1 /*
2 * Copyright © 2015 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
25 #include "nir.h"
26 #include "nir_builder.h"
27
28 /*
29 * lowers:
30 *
31 * packDouble2x32(foo) -> packDouble2x32Split(foo.x, foo.y)
32 * unpackDouble2x32(foo) -> vec2(unpackDouble2x32_x(foo), unpackDouble2x32_y(foo))
33 * packInt2x32(foo) -> packInt2x32Split(foo.x, foo.y)
34 * unpackInt2x32(foo) -> vec2(unpackInt2x32_x(foo), unpackInt2x32_y(foo))
35 */
36
37 static nir_ssa_def *
lower_pack_64(nir_builder * b,nir_ssa_def * src)38 lower_pack_64(nir_builder *b, nir_ssa_def *src)
39 {
40 return nir_pack_64_2x32_split(b, nir_channel(b, src, 0),
41 nir_channel(b, src, 1));
42 }
43
44 static nir_ssa_def *
lower_unpack_64(nir_builder * b,nir_ssa_def * src)45 lower_unpack_64(nir_builder *b, nir_ssa_def *src)
46 {
47 return nir_vec2(b, nir_unpack_64_2x32_split_x(b, src),
48 nir_unpack_64_2x32_split_y(b, src));
49 }
50
51 static bool
lower_64bit_pack_impl(nir_function_impl * impl)52 lower_64bit_pack_impl(nir_function_impl *impl)
53 {
54 nir_builder b;
55 nir_builder_init(&b, impl);
56 bool progress = false;
57
58 nir_foreach_block(block, impl) {
59 nir_foreach_instr_safe(instr, block) {
60 if (instr->type != nir_instr_type_alu)
61 continue;
62
63 nir_alu_instr *alu_instr = (nir_alu_instr *) instr;
64
65 if (alu_instr->op != nir_op_pack_64_2x32 &&
66 alu_instr->op != nir_op_unpack_64_2x32)
67 continue;
68
69 b.cursor = nir_before_instr(&alu_instr->instr);
70
71 nir_ssa_def *src = nir_ssa_for_alu_src(&b, alu_instr, 0);
72 nir_ssa_def *dest;
73
74 switch (alu_instr->op) {
75 case nir_op_pack_64_2x32:
76 dest = lower_pack_64(&b, src);
77 break;
78 case nir_op_unpack_64_2x32:
79 dest = lower_unpack_64(&b, src);
80 break;
81 default:
82 unreachable("Impossible opcode");
83 }
84
85 nir_ssa_def_rewrite_uses(&alu_instr->dest.dest.ssa, nir_src_for_ssa(dest));
86 nir_instr_remove(&alu_instr->instr);
87 nir_metadata_preserve(impl, nir_metadata_block_index |
88 nir_metadata_dominance);
89 progress = true;
90 }
91 }
92
93 return progress;
94 }
95
96 bool
nir_lower_64bit_pack(nir_shader * shader)97 nir_lower_64bit_pack(nir_shader *shader)
98 {
99 bool progress = false;
100
101 nir_foreach_function(function, shader) {
102 if (function->impl)
103 progress |= lower_64bit_pack_impl(function->impl);
104 }
105
106 return false;
107 }
108