LXR linux/arch/blackfin/lib/ashrdi3.c

   1/*
   2 * Copyright 2004-2009 Analog Devices Inc.
   3 *
   4 * Licensed under the GPL-2 or later.
   5 */
   6
   7#include "gcclib.h"
   8
   9#ifdef CONFIG_ARITHMETIC_OPS_L1
  10DItype __ashrdi3(DItype u, word_type b)__attribute__((l1_text));
  11#endif
  12
  13DItype __ashrdi3(DItype u, word_type b)
  14{
  15        DIunion w;
  16        word_type bm;
  17        DIunion uu;
  18
  19        if (b == 0)
  20                return u;
  21
  22        uu.ll = u;
  23
  24        bm = (sizeof(SItype) * BITS_PER_UNIT) - b;
  25        if (bm <= 0) {
  26                /* w.s.high = 1..1 or 0..0 */
  27                w.s.high = uu.s.high >> (sizeof(SItype) * BITS_PER_UNIT - 1);
  28                w.s.low = uu.s.high >> -bm;
  29        } else {
  30                USItype carries = (USItype) uu.s.high << bm;
  31                w.s.high = uu.s.high >> b;
  32                w.s.low = ((USItype) uu.s.low >> b) | carries;
  33        }
  34
  35        return w.ll;
  36}
  37