1/* Description of target passes for AVR. 2 Copyright (C) 2016-2017 Free Software Foundation, Inc. */ 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 20/* FIXME: We have to add the last pass first, otherwise 21 gen-pass-instances.awk won't work as expected. */ 22 23/* This avr-specific pass (re)computes insn notes, in particular REG_DEAD 24 notes which are used by `avr.c::reg_unused_after' and branch offset 25 computations. These notes must be correct, i.e. there must be no 26 dangling REG_DEAD notes; otherwise wrong code might result, cf. PR64331. 27 28 DF needs (correct) CFG, hence right before free_cfg is the last 29 opportunity to rectify notes. */ 30 31INSERT_PASS_BEFORE (pass_free_cfg, 1, avr_pass_recompute_notes); 32 33/* casesi uses a SImode switch index which is quite costly as most code will 34 work on HImode or QImode. The following pass runs right after .expand and 35 tries to fix such situations by operating on the original mode. This 36 reduces code size and register pressure. 37 38 The assertion is that the code generated by casesi is unaltered and a 39 a sign-extend or zero-extend from QImode or HImode precedes the casesi 40 insns withaout any insns in between. */ 41 42INSERT_PASS_AFTER (pass_expand, 1, avr_pass_casesi); 43