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Linux/lib/lshrdi3.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  * lib/lshrdi3.c
  4  */
  5 
  6 #include <linux/module.h>
  7 #include <linux/libgcc.h>
  8 
  9 long long notrace __lshrdi3(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.high = 0;
 22                 w.s.low = (unsigned int) uu.s.high >> -bm;
 23         } else {
 24                 const unsigned int carries = (unsigned int) uu.s.high << bm;
 25 
 26                 w.s.high = (unsigned int) uu.s.high >> b;
 27                 w.s.low = ((unsigned int) uu.s.low >> b) | carries;
 28         }
 29 
 30         return w.ll;
 31 }
 32 EXPORT_SYMBOL(__lshrdi3);
 33 

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