| /* Definitions of target machine for GNU compiler, for the pdp-11 |
| Copyright (C) 2002-2020 Free Software Foundation, Inc. |
| Contributed by Michael K. Gschwind (mike@vlsivie.tuwien.ac.at). |
| |
| 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/>. */ |
| |
| /* Add any extra modes needed to represent the condition code. |
| |
| The default CCmode is the CPU condition codes, as set by compare; |
| all conditional branches are valid with this. |
| |
| CCNZmode is the CPU condition code as a side effect of arithmetic |
| or logic operations where N and Z reflect sign and zero status of |
| the result, but the V bit is not meaningful. Unsigned conditional |
| branches don't apply then (no such thing when comparing with zero) |
| and signed branches that use V need to clear V first if they are to |
| be used. CCNZ mode appears in side effects (implicit compare with |
| zero) if V is not forced to 0 by the instruction. In such cases, V |
| often reflects signed overflow of the operation, which means a |
| signed branch will get the sign backwards. This applies both to |
| some float and integer operations. |
| |
| These modes are used both in the FPU and the CPU, since they have |
| the same meaning, and also because the FPU condition codes are |
| copied to the CPU before being used in conditional branches. */ |
| |
| CC_MODE (CCNZ); |
| |
| RESET_FLOAT_FORMAT (SF, pdp11_f_format); |
| RESET_FLOAT_FORMAT (DF, pdp11_d_format); |