70 lines
2.7 KiB
C
70 lines
2.7 KiB
C
/* Definitions for condition code handling in final.cc and output routines.
|
|
Copyright (C) 1987-2023 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 */
|