2 * Copyright (C) 2018 Alyssa Rosenzweig
3 * Copyright (C) 2019 Collabora, Ltd.
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
12 * The above copyright notice and this permission notice (including the next
13 * paragraph) shall be included in all copies or substantial portions of the
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
26 #include "midgard_ops.h"
29 midgard_opt_copy_prop(compiler_context
*ctx
, midgard_block
*block
)
31 bool progress
= false;
33 mir_foreach_instr_in_block_safe(block
, ins
) {
34 if (ins
->type
!= TAG_ALU_4
) continue;
35 if (!OP_IS_MOVE(ins
->alu
.op
)) continue;
37 unsigned from
= ins
->ssa_args
.src1
;
38 unsigned to
= ins
->ssa_args
.dest
;
40 /* We only work on pure SSA */
42 if (to
>= SSA_FIXED_MINIMUM
) continue;
43 if (from
>= SSA_FIXED_MINIMUM
) continue;
44 if (to
>= ctx
->func
->impl
->ssa_alloc
) continue;
45 if (from
>= ctx
->func
->impl
->ssa_alloc
) continue;
47 /* Constant propagation is not handled here, either */
48 if (ins
->ssa_args
.inline_constant
) continue;
49 if (ins
->has_constants
) continue;
51 /* Modifier propagation is not handled here */
52 if (mir_nontrivial_source2_mod(ins
)) continue;
53 if (mir_nontrivial_outmod(ins
)) continue;
55 /* We're clear -- rewrite */
56 mir_rewrite_index_src(ctx
, to
, from
);
57 mir_remove_instruction(ins
);