| 1 | /* Target-dependent costs for lower-subreg.cc. |
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| 2 | Copyright (C) 2012-2023 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 | #ifndef LOWER_SUBREG_H |
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| 21 | #define LOWER_SUBREG_H 1 |
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| 22 | |
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| 23 | /* Information about whether, and where, lower-subreg should be applied. */ |
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| 24 | struct lower_subreg_choices { |
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| 25 | /* A boolean vector for move splitting that is indexed by mode and is |
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| 26 | true for each mode that is to have its copies split. */ |
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| 27 | bool move_modes_to_split[MAX_MACHINE_MODE]; |
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| 28 | |
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| 29 | /* True if zero-extensions from word_mode to twice_word_mode should |
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| 30 | be split. */ |
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| 31 | bool splitting_zext; |
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| 32 | |
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| 33 | /* Index X is true if twice_word_mode shifts by X + BITS_PER_WORD |
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| 34 | should be split. */ |
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| 35 | bool splitting_ashift[MAX_BITS_PER_WORD]; |
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| 36 | bool splitting_lshiftrt[MAX_BITS_PER_WORD]; |
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| 37 | bool splitting_ashiftrt[MAX_BITS_PER_WORD]; |
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| 38 | |
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| 39 | /* True if there is at least one mode that is worth splitting. */ |
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| 40 | bool something_to_do; |
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| 41 | }; |
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| 42 | |
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| 43 | /* Target-specific information for the subreg lowering pass. */ |
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| 44 | struct target_lower_subreg { |
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| 45 | /* An integer mode that is twice as wide as word_mode. */ |
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| 46 | scalar_int_mode_pod x_twice_word_mode; |
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| 47 | |
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| 48 | /* What we have decided to do when optimizing for size (index 0) |
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| 49 | and speed (index 1). */ |
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| 50 | struct lower_subreg_choices x_choices[2]; |
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| 51 | }; |
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| 52 | |
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| 53 | extern struct target_lower_subreg default_target_lower_subreg; |
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| 54 | #if SWITCHABLE_TARGET |
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| 55 | extern struct target_lower_subreg *this_target_lower_subreg; |
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| 56 | #else |
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| 57 | #define this_target_lower_subreg (&default_target_lower_subreg) |
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| 58 | #endif |
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| 59 | |
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| 60 | #endif |
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| 61 | |
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