arch/frv/lib/__ashrdi3.S

   1 /* __ashrdi3.S: 64-bit arithmetic 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 # signed long long __ashrdi3(signed long long value [GR8:GR9], unsigned by [GR10])
  18 #
  19 ###############################################################################
  20         .globl          __ashrdi3
  21         .type           __ashrdi3,@function
  22 __ashrdi3:
  23         andicc.p        gr10,#63,gr10,icc0
  24         setlos          #32,gr5
  25         andicc.p        gr10,#32,gr0,icc1
  26         beqlr           icc0,#0
  27         setlos.p        #31,gr6
  28         ckeq            icc1,cc4                        ; cc4 is true if 0<N<32
  29
  30         # deal with a shift in the range 1<=N<=31
  31         csrl.p          gr9,gr10,gr9    ,cc4,#1         ; LSW >>= N
  32         csub            gr5,gr10,gr5    ,cc4,#1         ; M = 32 - N
  33         csll.p          gr8,gr5,gr4     ,cc4,#1
  34         csra            gr8,gr10,gr8    ,cc4,#1         ; MSW >>= N
  35         cor.p           gr4,gr9,gr9     ,cc4,#1         ; LSW |= MSW << M
  36
  37         # deal with a shift in the range 32<=N<=63
  38         csra            gr8,gr10,gr9    ,cc4,#0         ; LSW = MSW >> (N & 31 [implicit AND])
  39         csra.p          gr8,gr6,gr8     ,cc4,#0         ; MSW >>= 31
  40         bralr
  41         .size           __ashrdi3, .-__ashrdi3