| /* Description of target passes for AVR. |
| Copyright (C) 2016-2022 Free Software Foundation, Inc. */ |
| |
| /* This file is part of GCC. |
| |
| GCC is free software; you can redistribute it and/or modify it under |
| the terms of the GNU General Public License as published by the Free |
| Software Foundation; either version 3, or (at your option) any later |
| version. |
| |
| GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
| WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GCC; see the file COPYING3. If not see |
| <http://www.gnu.org/licenses/>. */ |
| |
| /* An analysis pass that runs prior to prologue / epilogue generation. |
| Computes cfun->machine->gasisr.maybe which is used in prologue and |
| epilogue generation provided -mgas-isr-prologues is on. */ |
| |
| INSERT_PASS_BEFORE (pass_thread_prologue_and_epilogue, 1, avr_pass_pre_proep); |
| |
| /* This avr-specific pass (re)computes insn notes, in particular REG_DEAD |
| notes which are used by `avr.cc::reg_unused_after' and branch offset |
| computations. These notes must be correct, i.e. there must be no |
| dangling REG_DEAD notes; otherwise wrong code might result, cf. PR64331. |
| |
| DF needs (correct) CFG, hence right before free_cfg is the last |
| opportunity to rectify notes. */ |
| |
| INSERT_PASS_BEFORE (pass_free_cfg, 1, avr_pass_recompute_notes); |
| |
| /* casesi uses a SImode switch index which is quite costly as most code will |
| work on HImode or QImode. The following pass runs right after .expand and |
| tries to fix such situations by operating on the original mode. This |
| reduces code size and register pressure. |
| |
| The assertion is that the code generated by casesi is unaltered and a |
| a sign-extend or zero-extend from QImode or HImode precedes the casesi |
| insns withaout any insns in between. */ |
| |
| INSERT_PASS_AFTER (pass_expand, 1, avr_pass_casesi); |