1/* Definitions of target machine for GNU compiler, for the pdp-11 2 Copyright (C) 2002-2020 Free Software Foundation, Inc. 3 Contributed by Michael K. Gschwind (mike@vlsivie.tuwien.ac.at). 4 5This file is part of GCC. 6 7GCC is free software; you can redistribute it and/or modify 8it under the terms of the GNU General Public License as published by 9the Free Software Foundation; either version 3, or (at your option) 10any later version. 11 12GCC is distributed in the hope that it will be useful, 13but WITHOUT ANY WARRANTY; without even the implied warranty of 14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15GNU General Public License for more details. 16 17You should have received a copy of the GNU General Public License 18along with GCC; see the file COPYING3. If not see 19<http://www.gnu.org/licenses/>. */ 20 21/* Add any extra modes needed to represent the condition code. 22 23 The default CCmode is the CPU condition codes, as set by compare; 24 all conditional branches are valid with this. 25 26 CCNZmode is the CPU condition code as a side effect of arithmetic 27 or logic operations where N and Z reflect sign and zero status of 28 the result, but the V bit is not meaningful. Unsigned conditional 29 branches don't apply then (no such thing when comparing with zero) 30 and signed branches that use V need to clear V first if they are to 31 be used. CCNZ mode appears in side effects (implicit compare with 32 zero) if V is not forced to 0 by the instruction. In such cases, V 33 often reflects signed overflow of the operation, which means a 34 signed branch will get the sign backwards. This applies both to 35 some float and integer operations. 36 37 These modes are used both in the FPU and the CPU, since they have 38 the same meaning, and also because the FPU condition codes are 39 copied to the CPU before being used in conditional branches. */ 40 41CC_MODE (CCNZ); 42 43RESET_FLOAT_FORMAT (SF, pdp11_f_format); 44RESET_FLOAT_FORMAT (DF, pdp11_d_format); 45