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

   1/*
   2 * muldi3.c extracted from gcc-2.7.2.3/libgcc2.c and
   3 *                         gcc-2.7.2.3/longlong.h
   4 *
   5 * Copyright (C) 1989, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
   6 *
   7 * SPDX-License-Identifier:     GPL-2.0+
   8 */
   9
  10#define SI_TYPE_SIZE 32
  11#define __BITS4 (SI_TYPE_SIZE / 4)
  12#define __ll_B (1L << (SI_TYPE_SIZE / 2))
  13#define __ll_lowpart(t) ((USItype) (t) % __ll_B)
  14#define __ll_highpart(t) ((USItype) (t) / __ll_B)
  15
  16#define umul_ppmm(w1, w0, u, v)                                         \
  17  do {                                                                  \
  18    USItype __x0, __x1, __x2, __x3;                                     \
  19    USItype __ul, __vl, __uh, __vh;                                     \
  20                                                                        \
  21    __ul = __ll_lowpart (u);                                            \
  22    __uh = __ll_highpart (u);                                           \
  23    __vl = __ll_lowpart (v);                                            \
  24    __vh = __ll_highpart (v);                                           \
  25                                                                        \
  26    __x0 = (USItype) __ul * __vl;                                       \
  27    __x1 = (USItype) __ul * __vh;                                       \
  28    __x2 = (USItype) __uh * __vl;                                       \
  29    __x3 = (USItype) __uh * __vh;                                       \
  30                                                                        \
  31    __x1 += __ll_highpart (__x0);/* this can't give carry */            \
  32    __x1 += __x2;               /* but this indeed can */               \
  33    if (__x1 < __x2)            /* did we get it? */                    \
  34      __x3 += __ll_B;           /* yes, add it in the proper pos. */    \
  35                                                                        \
  36    (w1) = __x3 + __ll_highpart (__x1);                                 \
  37    (w0) = __ll_lowpart (__x1) * __ll_B + __ll_lowpart (__x0);          \
  38  } while (0)
  39
  40#define __umulsidi3(u, v) \
  41  ({DIunion __w;                                                        \
  42    umul_ppmm (__w.s.high, __w.s.low, u, v);                            \
  43    __w.ll; })
  44
  45typedef          int SItype     __attribute__ ((mode (SI)));
  46typedef unsigned int USItype    __attribute__ ((mode (SI)));
  47typedef          int DItype     __attribute__ ((mode (DI)));
  48typedef int word_type __attribute__ ((mode (__word__)));
  49
  50struct DIstruct {SItype high, low;};
  51
  52typedef union
  53{
  54        struct DIstruct s;
  55        DItype ll;
  56} DIunion;
  57
  58DItype __muldi3 (DItype u, DItype v)
  59{
  60        DIunion w;
  61        DIunion uu, vv;
  62
  63        uu.ll = u,
  64        vv.ll = v;
  65
  66        w.ll = __umulsidi3 (uu.s.low, vv.s.low);
  67        w.s.high += ((USItype) uu.s.low * (USItype) vv.s.high
  68                + (USItype) uu.s.high * (USItype) vv.s.low);
  69
  70        return w.ll;
  71}
  72