root/arch/sh/lib/lshrsi3.S

   1 /* SPDX-License-Identifier: GPL-2.0+ WITH GCC-exception-2.0
   2 
   3    Copyright (C) 1994, 1995, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
   4    2004, 2005, 2006
   5    Free Software Foundation, Inc.
   6 */
   7 
   8 !! libgcc routines for the Renesas / SuperH SH CPUs.
   9 !! Contributed by Steve Chamberlain.
  10 !! sac@cygnus.com
  11 
  12 !! ashiftrt_r4_x, ___ashrsi3, ___ashlsi3, ___lshrsi3 routines
  13 !! recoded in assembly by Toshiyasu Morita
  14 !! tm@netcom.com
  15 
  16 /* SH2 optimizations for ___ashrsi3, ___ashlsi3, ___lshrsi3 and
  17    ELF local label prefixes by J"orn Rennecke
  18    amylaar@cygnus.com  */
  19 
  20 !
  21 ! __lshrsi3
  22 !
  23 ! Entry:
  24 !
  25 ! r4: Value to shift
  26 ! r5: Shifts
  27 !
  28 ! Exit:
  29 !
  30 ! r0: Result
  31 !
  32 ! Destroys:
  33 !
  34 ! (none)
  35 !
  36 ! __lshrsi3_r0
  37 !
  38 ! Entry:
  39 !
  40 ! r0: Value to shift
  41 ! r5: Shifts
  42 !
  43 ! Exit:
  44 !
  45 ! r0: Result
  46 !
  47 ! Destroys:
  48 !
  49 ! (none)
  50 !
  51         .global __lshrsi3
  52         .global __lshrsi3_r0
  53         
  54         .align  2
  55 __lshrsi3:
  56         mov     r5,r0
  57         .align  2
  58 __lshrsi3_r0:
  59         and     #31,r0
  60         mov.l   r4,@-r15
  61         mov     r0,r4
  62         mova    lshrsi3_table,r0
  63         mov.b   @(r0,r4),r4
  64         add     r4,r0
  65         jmp     @r0
  66         mov.l   @r15+,r0
  67 
  68         .align  2
  69 lshrsi3_table:
  70         .byte           lshrsi3_0-lshrsi3_table
  71         .byte           lshrsi3_1-lshrsi3_table
  72         .byte           lshrsi3_2-lshrsi3_table
  73         .byte           lshrsi3_3-lshrsi3_table
  74         .byte           lshrsi3_4-lshrsi3_table
  75         .byte           lshrsi3_5-lshrsi3_table
  76         .byte           lshrsi3_6-lshrsi3_table
  77         .byte           lshrsi3_7-lshrsi3_table
  78         .byte           lshrsi3_8-lshrsi3_table
  79         .byte           lshrsi3_9-lshrsi3_table
  80         .byte           lshrsi3_10-lshrsi3_table
  81         .byte           lshrsi3_11-lshrsi3_table
  82         .byte           lshrsi3_12-lshrsi3_table
  83         .byte           lshrsi3_13-lshrsi3_table
  84         .byte           lshrsi3_14-lshrsi3_table
  85         .byte           lshrsi3_15-lshrsi3_table
  86         .byte           lshrsi3_16-lshrsi3_table
  87         .byte           lshrsi3_17-lshrsi3_table
  88         .byte           lshrsi3_18-lshrsi3_table
  89         .byte           lshrsi3_19-lshrsi3_table
  90         .byte           lshrsi3_20-lshrsi3_table
  91         .byte           lshrsi3_21-lshrsi3_table
  92         .byte           lshrsi3_22-lshrsi3_table
  93         .byte           lshrsi3_23-lshrsi3_table
  94         .byte           lshrsi3_24-lshrsi3_table
  95         .byte           lshrsi3_25-lshrsi3_table
  96         .byte           lshrsi3_26-lshrsi3_table
  97         .byte           lshrsi3_27-lshrsi3_table
  98         .byte           lshrsi3_28-lshrsi3_table
  99         .byte           lshrsi3_29-lshrsi3_table
 100         .byte           lshrsi3_30-lshrsi3_table
 101         .byte           lshrsi3_31-lshrsi3_table
 102 
 103 lshrsi3_6:
 104         shlr2   r0
 105 lshrsi3_4:
 106         shlr2   r0
 107 lshrsi3_2:
 108         rts
 109         shlr2   r0
 110 
 111 lshrsi3_7:
 112         shlr2   r0
 113 lshrsi3_5:
 114         shlr2   r0
 115 lshrsi3_3:
 116         shlr2   r0
 117 lshrsi3_1:
 118         rts
 119         shlr    r0
 120 
 121 lshrsi3_14:
 122         shlr2   r0
 123 lshrsi3_12:
 124         shlr2   r0
 125 lshrsi3_10:
 126         shlr2   r0
 127 lshrsi3_8:
 128         rts
 129         shlr8   r0
 130 
 131 lshrsi3_15:
 132         shlr2   r0
 133 lshrsi3_13:
 134         shlr2   r0
 135 lshrsi3_11:
 136         shlr2   r0
 137 lshrsi3_9:
 138         shlr8   r0
 139         rts
 140         shlr    r0
 141 
 142 lshrsi3_22:
 143         shlr2   r0
 144 lshrsi3_20:
 145         shlr2   r0
 146 lshrsi3_18:
 147         shlr2   r0
 148 lshrsi3_16:
 149         rts
 150         shlr16  r0
 151 
 152 lshrsi3_23:
 153         shlr2   r0
 154 lshrsi3_21:
 155         shlr2   r0
 156 lshrsi3_19:
 157         shlr2   r0
 158 lshrsi3_17:
 159         shlr16  r0
 160         rts
 161         shlr    r0
 162 
 163 lshrsi3_30:
 164         shlr2   r0
 165 lshrsi3_28:
 166         shlr2   r0
 167 lshrsi3_26:
 168         shlr2   r0
 169 lshrsi3_24:
 170         shlr16  r0
 171         rts
 172         shlr8   r0
 173 
 174 lshrsi3_31:
 175         shlr2   r0
 176 lshrsi3_29:
 177         shlr2   r0
 178 lshrsi3_27:
 179         shlr2   r0
 180 lshrsi3_25:
 181         shlr16  r0
 182         shlr8   r0
 183         rts
 184         shlr    r0
 185 
 186 lshrsi3_0:
 187         rts
 188         nop