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comparison gcc/config/avr/avr-passes.def @ 111:04ced10e8804

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gcc 7
author kono
date Fri, 27 Oct 2017 22:46:09 +0900
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children 84e7813d76e9
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68:561a7518be6b 111:04ced10e8804
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 /* 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
26 /* This avr-specific pass (re)computes insn notes, in particular REG_DEAD
27 notes which are used by `avr.c::reg_unused_after' and branch offset
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
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);