arch/sh/lib/lshrsi3.S

   1 /* Copyright (C) 1994, 1995, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
   2    2004, 2005, 2006
   3    Free Software Foundation, Inc.
   4
   5 This file is free software; you can redistribute it and/or modify it
   6 under the terms of the GNU General Public License as published by the
   7 Free Software Foundation; either version 2, or (at your option) any
   8 later version.
   9
  10 In addition to the permissions in the GNU General Public License, the
  11 Free Software Foundation gives you unlimited permission to link the
  12 compiled version of this file into combinations with other programs,
  13 and to distribute those combinations without any restriction coming
  14 from the use of this file.  (The General Public License restrictions
  15 do apply in other respects; for example, they cover modification of
  16 the file, and distribution when not linked into a combine
  17 executable.)
  18
  19 This file is distributed in the hope that it will be useful, but
  20 WITHOUT ANY WARRANTY; without even the implied warranty of
  21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  22 General Public License for more details.
  23
  24 You should have received a copy of the GNU General Public License
  25 along with this program; see the file COPYING.  If not, write to
  26 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
  27 Boston, MA 02110-1301, USA.  */
  28
  29 !! libgcc routines for the Renesas / SuperH SH CPUs.
  30 !! Contributed by Steve Chamberlain.
  31 !! sac@cygnus.com
  32
  33 !! ashiftrt_r4_x, ___ashrsi3, ___ashlsi3, ___lshrsi3 routines
  34 !! recoded in assembly by Toshiyasu Morita
  35 !! tm@netcom.com
  36
  37 /* SH2 optimizations for ___ashrsi3, ___ashlsi3, ___lshrsi3 and
  38    ELF local label prefixes by J"orn Rennecke
  39    amylaar@cygnus.com  */
  40
  41 !
  42 ! __lshrsi3
  43 !
  44 ! Entry:
  45 !
  46 ! r4: Value to shift
  47 ! r5: Shifts
  48 !
  49 ! Exit:
  50 !
  51 ! r0: Result
  52 !
  53 ! Destroys:
  54 !
  55 ! (none)
  56 !
  57         .global __lshrsi3
  58
  59         .align  2
  60 __lshrsi3:
  61         mov     #31,r0
  62         and     r0,r5
  63         mova    lshrsi3_table,r0
  64         mov.b   @(r0,r5),r5
  65 #ifdef __sh1__
  66         add     r5,r0
  67         jmp     @r0
  68 #else
  69         braf    r5
  70 #endif
  71         mov     r4,r0
  72
  73         .align  2
  74 lshrsi3_table:
  75         .byte           lshrsi3_0-lshrsi3_table
  76         .byte           lshrsi3_1-lshrsi3_table
  77         .byte           lshrsi3_2-lshrsi3_table
  78         .byte           lshrsi3_3-lshrsi3_table
  79         .byte           lshrsi3_4-lshrsi3_table
  80         .byte           lshrsi3_5-lshrsi3_table
  81         .byte           lshrsi3_6-lshrsi3_table
  82         .byte           lshrsi3_7-lshrsi3_table
  83         .byte           lshrsi3_8-lshrsi3_table
  84         .byte           lshrsi3_9-lshrsi3_table
  85         .byte           lshrsi3_10-lshrsi3_table
  86         .byte           lshrsi3_11-lshrsi3_table
  87         .byte           lshrsi3_12-lshrsi3_table
  88         .byte           lshrsi3_13-lshrsi3_table
  89         .byte           lshrsi3_14-lshrsi3_table
  90         .byte           lshrsi3_15-lshrsi3_table
  91         .byte           lshrsi3_16-lshrsi3_table
  92         .byte           lshrsi3_17-lshrsi3_table
  93         .byte           lshrsi3_18-lshrsi3_table
  94         .byte           lshrsi3_19-lshrsi3_table
  95         .byte           lshrsi3_20-lshrsi3_table
  96         .byte           lshrsi3_21-lshrsi3_table
  97         .byte           lshrsi3_22-lshrsi3_table
  98         .byte           lshrsi3_23-lshrsi3_table
  99         .byte           lshrsi3_24-lshrsi3_table
 100         .byte           lshrsi3_25-lshrsi3_table
 101         .byte           lshrsi3_26-lshrsi3_table
 102         .byte           lshrsi3_27-lshrsi3_table
 103         .byte           lshrsi3_28-lshrsi3_table
 104         .byte           lshrsi3_29-lshrsi3_table
 105         .byte           lshrsi3_30-lshrsi3_table
 106         .byte           lshrsi3_31-lshrsi3_table
 107
 108 lshrsi3_6:
 109         shlr2   r0
 110 lshrsi3_4:
 111         shlr2   r0
 112 lshrsi3_2:
 113         rts
 114         shlr2   r0
 115
 116 lshrsi3_7:
 117         shlr2   r0
 118 lshrsi3_5:
 119         shlr2   r0
 120 lshrsi3_3:
 121         shlr2   r0
 122 lshrsi3_1:
 123         rts
 124         shlr    r0
 125
 126 lshrsi3_14:
 127         shlr2   r0
 128 lshrsi3_12:
 129         shlr2   r0
 130 lshrsi3_10:
 131         shlr2   r0
 132 lshrsi3_8:
 133         rts
 134         shlr8   r0
 135
 136 lshrsi3_15:
 137         shlr2   r0
 138 lshrsi3_13:
 139         shlr2   r0
 140 lshrsi3_11:
 141         shlr2   r0
 142 lshrsi3_9:
 143         shlr8   r0
 144         rts
 145         shlr    r0
 146
 147 lshrsi3_22:
 148         shlr2   r0
 149 lshrsi3_20:
 150         shlr2   r0
 151 lshrsi3_18:
 152         shlr2   r0
 153 lshrsi3_16:
 154         rts
 155         shlr16  r0
 156
 157 lshrsi3_23:
 158         shlr2   r0
 159 lshrsi3_21:
 160         shlr2   r0
 161 lshrsi3_19:
 162         shlr2   r0
 163 lshrsi3_17:
 164         shlr16  r0
 165         rts
 166         shlr    r0
 167
 168 lshrsi3_30:
 169         shlr2   r0
 170 lshrsi3_28:
 171         shlr2   r0
 172 lshrsi3_26:
 173         shlr2   r0
 174 lshrsi3_24:
 175         shlr16  r0
 176         rts
 177         shlr8   r0
 178
 179 lshrsi3_31:
 180         shlr2   r0
 181 lshrsi3_29:
 182         shlr2   r0
 183 lshrsi3_27:
 184         shlr2   r0
 185 lshrsi3_25:
 186         shlr16  r0
 187         shlr8   r0
 188         rts
 189         shlr    r0
 190
 191 lshrsi3_0:
 192         rts
 193         nop