libgcc/config/msp430/lib2divSI.c

   1 /* SI mode divide routines for libgcc for MSP430
   2    Copyright (C) 2012-2021 Free Software Foundation, Inc.
   3    Contributed by Red Hat.
   4
   5    This file is part of GCC.
   6
   7    GCC is free software; you can redistribute it and/or modify it
   8    under the terms of the GNU General Public License as published
   9    by the Free Software Foundation; either version 3, or (at your
  10    option) any later version.
  11
  12    GCC is distributed in the hope that it will be useful, but WITHOUT
  13    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  15    License for more details.
  16
  17    Under Section 7 of GPL version 3, you are granted additional
  18    permissions described in the GCC Runtime Library Exception, version
  19    3.1, as published by the Free Software Foundation.
  20
  21    You should have received a copy of the GNU General Public License and
  22    a copy of the GCC Runtime Library Exception along with this program;
  23    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  24    <http://www.gnu.org/licenses/>.  */
  25
  26 typedef          int  sint32_type   __attribute__ ((mode (SI)));
  27 typedef unsigned int  uint32_type   __attribute__ ((mode (SI)));
  28 typedef          int  sint16_type   __attribute__ ((mode (HI)));
  29 typedef unsigned int  uint16_type   __attribute__ ((mode (HI)));
  30 typedef          int  sint08_type   __attribute__ ((mode (QI)));
  31 typedef unsigned int  uint08_type   __attribute__ ((mode (QI)));
  32 typedef int           word_type     __attribute__ ((mode (__word__)));
  33
  34 #define C3B(a,b,c) a##b##c
  35 #define C3(a,b,c) C3B(a,b,c)
  36
  37 #define UINT_TYPE       uint32_type
  38 #define SINT_TYPE       sint32_type
  39 #define BITS_MINUS_1    31
  40 #define NAME_MODE       si
  41
  42 #include "msp430-divmod.h"
  43
  44 /* ---------------------------------------------------------------------*/
  45
  46 /* There is a typo in the MSP430 ABI document.  It calls the unsigned
  47    long integer division function __mspabi_divlu when it should be
  48    __mspabi_divul.  Likewise the unsigned long long integer division
  49    function is called __mspabi_divllu when it should be __mspabi_divull.
  50
  51    Earlier versions of this toolchain used generate the ABI compliant
  52    names, so in order to support object files built with those tools
  53    we provide stub functions that call the correct routines.  */
  54
  55 asm (".global __mspabi_divlu\n\
  56          .set __mspabi_divlu, __mspabi_divul");
  57
  58 /* We cannot use the same trick for __mspabi_divllu as that is defined
  59    in a different file.  Instead we create a stub here.  The cost of
  60    executing the branch instruction will be trivial compared to the
  61    cost of executing a long long division.  */
  62
  63 #ifdef __MSP430X_LARGE__
  64 asm (".global __mspabi_divllu\n\
  65       __mspabi_divllu:\n\
  66            BRA #__mspabi_divull");
  67 #else
  68 asm (".global __mspabi_divllu\n\
  69       __mspabi_divllu:\n\
  70            BR #__mspabi_divull");
  71 #endif