lib/ashldi3.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  */
   4
   5 #include <linux/export.h>
   6
   7 #include <linux/libgcc.h>
   8
   9 long long notrace __ashldi3(long long u, word_type b)
  10 {
  11         DWunion uu, w;
  12         word_type bm;
  13
  14         if (b == 0)
  15                 return u;
  16
  17         uu.ll = u;
  18         bm = 32 - b;
  19
  20         if (bm <= 0) {
  21                 w.s.low = 0;
  22                 w.s.high = (unsigned int) uu.s.low << -bm;
  23         } else {
  24                 const unsigned int carries = (unsigned int) uu.s.low >> bm;
  25
  26                 w.s.low = (unsigned int) uu.s.low << b;
  27                 w.s.high = ((unsigned int) uu.s.high << b) | carries;
  28         }
  29
  30         return w.ll;
  31 }
  32 EXPORT_SYMBOL(__ashldi3);