1/*
2 * Copyright © 2022 Imagination Technologies Ltd.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a copy
5 * of this software and associated documentation files (the "Software"), to deal
6 * in the Software without restriction, including without limitation the rights
7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8 * copies of the Software, and to permit persons to whom the Software is
9 * 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 THE
18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 * SOFTWARE.
22 */
23
24#ifndef ROGUE_NIR_HELPERS_H
25#define ROGUE_NIR_HELPERS_H
26
27#include <assert.h>
28#include <stddef.h>
29#include <stdint.h>
30
31#include "nir/nir.h"
32#include "util/bitscan.h"
33
34/**
35 * \file rogue_nir.c
36 *
37 * \brief Contains various NIR helper functions.
38 */
39
40static inline unsigned nir_alu_dest_regindex(const nir_alu_instr *alu)
41{
42   assert(!alu->dest.dest.is_ssa);
43
44   return alu->dest.dest.reg.reg->index;
45}
46
47static inline unsigned nir_alu_dest_comp(const nir_alu_instr *alu)
48{
49   assert(!alu->dest.dest.is_ssa);
50   assert(util_is_power_of_two_nonzero(alu->dest.write_mask));
51
52   return ffs(alu->dest.write_mask) - 1;
53}
54
55static inline unsigned nir_alu_src_regindex(const nir_alu_instr *alu,
56                                            size_t src)
57{
58   assert(src < nir_op_infos[alu->op].num_inputs);
59   assert(!alu->src[src].src.is_ssa);
60
61   return alu->src[src].src.reg.reg->index;
62}
63
64static inline uint32_t nir_alu_src_const(const nir_alu_instr *alu, size_t src)
65{
66   assert(src < nir_op_infos[alu->op].num_inputs);
67   assert(alu->src[src].src.is_ssa);
68
69   nir_const_value *const_value = nir_src_as_const_value(alu->src[src].src);
70
71   return nir_const_value_as_uint(*const_value, 32);
72}
73
74static inline bool nir_alu_src_is_const(const nir_alu_instr *alu, size_t src)
75{
76   assert(src < nir_op_infos[alu->op].num_inputs);
77
78   if (!alu->src[src].src.is_ssa)
79      return false;
80
81   assert(alu->src[src].src.ssa->parent_instr);
82
83   return (alu->src[src].src.ssa->parent_instr->type ==
84           nir_instr_type_load_const);
85}
86
87static inline unsigned nir_intr_dest_regindex(const nir_intrinsic_instr *intr)
88{
89   assert(!intr->dest.is_ssa);
90
91   return intr->dest.reg.reg->index;
92}
93
94static inline unsigned nir_intr_src_regindex(const nir_intrinsic_instr *intr,
95                                             size_t src)
96{
97   assert(src < nir_intrinsic_infos[intr->intrinsic].num_srcs);
98   assert(!intr->src[src].is_ssa);
99
100   return intr->src[src].reg.reg->index;
101}
102
103static inline uint32_t nir_intr_src_const(const nir_intrinsic_instr *intr,
104                                          size_t src)
105{
106   assert(src < nir_intrinsic_infos[intr->intrinsic].num_srcs);
107   assert(intr->src[src].is_ssa);
108
109   nir_const_value *const_value = nir_src_as_const_value(intr->src[src]);
110
111   return nir_const_value_as_uint(*const_value, 32);
112}
113
114static inline uint32_t nir_intr_src_comp_const(const nir_intrinsic_instr *intr,
115                                               size_t src,
116                                               size_t comp)
117{
118   assert(src < nir_intrinsic_infos[intr->intrinsic].num_srcs);
119   assert(intr->src[src].is_ssa);
120   assert(comp < nir_src_num_components(intr->src[src]));
121
122   return nir_src_comp_as_uint(intr->src[src], comp);
123}
124
125static inline bool nir_intr_src_is_const(const nir_intrinsic_instr *intr,
126                                         size_t src)
127{
128   assert(src < nir_intrinsic_infos[intr->intrinsic].num_srcs);
129
130   if (!intr->src[src].is_ssa)
131      return false;
132
133   assert(intr->src[src].ssa->parent_instr);
134
135   return (intr->src[src].ssa->parent_instr->type == nir_instr_type_load_const);
136}
137
138static inline size_t nir_count_variables_with_modes(const nir_shader *nir,
139                                                    nir_variable_mode mode)
140{
141   size_t count = 0;
142
143   nir_foreach_variable_with_modes (var, nir, mode)
144      ++count;
145
146   return count;
147}
148
149#endif /* ROGUE_NIR_HELPERS_H */
150