1  /* Definitions for condition code handling in final.cc and output routines.
       2     Copyright (C) 1987-2023 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 */