LXR uboot/arch/m68k/lib/muldi3.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * muldi3.c extracted from gcc-2.7.2.3/libgcc2.c and
   4 *                         gcc-2.7.2.3/longlong.h
   5 *
   6 * Copyright (C) 1989, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
   7 */
   8
   9#define SI_TYPE_SIZE 32
  10#define __BITS4 (SI_TYPE_SIZE / 4)
  11#define __ll_B (1L << (SI_TYPE_SIZE / 2))
  12#define __ll_lowpart(t) ((USItype) (t) % __ll_B)
  13#define __ll_highpart(t) ((USItype) (t) / __ll_B)
  14
  15#define umul_ppmm(w1, w0, u, v)                                         \
  16  do {                                                                  \
  17    USItype __x0, __x1, __x2, __x3;                                     \
  18    USItype __ul, __vl, __uh, __vh;                                     \
  19                                                                        \
  20    __ul = __ll_lowpart (u);                                            \
  21    __uh = __ll_highpart (u);                                           \
  22    __vl = __ll_lowpart (v);                                            \
  23    __vh = __ll_highpart (v);                                           \
  24                                                                        \
  25    __x0 = (USItype) __ul * __vl;                                       \
  26    __x1 = (USItype) __ul * __vh;                                       \
  27    __x2 = (USItype) __uh * __vl;                                       \
  28    __x3 = (USItype) __uh * __vh;                                       \
  29                                                                        \
  30    __x1 += __ll_highpart (__x0);/* this can't give carry */            \
  31    __x1 += __x2;               /* but this indeed can */               \
  32    if (__x1 < __x2)            /* did we get it? */                    \
  33      __x3 += __ll_B;           /* yes, add it in the proper pos. */    \
  34                                                                        \
  35    (w1) = __x3 + __ll_highpart (__x1);                                 \
  36    (w0) = __ll_lowpart (__x1) * __ll_B + __ll_lowpart (__x0);          \
  37  } while (0)
  38
  39#define __umulsidi3(u, v) \
  40  ({DIunion __w;                                                        \
  41    umul_ppmm (__w.s.high, __w.s.low, u, v);                            \
  42    __w.ll; })
  43
  44typedef          int SItype     __attribute__ ((mode (SI)));
  45typedef unsigned int USItype    __attribute__ ((mode (SI)));
  46typedef          int DItype     __attribute__ ((mode (DI)));
  47typedef int word_type __attribute__ ((mode (__word__)));
  48
  49struct DIstruct {SItype high, low;};
  50
  51typedef union
  52{
  53        struct DIstruct s;
  54        DItype ll;
  55} DIunion;
  56
  57DItype __muldi3 (DItype u, DItype v)
  58{
  59        DIunion w;
  60        DIunion uu, vv;
  61
  62        uu.ll = u,
  63        vv.ll = v;
  64
  65        w.ll = __umulsidi3 (uu.s.low, vv.s.low);
  66        w.s.high += ((USItype) uu.s.low * (USItype) vv.s.high
  67                + (USItype) uu.s.high * (USItype) vv.s.low);
  68
  69        return w.ll;
  70}
  71