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 */
34
35static nir_ssa_def *
36lower_pack_double(nir_builder *b, nir_ssa_def *src)
37{
38   return nir_pack_double_2x32_split(b, nir_channel(b, src, 0),
39                                        nir_channel(b, src, 1));
40}
41
42static nir_ssa_def *
43lower_unpack_double(nir_builder *b, nir_ssa_def *src)
44{
45   return nir_vec2(b, nir_unpack_double_2x32_split_x(b, src),
46                      nir_unpack_double_2x32_split_y(b, src));
47}
48
49static void
50lower_double_pack_impl(nir_function_impl *impl)
51{
52   nir_builder b;
53   nir_builder_init(&b, impl);
54
55   nir_foreach_block(block, impl) {
56      nir_foreach_instr_safe(instr, block) {
57         if (instr->type != nir_instr_type_alu)
58            continue;
59
60         nir_alu_instr *alu_instr = (nir_alu_instr *) instr;
61
62         if (alu_instr->op != nir_op_pack_double_2x32 &&
63             alu_instr->op != nir_op_unpack_double_2x32)
64            continue;
65
66         b.cursor = nir_before_instr(&alu_instr->instr);
67
68         nir_ssa_def *src = nir_ssa_for_alu_src(&b, alu_instr, 0);
69         nir_ssa_def *dest =
70            alu_instr->op == nir_op_pack_double_2x32 ?
71            lower_pack_double(&b, src) :
72            lower_unpack_double(&b, src);
73
74         nir_ssa_def_rewrite_uses(&alu_instr->dest.dest.ssa, nir_src_for_ssa(dest));
75         nir_instr_remove(&alu_instr->instr);
76      }
77   }
78}
79
80void
81nir_lower_double_pack(nir_shader *shader)
82{
83   nir_foreach_function(function, shader) {
84      if (function->impl)
85         lower_double_pack_impl(function->impl);
86   }
87}
88
89