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Annotation of gcc/config/isi.h, revision 1.1

1.1     ! root        1: /* Definitions of target machine for GNU compiler.  ISI 68000/68020 version.
        !             2:    Intended only for use with GAS, and not ISI's assembler, which is buggy
        !             3:    Copyright (C) 1988 Free Software Foundation, Inc.
        !             4: 
        !             5: This file is part of GNU CC.
        !             6: 
        !             7: GNU CC is free software; you can redistribute it and/or modify
        !             8: it under the terms of the GNU General Public License as published by
        !             9: the Free Software Foundation; either version 2, or (at your option)
        !            10: any later version.
        !            11: 
        !            12: GNU CC is distributed in the hope that it will be useful,
        !            13: but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            14: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            15: GNU General Public License for more details.
        !            16: 
        !            17: You should have received a copy of the GNU General Public License
        !            18: along with GNU CC; see the file COPYING.  If not, write to
        !            19: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
        !            20: 
        !            21: #include "m68k.h"
        !            22: 
        !            23: /* Without STRUCTURE_SIZE_BOUNDARY, we can't ensure that structures are
        !            24:    aligned such that we can correctly extract bitfields from them.
        !            25:    Someone should check whether the usual compiler on this machine
        !            26:    provides the equivalent behavior of STRUCTURE_SIZE_BOUNDARY.  */
        !            27: /* Alternative solutions are (1) define PCC_BITFIELD_TYPE_MATTERS,
        !            28:    if that fits what the usual compiler does,
        !            29:    or disable the -m68000 and -mnobitfield options.  */
        !            30: #error This doesn't define STRUCTURE_SIZE_BOUNDARY
        !            31: 
        !            32: /* See m68k.h.  7 means 68020 with 68881. */
        !            33: 
        !            34: #ifndef TARGET_DEFAULT
        !            35: #define TARGET_DEFAULT 7
        !            36: #endif
        !            37: 
        !            38: #if TARGET_DEFAULT & 2
        !            39: /* Define __HAVE_68881__ in preprocessor, unless -msoft-float is specified.
        !            40:    This will control the use of inline 68881 insns in certain macros.  */
        !            41: 
        !            42: #define CPP_SPEC "%{!msoft-float:-D__HAVE_68881__}"
        !            43: 
        !            44: /* If the 68881 is used, link must load libmc.a instead of libc.a */
        !            45: 
        !            46: #define LIB_SPEC "%{g:-lg} %{msoft-float:%{!p:%{!pg:-lc}}%{p:-lc_p}%{pg:-lc_p}}%{!msoft-float:%{!p:%{!pg:-lmc}}%{p:-lmc_p}%{pg:-lmc_p}} %{g:-lg}"
        !            47: 
        !            48: #else
        !            49: /* Define __HAVE_68881__ in preprocessor if -m68881 is specified.
        !            50:    This will control the use of inline 68881 insns in certain macros.  */
        !            51: 
        !            52: #define CPP_SPEC "%{m68881:-D__HAVE_68881__}"
        !            53: 
        !            54: /* If the 68881 is used, link must load libmc.a instead of libc.a */
        !            55: 
        !            56: #define LIB_SPEC "%{g:-lg} %{!m68881:%{!p:%{!pg:-lc}}%{p:-lc_p}%{pg:-lc_p}}%{m68881:%{!p:%{!pg:-lmc}}%{p:-lmc_p}%{pg:-lmc_p}}"
        !            57: #endif
        !            58: 
        !            59: /* Names to predefine in the preprocessor for this target machine.  */
        !            60: 
        !            61: #define CPP_PREDEFINES "-Dunix -Dmc68000 -Dis68k"
        !            62: 
        !            63: /* This is BSD, so it wants DBX format.  */
        !            64: 
        !            65: #define DBX_DEBUGGING_INFO
        !            66: 
        !            67: /* Override parts of m68k.h to fit the ISI 68k machine.  */
        !            68: 
        !            69: #undef FUNCTION_VALUE
        !            70: #undef LIBCALL_VALUE
        !            71: #undef FUNCTION_VALUE_REGNO_P
        !            72: #undef ASM_FILE_START
        !            73: 
        !            74: /* If TARGET_68881, return SF and DF values in f0 instead of d0.  */
        !            75: 
        !            76: #define FUNCTION_VALUE(VALTYPE,FUNC) LIBCALL_VALUE (TYPE_MODE (VALTYPE))
        !            77: 
        !            78: #define LIBCALL_VALUE(MODE) \
        !            79:  gen_rtx (REG, (MODE), ((TARGET_68881 && ((MODE) == SFmode || (MODE) == DFmode)) ? 16 : 0))
        !            80: 
        !            81: /* 1 if N is a possible register number for a function value.
        !            82:    D0 may be used, and F0 as well if -m68881 is specified.  */
        !            83: 
        !            84: #define FUNCTION_VALUE_REGNO_P(N) \
        !            85:  ((N) == 0 || (TARGET_68881 && (N) == 16))
        !            86: 
        !            87: /* Also output something to cause the correct _doprnt to be loaded.  */
        !            88: #define ASM_FILE_START(FILE) fprintf (FILE, "#NO_APP\n%s\n", TARGET_68881 ? ".globl fltused" : "")

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