arch/microblaze/lib/muldi3.c

   1 #include <linux/module.h>
   2
   3 #include "libgcc.h"
   4
   5 #define DWtype long long
   6 #define UWtype unsigned long
   7 #define UHWtype unsigned short
   8
   9 #define W_TYPE_SIZE 32
  10
  11 #define __ll_B ((UWtype) 1 << (W_TYPE_SIZE / 2))
  12 #define __ll_lowpart(t) ((UWtype) (t) & (__ll_B - 1))
  13 #define __ll_highpart(t) ((UWtype) (t) >> (W_TYPE_SIZE / 2))
  14
  15 /* If we still don't have umul_ppmm, define it using plain C.  */
  16 #if !defined(umul_ppmm)
  17 #define umul_ppmm(w1, w0, u, v)                                         \
  18         do {                                                            \
  19                 UWtype __x0, __x1, __x2, __x3;                          \
  20                 UHWtype __ul, __vl, __uh, __vh;                         \
  21                                                                         \
  22                 __ul = __ll_lowpart(u);                                 \
  23                 __uh = __ll_highpart(u);                                \
  24                 __vl = __ll_lowpart(v);                                 \
  25                 __vh = __ll_highpart(v);                                \
  26                                                                         \
  27                 __x0 = (UWtype) __ul * __vl;                            \
  28                 __x1 = (UWtype) __ul * __vh;                            \
  29                 __x2 = (UWtype) __uh * __vl;                            \
  30                 __x3 = (UWtype) __uh * __vh;                            \
  31                                                                         \
  32                 __x1 += __ll_highpart(__x0); /* this can't give carry */\
  33                 __x1 += __x2; /* but this indeed can */                 \
  34                 if (__x1 < __x2) /* did we get it? */                   \
  35                 __x3 += __ll_B; /* yes, add it in the proper pos */     \
  36                                                                         \
  37                 (w1) = __x3 + __ll_highpart(__x1);                      \
  38                 (w0) = __ll_lowpart(__x1) * __ll_B + __ll_lowpart(__x0);\
  39         } while (0)
  40 #endif
  41
  42 #if !defined(__umulsidi3)
  43 #define __umulsidi3(u, v) ({                            \
  44         DWunion __w;                                    \
  45         umul_ppmm(__w.s.high, __w.s.low, u, v);         \
  46         __w.ll;                                         \
  47         })
  48 #endif
  49
  50 DWtype __muldi3(DWtype u, DWtype v)
  51 {
  52         const DWunion uu = {.ll = u};
  53         const DWunion vv = {.ll = v};
  54         DWunion w = {.ll = __umulsidi3(uu.s.low, vv.s.low)};
  55
  56         w.s.high += ((UWtype) uu.s.low * (UWtype) vv.s.high
  57                 + (UWtype) uu.s.high * (UWtype) vv.s.low);
  58
  59         return w.ll;
  60 }
  61 EXPORT_SYMBOL(__muldi3);