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Linux/arch/microblaze/lib/muldi3.c

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  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 
 47 long 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 }
 58 EXPORT_SYMBOL(__muldi3);
 59 

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