LXR linux/arch/microblaze/lib/muldi3.c

   1// SPDX-License-Identifier: GPL-2.0
   2#include <linux/export.h>
   3
   4#include "libgcc.h"
   5
   6#define W_TYPE_SIZE 32
   7
   8#define __ll_B ((unsigned long) 1 << (W_TYPE_SIZE / 2))
   9#define __ll_lowpart(t) ((unsigned long) (t) & (__ll_B - 1))
  10#define __ll_highpart(t) ((unsigned long) (t) >> (W_TYPE_SIZE / 2))
  11
  12/* If we still don't have umul_ppmm, define it using plain C.  */
  13#if !defined(umul_ppmm)
  14#define umul_ppmm(w1, w0, u, v)                                         \
  15        do {                                                            \
  16                unsigned long __x0, __x1, __x2, __x3;                   \
  17                unsigned short __ul, __vl, __uh, __vh;                  \
  18                                                                        \
  19                __ul = __ll_lowpart(u);                                 \
  20                __uh = __ll_highpart(u);                                \
  21                __vl = __ll_lowpart(v);                                 \
  22                __vh = __ll_highpart(v);                                \
  23                                                                        \
  24                __x0 = (unsigned long) __ul * __vl;                     \
  25                __x1 = (unsigned long) __ul * __vh;                     \
  26                __x2 = (unsigned long) __uh * __vl;                     \
  27                __x3 = (unsigned long) __uh * __vh;                     \
  28                                                                        \
  29                __x1 += __ll_highpart(__x0); /* this can't give carry */\
  30                __x1 += __x2; /* but this indeed can */                 \
  31                if (__x1 < __x2) /* did we get it? */                   \
  32                __x3 += __ll_B; /* yes, add it in the proper pos */     \
  33                                                                        \
  34                (w1) = __x3 + __ll_highpart(__x1);                      \
  35                (w0) = __ll_lowpart(__x1) * __ll_B + __ll_lowpart(__x0);\
  36        } while (0)
  37#endif
  38
  39#if !defined(__umulsidi3)
  40#define __umulsidi3(u, v) ({                            \
  41        DWunion __w;                                    \
  42        umul_ppmm(__w.s.high, __w.s.low, u, v);         \
  43        __w.ll;                                         \
  44        })
  45#endif
  46
  47long long __muldi3(long long u, long long v)
  48{
  49        const DWunion uu = {.ll = u};
  50        const DWunion vv = {.ll = v};
  51        DWunion w = {.ll = __umulsidi3(uu.s.low, vv.s.low)};
  52
  53        w.s.high += ((unsigned long) uu.s.low * (unsigned long) vv.s.high
  54                + (unsigned long) uu.s.high * (unsigned long) vv.s.low);
  55
  56        return w.ll;
  57}
  58EXPORT_SYMBOL(__muldi3);
  59