder.h"
27
28 static bool
try_simplify_convert_intrin(nir_intrinsic_instr * conv)29 try_simplify_convert_intrin(nir_intrinsic_instr *conv)
30 {
31 bool progress = false;
32
33 nir_alu_type src_type = nir_intrinsic_src_type(conv);
34 nir_alu_type dest_type = nir_intrinsic_dest_type(conv);
35
36 nir_rounding_mode rounding = nir_intrinsic_rounding_mode(conv);
37 nir_rounding_mode simple_rounding =
38 nir_simplify_conversion_rounding(src_type, dest_type, rounding);
39 if (rounding != simple_rounding) {
40 nir_intrinsic_set_rounding_mode(conv, simple_rounding);
41 progress = true;
42 }
43
44 if (nir_intrinsic_saturate(conv) &&
45 nir_alu_type_range_contains_type_range(dest_type, src_type)) {
46 nir_intrinsic_set_saturate(conv, false);
47 progress = true;
48 }
49
50 return progress;
51 }
52
53 static bool
lower_convert_alu_types_instr(nir_builder * b,nir_intrinsic_instr * conv,void * data)54 lower_convert_alu_types_instr(nir_builder *b, nir_intrinsic_instr *conv, void *data)
55 {
56 bool (*cb)(nir_intrinsic_instr *) = data;
57 if (conv->intrinsic != nir_intrinsic_convert_alu_types || (cb && !cb(conv)))
58 return false;
59
60 b->cursor = nir_instr_remove(&conv->instr);
61 nir_def *val =
62 nir_convert_with_rounding(b, conv->src[0].ssa,
63 nir_intrinsic_src_type(conv),
64 nir_intrinsic_dest_type(conv),
65 nir_intrinsic_rounding_mode(conv),
66 nir_intrinsic_saturate(conv));
67 nir_def_rewrite_uses(&conv->def, val);
68 return true;
69 }
70
71 static bool
opt_simplify(nir_builder * b,nir_intrinsic_instr * intr,void * _)72 opt_simplify(nir_builder *b, nir_intrinsic_instr *intr, void *_)
73 {
74 if (intr->intrinsic != nir_intrinsic_convert_alu_types)
75 return false;
76
77 bool progress = try_simplify_convert_intrin(intr);
78
79 if (nir_intrinsic_rounding_mode(intr) == nir_rounding_mode_undef &&
80 !nir_intrinsic_saturate(intr)) {
81 lower_convert_alu_types_instr(b, intr, NULL);
82 progress = true;
83 }
84
85 return progress;
86 }
87
88 bool
nir_opt_simplify_convert_alu_types(nir_shader * shader)89 nir_opt_simplify_convert_alu_types(nir_shader *shader)
90 {
91 return nir_shader_intrinsics_pass(shader, opt_simplify,
92 nir_metadata_control_flow, NULL);
93 }
94
95 bool
nir_lower_convert_alu_types(nir_shader * shader,bool (* should_lower)(nir_intrinsic_instr *))96 nir_lower_convert_alu_types(nir_shader *shader,
97 bool (*should_lower)(nir_intrinsic_instr *))
98 {
99 return nir_shader_intrinsics_pass(shader, lower_convert_alu_types_instr,
100 nir_metadata_control_flow, should_lower);
101 }
102
103 static bool
is_constant(nir_intrinsic_instr * conv)104 is_constant(nir_intrinsic_instr *conv)
105 {
106 assert(conv->intrinsic == nir_intrinsic_convert_alu_types);
107 return nir_src_is_const(conv->src[0]);
108 }
109
110 bool
nir_lower_constant_convert_alu_types(nir_shader * shader)111 nir_lower_constant_convert_alu_types(nir_shader *shader)
112 {
113 return nir_lower_convert_alu_types(shader, is_constant);
114 }
115
116 static bool
is_alu_conversion(const nir_instr * instr,UNUSED const void * _data)117 is_alu_conversion(const nir_instr *instr, UNUSED const void *_data)
118 {
119 return instr->type == nir_instr_type_alu &&
120 nir_op_infos[nir_instr_as_alu(instr)->op].is_conversion;
121 }
122
123 static nir_def *
lower_alu_conversion(nir_builder * b,nir_instr * instr,UNUSED void * _data)124 lower_alu_conversion(nir_builder *b, nir_instr *instr, UNUSED void *_data)
125 {
126 nir_alu_instr *alu = nir_instr_as_alu(instr);
127 nir_def *src = nir_ssa_for_alu_src(b, alu, 0);
128 nir_alu_type src_type = nir_op_infos[alu->op].input_types[0] | src->bit_size;
129 nir_alu_type dst_type = nir_op_infos[alu->op].output_type;
130 return nir_convert_alu_types(b, alu->def.bit_size, src,
131 .src_type = src_type, .dest_type = dst_type,
132 .rounding_mode = nir_rounding_mode_undef,
133 .saturate = false);
134 }
135
136 bool
nir_lower_alu_conversion_to_intrinsic(nir_shader * shader)137 nir_lower_alu_conversion_to_intrinsic(nir_shader *shader)
138 {
139 return nir_shader_lower_instructions(shader, is_alu_conversion,
140 lower_alu_conversion, NULL);
141 }
142