gcc/config/arc/lib1funcs.asm

   1 ; libgcc routines for ARC cpu.
   2
   3 /* Copyright (C) 1995, 1997,2004 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 GCC; 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 #ifdef  L_mulsi3
  30         .section .text
  31         .align 4
  32
  33 #ifdef __base__
  34         .cpu base
  35         .global ___mulsi3
  36 ___mulsi3:
  37
  38 /* This the simple version.
  39
  40   while (a)
  41     {
  42       if (a & 1)
  43         r += b;
  44       a >>= 1;
  45       b <<= 1;
  46     }
  47 */
  48         mov r2,0                ; Accumulate result here.
  49 .Lloop:
  50         sub.f 0,r0,0            ; while (a)
  51         nop
  52         beq.nd .Ldone
  53         and.f 0,r0,1            ; if (a & 1)
  54         add.nz r2,r2,r1         ; r += b
  55         lsr r0,r0               ; a >>= 1
  56         b.d .Lloop
  57         lsl r1,r1               ; b <<= 1
  58 .Ldone:
  59         j.d blink
  60         mov r0,r2
  61 #endif
  62
  63 #endif /* L_mulsi3 */
  64
  65 #ifdef  L_umulsidi3
  66         .section .text
  67         .align 4
  68
  69 #ifdef __base__
  70         .cpu base
  71         .global ___umulsidi3
  72 ___umulsidi3:
  73
  74 /* This the simple version.
  75
  76   while (a)
  77     {
  78       if (a & 1)
  79         r += b;
  80       a >>= 1;
  81       b <<= 1;
  82     }
  83 */
  84         mov r2,0                ; Top part of b.
  85         mov r3,0                ; Accumulate result here.
  86         mov r4,0
  87 .Lloop:
  88         sub.f 0,r0,0            ; while (a)
  89         nop
  90         beq.nd .Ldone
  91         and.f 0,r0,1            ; if (a & 1)
  92         sub.f 0,r0,0
  93         nop
  94         beq .Ldontadd
  95         add.f r4,r4,r1          ; r += b
  96         adc   r3,r3,r2
  97 .Ldontadd:
  98         lsr r0,r0               ; a >>= 1
  99         lsl.f r1,r1             ; b <<= 1
 100         b.d .Lloop
 101         rlc r2,r2
 102 .Ldone:
 103 #ifdef __big_endian__
 104         mov r1,r4
 105         j.d blink
 106         mov r0,r3
 107 #else
 108         mov r0,r4
 109         j.d blink
 110         mov r1,r3
 111 #endif
 112 #endif
 113
 114 #endif /* L_umulsidi3 */
 115
 116 #ifdef L_divmod_tools
 117
 118 ; Utilities used by all routines.
 119
 120         .section .text
 121         .align 4
 122
 123 ; inputs: r0 = numerator, r1 = denominator
 124 ; outputs: positive r0/r1,
 125 ;          r6.bit1 = sign of numerator, r6.bit0 = sign of result
 126
 127         .global ___divnorm
 128 ___divnorm:
 129         mov r6,0                ; keep sign in r6
 130         sub.f 0,r0,0            ; is numerator -ve?
 131         sub.lt r0,0,r0          ; negate numerator
 132         mov.lt r6,3             ; sign is -ve
 133         sub.f 0,r1,0            ; is denominator -ve?
 134         sub.lt r1,0,r1          ; negate denominator
 135         xor.lt r6,r6,1          ; toggle sign
 136         j.nd blink
 137
 138 /*
 139 unsigned long
 140 udivmodsi4(int modwanted, unsigned long num, unsigned long den)
 141 {
 142   unsigned long bit = 1;
 143   unsigned long res = 0;
 144
 145   while (den < num && bit && !(den & (1L<<31)))
 146     {
 147       den <<=1;
 148       bit <<=1;
 149     }
 150   while (bit)
 151     {
 152       if (num >= den)
 153         {
 154           num -= den;
 155           res |= bit;
 156         }
 157       bit >>=1;
 158       den >>=1;
 159     }
 160   if (modwanted) return num;
 161   return res;
 162 }
 163 */
 164
 165 ; inputs: r0 = numerator, r1 = denominator
 166 ; outputs: r0 = quotient, r1 = remainder, r2/r3 trashed
 167
 168         .global ___udivmodsi4
 169 ___udivmodsi4:
 170         mov r2,1                ; bit = 1
 171         mov r3,0                ; res = 0
 172 .Lloop1:
 173         sub.f 0,r1,r0           ; while (den < num
 174         nop
 175         bnc.nd .Lloop2
 176         sub.f 0,r2,0            ; && bit
 177         nop
 178         bz.nd .Lloop2
 179         lsl.f 0,r1              ; && !(den & (1<<31))
 180         nop
 181         bc.nd .Lloop2
 182         lsl r1,r1               ; den <<= 1
 183         b.d .Lloop1
 184         lsl r2,r2               ; bit <<= 1
 185 .Lloop2:
 186         sub.f 0,r2,0            ; while (bit)
 187         nop
 188         bz.nd .Ldivmodend
 189         sub.f 0,r0,r1           ; if (num >= den)
 190         nop
 191         bc.nd .Lshiftdown
 192         sub r0,r0,r1            ; num -= den
 193         or r3,r3,r2             ; res |= bit
 194 .Lshiftdown:
 195         lsr r2,r2               ; bit >>= 1
 196         b.d .Lloop2
 197         lsr r1,r1               ; den >>= 1
 198 .Ldivmodend:
 199         mov r1,r0               ; r1 = mod
 200         j.d blink
 201         mov r0,r3               ; r0 = res
 202
 203 #endif
 204
 205 #ifdef  L_udivsi3
 206         .section .text
 207         .align 4
 208
 209 #ifdef __base__
 210         .cpu base
 211         .global ___udivsi3
 212 ___udivsi3:
 213         mov r7,blink
 214         bl.nd ___udivmodsi4
 215         j.nd r7
 216 #endif
 217
 218 #endif /* L_udivsi3 */
 219
 220 #ifdef  L_divsi3
 221         .section .text
 222         .align 4
 223
 224 #ifdef __base__
 225         .cpu base
 226         .global ___divsi3
 227 ___divsi3:
 228         mov r7,blink
 229         bl.nd ___divnorm
 230         bl.nd ___udivmodsi4
 231         and.f 0,r6,1
 232         sub.nz r0,0,r0          ; cannot go in delay slot, has limm value
 233         j.nd r7
 234 #endif
 235
 236 #endif /* L_divsi3 */
 237
 238 #ifdef  L_umodsi3
 239         .section .text
 240         .align 4
 241
 242 #ifdef __base__
 243         .cpu base
 244         .global ___umodsi3
 245 ___umodsi3:
 246         mov r7,blink
 247         bl.nd ___udivmodsi4
 248         j.d r7
 249         mov r0,r1
 250 #endif
 251
 252 #endif /* L_umodsi3 */
 253
 254 #ifdef  L_modsi3
 255         .section .text
 256         .align 4
 257
 258 #ifdef __base__
 259         .cpu base
 260         .global ___modsi3
 261 ___modsi3:
 262         mov r7,blink
 263         bl.nd ___divnorm
 264         bl.nd ___udivmodsi4
 265         and.f 0,r6,2
 266         sub.nz r1,0,r1
 267         j.d r7
 268         mov r0,r1
 269 #endif
 270
 271 #endif /* L_modsi3 */