LXR linux/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
   9long 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}
  32EXPORT_SYMBOL(__ashldi3);
  33