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76beabf4 | 1 | /* Description of target passes for AVR. |
7adcbafe | 2 | Copyright (C) 2016-2022 Free Software Foundation, Inc. */ |
76beabf4 GJL |
3 | |
4 | /* This file is part of GCC. | |
5 | ||
6 | GCC is free software; you can redistribute it and/or modify it under | |
7 | the terms of the GNU General Public License as published by the Free | |
8 | Software Foundation; either version 3, or (at your option) any later | |
9 | version. | |
10 | ||
11 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
14 | for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GCC; see the file COPYING3. If not see | |
18 | <http://www.gnu.org/licenses/>. */ | |
19 | ||
63866e04 GJL |
20 | /* An analysis pass that runs prior to prologue / epilogue generation. |
21 | Computes cfun->machine->gasisr.maybe which is used in prologue and | |
22 | epilogue generation provided -mgas-isr-prologues is on. */ | |
23 | ||
24 | INSERT_PASS_BEFORE (pass_thread_prologue_and_epilogue, 1, avr_pass_pre_proep); | |
25 | ||
b6735d9a | 26 | /* This avr-specific pass (re)computes insn notes, in particular REG_DEAD |
e53b6e56 | 27 | notes which are used by `avr.cc::reg_unused_after' and branch offset |
b6735d9a GJL |
28 | computations. These notes must be correct, i.e. there must be no |
29 | dangling REG_DEAD notes; otherwise wrong code might result, cf. PR64331. | |
30 | ||
31 | DF needs (correct) CFG, hence right before free_cfg is the last | |
32 | opportunity to rectify notes. */ | |
33 | ||
34 | INSERT_PASS_BEFORE (pass_free_cfg, 1, avr_pass_recompute_notes); | |
35 | ||
078134e5 GJL |
36 | /* casesi uses a SImode switch index which is quite costly as most code will |
37 | work on HImode or QImode. The following pass runs right after .expand and | |
38 | tries to fix such situations by operating on the original mode. This | |
39 | reduces code size and register pressure. | |
40 | ||
41 | The assertion is that the code generated by casesi is unaltered and a | |
42 | a sign-extend or zero-extend from QImode or HImode precedes the casesi | |
43 | insns withaout any insns in between. */ | |
44 | ||
45 | INSERT_PASS_AFTER (pass_expand, 1, avr_pass_casesi); |