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1 /* Description of target passes for AVR.
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145
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2 Copyright (C) 2016-2020 Free Software Foundation, Inc. */
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3
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4 /* This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify it under
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7 the terms of the GNU General Public License as published by the Free
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8 Software Foundation; either version 3, or (at your option) any later
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9 version.
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10
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11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with GCC; see the file COPYING3. If not see
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18 <http://www.gnu.org/licenses/>. */
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19
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20 /* An analysis pass that runs prior to prologue / epilogue generation.
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21 Computes cfun->machine->gasisr.maybe which is used in prologue and
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22 epilogue generation provided -mgas-isr-prologues is on. */
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23
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24 INSERT_PASS_BEFORE (pass_thread_prologue_and_epilogue, 1, avr_pass_pre_proep);
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25
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26 /* This avr-specific pass (re)computes insn notes, in particular REG_DEAD
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27 notes which are used by `avr.c::reg_unused_after' and branch offset
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28 computations. These notes must be correct, i.e. there must be no
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29 dangling REG_DEAD notes; otherwise wrong code might result, cf. PR64331.
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30
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31 DF needs (correct) CFG, hence right before free_cfg is the last
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32 opportunity to rectify notes. */
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33
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34 INSERT_PASS_BEFORE (pass_free_cfg, 1, avr_pass_recompute_notes);
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35
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36 /* casesi uses a SImode switch index which is quite costly as most code will
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37 work on HImode or QImode. The following pass runs right after .expand and
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38 tries to fix such situations by operating on the original mode. This
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39 reduces code size and register pressure.
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40
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41 The assertion is that the code generated by casesi is unaltered and a
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42 a sign-extend or zero-extend from QImode or HImode precedes the casesi
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43 insns withaout any insns in between. */
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44
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45 INSERT_PASS_AFTER (pass_expand, 1, avr_pass_casesi);
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