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Linux/lib/muldi3.c

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Diff markup

Differences between /lib/muldi3.c (Version linux-6.12-rc7) and /lib/muldi3.c (Version linux-5.8.18)


  1 // SPDX-License-Identifier: GPL-2.0-or-later        1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*                                                  2 /*
  3  */                                                 3  */
  4                                                     4 
  5 #include <linux/export.h>                           5 #include <linux/export.h>
  6 #include <linux/libgcc.h>                           6 #include <linux/libgcc.h>
  7                                                     7 
  8 #define W_TYPE_SIZE 32                              8 #define W_TYPE_SIZE 32
  9                                                     9 
 10 #define __ll_B ((unsigned long) 1 << (W_TYPE_S     10 #define __ll_B ((unsigned long) 1 << (W_TYPE_SIZE / 2))
 11 #define __ll_lowpart(t) ((unsigned long) (t) &     11 #define __ll_lowpart(t) ((unsigned long) (t) & (__ll_B - 1))
 12 #define __ll_highpart(t) ((unsigned long) (t)      12 #define __ll_highpart(t) ((unsigned long) (t) >> (W_TYPE_SIZE / 2))
 13                                                    13 
 14 /* If we still don't have umul_ppmm, define it     14 /* If we still don't have umul_ppmm, define it using plain C.  */
 15 #if !defined(umul_ppmm)                            15 #if !defined(umul_ppmm)
 16 #define umul_ppmm(w1, w0, u, v)                    16 #define umul_ppmm(w1, w0, u, v)                                         \
 17         do {                                       17         do {                                                            \
 18                 unsigned long __x0, __x1, __x2     18                 unsigned long __x0, __x1, __x2, __x3;                   \
 19                 unsigned short __ul, __vl, __u     19                 unsigned short __ul, __vl, __uh, __vh;                  \
 20                                                    20                                                                         \
 21                 __ul = __ll_lowpart(u);            21                 __ul = __ll_lowpart(u);                                 \
 22                 __uh = __ll_highpart(u);           22                 __uh = __ll_highpart(u);                                \
 23                 __vl = __ll_lowpart(v);            23                 __vl = __ll_lowpart(v);                                 \
 24                 __vh = __ll_highpart(v);           24                 __vh = __ll_highpart(v);                                \
 25                                                    25                                                                         \
 26                 __x0 = (unsigned long) __ul *      26                 __x0 = (unsigned long) __ul * __vl;                     \
 27                 __x1 = (unsigned long) __ul *      27                 __x1 = (unsigned long) __ul * __vh;                     \
 28                 __x2 = (unsigned long) __uh *      28                 __x2 = (unsigned long) __uh * __vl;                     \
 29                 __x3 = (unsigned long) __uh *      29                 __x3 = (unsigned long) __uh * __vh;                     \
 30                                                    30                                                                         \
 31                 __x1 += __ll_highpart(__x0); /     31                 __x1 += __ll_highpart(__x0); /* this can't give carry */\
 32                 __x1 += __x2; /* but this inde     32                 __x1 += __x2; /* but this indeed can */                 \
 33                 if (__x1 < __x2) /* did we get     33                 if (__x1 < __x2) /* did we get it? */                   \
 34                 __x3 += __ll_B; /* yes, add it     34                 __x3 += __ll_B; /* yes, add it in the proper pos */     \
 35                                                    35                                                                         \
 36                 (w1) = __x3 + __ll_highpart(__     36                 (w1) = __x3 + __ll_highpart(__x1);                      \
 37                 (w0) = __ll_lowpart(__x1) * __     37                 (w0) = __ll_lowpart(__x1) * __ll_B + __ll_lowpart(__x0);\
 38         } while (0)                                38         } while (0)
 39 #endif                                             39 #endif
 40                                                    40 
 41 #if !defined(__umulsidi3)                          41 #if !defined(__umulsidi3)
 42 #define __umulsidi3(u, v) ({                       42 #define __umulsidi3(u, v) ({                            \
 43         DWunion __w;                               43         DWunion __w;                                    \
 44         umul_ppmm(__w.s.high, __w.s.low, u, v)     44         umul_ppmm(__w.s.high, __w.s.low, u, v);         \
 45         __w.ll;                                    45         __w.ll;                                         \
 46         })                                         46         })
 47 #endif                                             47 #endif
 48                                                    48 
 49 long long notrace __muldi3(long long u, long l     49 long long notrace __muldi3(long long u, long long v)
 50 {                                                  50 {
 51         const DWunion uu = {.ll = u};              51         const DWunion uu = {.ll = u};
 52         const DWunion vv = {.ll = v};              52         const DWunion vv = {.ll = v};
 53         DWunion w = {.ll = __umulsidi3(uu.s.lo     53         DWunion w = {.ll = __umulsidi3(uu.s.low, vv.s.low)};
 54                                                    54 
 55         w.s.high += ((unsigned long) uu.s.low      55         w.s.high += ((unsigned long) uu.s.low * (unsigned long) vv.s.high
 56                 + (unsigned long) uu.s.high *      56                 + (unsigned long) uu.s.high * (unsigned long) vv.s.low);
 57                                                    57 
 58         return w.ll;                               58         return w.ll;
 59 }                                                  59 }
 60 EXPORT_SYMBOL(__muldi3);                           60 EXPORT_SYMBOL(__muldi3);
 61                                                    61 

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