release/src-rt-6.x.4708/linux/linux-2.6.36/arch/blackfin/lib/lshrdi3.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
  10 DItype __lshrdi3(DItype u, word_type b)__attribute__((l1_text));
  11 #endif
  12
  13 DItype __lshrdi3(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 = 0;
  27                 w.s.low = (USItype) uu.s.high >> -bm;
  28         } else {
  29                 USItype carries = (USItype) uu.s.high << bm;
  30                 w.s.high = (USItype) uu.s.high >> b;
  31                 w.s.low = ((USItype) uu.s.low >> b) | carries;
  32         }
  33
  34         return w.ll;
  35 }