1 /* Definitions for condition code handling in final.c and output routines. 2 Copyright (C) 1987-2021 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 #ifndef GCC_CONDITIONS_H 21 #define GCC_CONDITIONS_H 22 23 /* These are the machine-independent flags: */ 24 25 /* Set if the sign of the cc value is inverted: 26 output a following jump-if-less as a jump-if-greater, etc. */ 27 #define CC_REVERSED 1 28 29 /* This bit means that the current setting of the N bit is bogus 30 and conditional jumps should use the Z bit in its place. 31 This state obtains when an extraction of a signed single-bit field 32 or an arithmetic shift right of a byte by 7 bits 33 is turned into a btst, because btst does not set the N bit. */ 34 #define CC_NOT_POSITIVE 2 35 36 /* This bit means that the current setting of the N bit is bogus 37 and conditional jumps should pretend that the N bit is clear. 38 Used after extraction of an unsigned bit 39 or logical shift right of a byte by 7 bits is turned into a btst. 40 The btst does not alter the N bit, but the result of that shift 41 or extract is never negative. */ 42 #define CC_NOT_NEGATIVE 4 43 44 /* This bit means that the current setting of the overflow flag 45 is bogus and conditional jumps should pretend there is no overflow. */ 46 /* ??? Note that for most targets this macro is misnamed as it applies 47 to the carry flag, not the overflow flag. */ 48 #define CC_NO_OVERFLOW 010 49 50 /* This bit means that what ought to be in the Z bit 51 should be tested as the complement of the N bit. */ 52 #define CC_Z_IN_NOT_N 020 53 54 /* This bit means that what ought to be in the Z bit 55 should be tested as the N bit. */ 56 #define CC_Z_IN_N 040 57 58 /* Nonzero if we must invert the sense of the following branch, i.e. 59 change EQ to NE. This is not safe for IEEE floating point operations! 60 It is intended for use only when a combination of arithmetic 61 or logical insns can leave the condition codes set in a fortuitous 62 (though inverted) state. */ 63 #define CC_INVERTED 0100 64 65 /* Nonzero if we must convert signed condition operators to unsigned. 66 This is only used by machine description files. */ 67 #define CC_NOT_SIGNED 0200 68 69 #endif /* GCC_CONDITIONS_H */ 70