[thirdparty/gcc.git] / gcc / conditions.h

/* Definitions for condition code handling in final.cc and output routines.
   Copyright (C) 1987-2024 Free Software Foundation, Inc.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.

GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>.  */

#ifndef GCC_CONDITIONS_H
#define GCC_CONDITIONS_H

/* These are the machine-independent flags:  */

/* Set if the sign of the cc value is inverted:
   output a following jump-if-less as a jump-if-greater, etc.  */
#define CC_REVERSED 1

/* This bit means that the current setting of the N bit is bogus
   and conditional jumps should use the Z bit in its place.
   This state obtains when an extraction of a signed single-bit field
   or an arithmetic shift right of a byte by 7 bits
   is turned into a btst, because btst does not set the N bit.  */
#define CC_NOT_POSITIVE 2

/* This bit means that the current setting of the N bit is bogus
   and conditional jumps should pretend that the N bit is clear.
   Used after extraction of an unsigned bit
   or logical shift right of a byte by 7 bits is turned into a btst.
   The btst does not alter the N bit, but the result of that shift
   or extract is never negative.  */
#define CC_NOT_NEGATIVE 4

/* This bit means that the current setting of the overflow flag
   is bogus and conditional jumps should pretend there is no overflow.  */
/* ??? Note that for most targets this macro is misnamed as it applies
   to the carry flag, not the overflow flag.  */
#define CC_NO_OVERFLOW 010

/* This bit means that what ought to be in the Z bit
   should be tested as the complement of the N bit.  */
#define CC_Z_IN_NOT_N 020

/* This bit means that what ought to be in the Z bit
   should be tested as the N bit.  */
#define CC_Z_IN_N 040

/* Nonzero if we must invert the sense of the following branch, i.e.
   change EQ to NE.  This is not safe for IEEE floating point operations!
   It is intended for use only when a combination of arithmetic
   or logical insns can leave the condition codes set in a fortuitous
   (though inverted) state.  */
#define CC_INVERTED 0100

/* Nonzero if we must convert signed condition operators to unsigned.
   This is only used by machine description files.  */
#define CC_NOT_SIGNED 0200

#endif /* GCC_CONDITIONS_H */
Commit	Line	Data
e53b6e56	1	/* Definitions for condition code handling in final.cc and output routines.
a945c346	2	Copyright (C) 1987-2024 Free Software Foundation, Inc.
bf55c04f	3
1322177d	4	This file is part of GCC.
bf55c04f	5
1322177d LB	6	GCC is free software; you can redistribute it and/or modify it under
1322177d LB	7	the terms of the GNU General Public License as published by the Free
9dcd6f09	8	Software Foundation; either version 3, or (at your option) any later
1322177d	9	version.
bf55c04f	10
1322177d LB	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.
bf55c04f CH	15
bf55c04f CH	16	You should have received a copy of the GNU General Public License
9dcd6f09 NC	17	along with GCC; see the file COPYING3. If not see
9dcd6f09 NC	18	<http://www.gnu.org/licenses/>. */
bf55c04f	19
f1717f8d KC	20	#ifndef GCC_CONDITIONS_H
	21	#define GCC_CONDITIONS_H
	22
bf55c04f CH	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. */
d7083c81 DE	46	/* ??? Note that for most targets this macro is misnamed as it applies
d7083c81 DE	47	to the carry flag, not the overflow flag. */
bf55c04f CH	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
e8a2790c	65	/* Nonzero if we must convert signed condition operators to unsigned.
19eb1ad7	66	This is only used by machine description files. */
e8a2790c JVA	67	#define CC_NOT_SIGNED 0200
e8a2790c JVA	68
f1717f8d	69	#endif /* GCC_CONDITIONS_H */