1/*
2 * Copyright © 2021 Valve 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 "aco_ir.h"
26
27#include <vector>
28
29namespace aco {
30namespace {
31
32struct idx_ctx {
33   std::vector<RegClass> temp_rc = {s1};
34   std::vector<uint32_t> renames;
35};
36
37inline void
38reindex_defs(idx_ctx& ctx, aco_ptr<Instruction>& instr)
39{
40   for (Definition& def : instr->definitions) {
41      if (!def.isTemp())
42         continue;
43      uint32_t new_id = ctx.temp_rc.size();
44      RegClass rc = def.regClass();
45      ctx.renames[def.tempId()] = new_id;
46      ctx.temp_rc.emplace_back(rc);
47      def.setTemp(Temp(new_id, rc));
48   }
49}
50
51inline void
52reindex_ops(idx_ctx& ctx, aco_ptr<Instruction>& instr)
53{
54   for (Operand& op : instr->operands) {
55      if (!op.isTemp())
56         continue;
57      uint32_t new_id = ctx.renames[op.tempId()];
58      assert(op.regClass() == ctx.temp_rc[new_id]);
59      op.setTemp(Temp(new_id, op.regClass()));
60   }
61}
62
63void
64reindex_program(idx_ctx& ctx, Program* program)
65{
66   ctx.renames.resize(program->peekAllocationId());
67
68   for (Block& block : program->blocks) {
69      auto it = block.instructions.begin();
70      /* for phis, only reindex the definitions */
71      while (is_phi(*it)) {
72         reindex_defs(ctx, *it++);
73      }
74      /* reindex all other instructions */
75      while (it != block.instructions.end()) {
76         reindex_defs(ctx, *it);
77         reindex_ops(ctx, *it);
78         ++it;
79      }
80   }
81   /* update the phi operands */
82   for (Block& block : program->blocks) {
83      auto it = block.instructions.begin();
84      while (is_phi(*it)) {
85         reindex_ops(ctx, *it++);
86      }
87   }
88
89   /* update program members */
90   program->private_segment_buffer = Temp(ctx.renames[program->private_segment_buffer.id()],
91                                          program->private_segment_buffer.regClass());
92   program->scratch_offset =
93      Temp(ctx.renames[program->scratch_offset.id()], program->scratch_offset.regClass());
94   program->temp_rc = ctx.temp_rc;
95}
96
97void
98update_live_out(idx_ctx& ctx, std::vector<IDSet>& live_out)
99{
100   for (IDSet& set : live_out) {
101      IDSet new_set;
102      for (uint32_t id : set)
103         new_set.insert(ctx.renames[id]);
104      set = new_set;
105   }
106}
107
108} /* end namespace */
109
110void
111reindex_ssa(Program* program)
112{
113   idx_ctx ctx;
114   reindex_program(ctx, program);
115
116   program->allocationID = program->temp_rc.size();
117}
118
119void
120reindex_ssa(Program* program, std::vector<IDSet>& live_out)
121{
122   idx_ctx ctx;
123   reindex_program(ctx, program);
124   update_live_out(ctx, live_out);
125
126   program->allocationID = program->temp_rc.size();
127}
128
129} // namespace aco
130