LXR linux/arch/frv/lib/_

   1/* __lshrdi3.S: 64-bit logical shift right
   2 *
   3 * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
   4 * Written by David Howells (dhowells@redhat.com)
   5 *
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU General Public License
   8 * as published by the Free Software Foundation; either version
   9 * 2 of the License, or (at your option) any later version.
  10 */
  11
  12        .text
  13        .p2align        4
  14
  15###############################################################################
  16#
  17# unsigned long long __lshrdi3(unsigned long long value [GR8:GR9], unsigned by [GR10])
  18#
  19###############################################################################
  20        .globl          __lshrdi3
  21        .type           __lshrdi3,@function
  22__lshrdi3:
  23        andicc.p        gr10,#63,gr10,icc0
  24        setlos          #32,gr5
  25        andicc.p        gr10,#32,gr0,icc1
  26        beqlr           icc0,#0
  27        ckeq            icc1,cc4                        ; cc4 is true if 0<N<32
  28
  29        # deal with a shift in the range 1<=N<=31
  30        csrl.p          gr9,gr10,gr9    ,cc4,#1         ; LSW >>= N
  31        csub            gr5,gr10,gr5    ,cc4,#1         ; M = 32 - N
  32        csll.p          gr8,gr5,gr4     ,cc4,#1
  33        csrl            gr8,gr10,gr8    ,cc4,#1         ; MSW >>= N
  34        cor.p           gr4,gr9,gr9     ,cc4,#1         ; LSW |= MSW << M
  35
  36        # deal with a shift in the range 32<=N<=63
  37        csrl            gr8,gr10,gr9    ,cc4,#0         ; LSW = MSW >> (N & 31 [implicit AND])
  38        cor.p           gr0,gr0,gr8     ,cc4,#0         ; MSW = 0
  39        bralr
  40        .size           __lshrdi3, .-__lshrdi3
  41