| 1 | /* Definitions for condition code handling in final.cc and output routines. |
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| 2 | Copyright (C) 1987-2023 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 GCC_CONDITIONS_H |
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| 21 | #define GCC_CONDITIONS_H |
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| 22 | |
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| 23 | /* These are the machine-independent flags: */ |
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| 24 | |
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| 25 | /* Set if the sign of the cc value is inverted: |
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| 26 | output a following jump-if-less as a jump-if-greater, etc. */ |
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| 27 | #define CC_REVERSED 1 |
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| 28 | |
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| 29 | /* This bit means that the current setting of the N bit is bogus |
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| 30 | and conditional jumps should use the Z bit in its place. |
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| 31 | This state obtains when an extraction of a signed single-bit field |
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| 32 | or an arithmetic shift right of a byte by 7 bits |
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| 33 | is turned into a btst, because btst does not set the N bit. */ |
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| 34 | #define CC_NOT_POSITIVE 2 |
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| 35 | |
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| 36 | /* This bit means that the current setting of the N bit is bogus |
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| 37 | and conditional jumps should pretend that the N bit is clear. |
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| 38 | Used after extraction of an unsigned bit |
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| 39 | or logical shift right of a byte by 7 bits is turned into a btst. |
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| 40 | The btst does not alter the N bit, but the result of that shift |
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| 41 | or extract is never negative. */ |
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| 42 | #define CC_NOT_NEGATIVE 4 |
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| 43 | |
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| 44 | /* This bit means that the current setting of the overflow flag |
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| 45 | is bogus and conditional jumps should pretend there is no overflow. */ |
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| 46 | /* ??? Note that for most targets this macro is misnamed as it applies |
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| 47 | to the carry flag, not the overflow flag. */ |
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| 48 | #define CC_NO_OVERFLOW 010 |
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| 49 | |
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| 50 | /* This bit means that what ought to be in the Z bit |
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| 51 | should be tested as the complement of the N bit. */ |
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| 52 | #define CC_Z_IN_NOT_N 020 |
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| 53 | |
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| 54 | /* This bit means that what ought to be in the Z bit |
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| 55 | should be tested as the N bit. */ |
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| 56 | #define CC_Z_IN_N 040 |
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| 57 | |
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| 58 | /* Nonzero if we must invert the sense of the following branch, i.e. |
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| 59 | change EQ to NE. This is not safe for IEEE floating point operations! |
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| 60 | It is intended for use only when a combination of arithmetic |
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| 61 | or logical insns can leave the condition codes set in a fortuitous |
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| 62 | (though inverted) state. */ |
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| 63 | #define CC_INVERTED 0100 |
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| 64 | |
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| 65 | /* Nonzero if we must convert signed condition operators to unsigned. |
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| 66 | This is only used by machine description files. */ |
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| 67 | #define CC_NOT_SIGNED 0200 |
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| 68 | |
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| 69 | #endif /* GCC_CONDITIONS_H */ |
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| 70 | |
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