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; libgcc routines for ARC cpu.

/* Copyright (C) 1995, 1997,2004 Free Software Foundation, Inc.

This file is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.

In addition to the permissions in the GNU General Public License, the
Free Software Foundation gives you unlimited permission to link the
compiled version of this file into combinations with other programs,
and to distribute those combinations without any restriction coming
from the use of this file.  (The General Public License restrictions
do apply in other respects; for example, they cover modification of
the file, and distribution when not linked into a combine
executable.)

This file is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING.  If not, write to
the Free Software Foundation, 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.  */

#ifdef  L_mulsi3
        .section .text
        .align 4

#ifdef __base__
        .cpu base
        .global ___mulsi3
___mulsi3:

/* This the simple version.

  while (a) 
    {
      if (a & 1)
        r += b;
      a >>= 1;
      b <<= 1;
    }
*/
        mov r2,0                ; Accumulate result here.
.Lloop:
        sub.f 0,r0,0            ; while (a)
        nop
        beq.nd .Ldone
        and.f 0,r0,1            ; if (a & 1)
        add.nz r2,r2,r1         ; r += b
        lsr r0,r0               ; a >>= 1
        b.d .Lloop
        lsl r1,r1               ; b <<= 1
.Ldone:
        j.d blink
        mov r0,r2
#endif

#endif /* L_mulsi3 */

#ifdef  L_umulsidi3
        .section .text
        .align 4

#ifdef __base__
        .cpu base
        .global ___umulsidi3
___umulsidi3:

/* This the simple version.

  while (a) 
    {
      if (a & 1)
        r += b;
      a >>= 1;
      b <<= 1;
    }
*/
        mov r2,0                ; Top part of b.
        mov r3,0                ; Accumulate result here.
        mov r4,0
.Lloop:
        sub.f 0,r0,0            ; while (a)
        nop
        beq.nd .Ldone
        and.f 0,r0,1            ; if (a & 1)
        sub.f 0,r0,0
        nop
        beq .Ldontadd
        add.f r4,r4,r1          ; r += b
        adc   r3,r3,r2
.Ldontadd:
        lsr r0,r0               ; a >>= 1
        lsl.f r1,r1             ; b <<= 1
        b.d .Lloop
        rlc r2,r2
.Ldone:
#ifdef __big_endian__
        mov r1,r4
        j.d blink
        mov r0,r3
#else
        mov r0,r4
        j.d blink
        mov r1,r3
#endif
#endif

#endif /* L_umulsidi3 */

#ifdef L_divmod_tools

; Utilities used by all routines.

        .section .text
        .align 4

; inputs: r0 = numerator, r1 = denominator
; outputs: positive r0/r1,
;          r6.bit1 = sign of numerator, r6.bit0 = sign of result

        .global ___divnorm
___divnorm:
        mov r6,0                ; keep sign in r6
        sub.f 0,r0,0            ; is numerator -ve?
        sub.lt r0,0,r0          ; negate numerator
        mov.lt r6,3             ; sign is -ve
        sub.f 0,r1,0            ; is denominator -ve?
        sub.lt r1,0,r1          ; negate denominator
        xor.lt r6,r6,1          ; toggle sign
        j.nd blink

/*
unsigned long
udivmodsi4(int modwanted, unsigned long num, unsigned long den)
{
  unsigned long bit = 1;
  unsigned long res = 0;

  while (den < num && bit && !(den & (1L<<31)))
    {
      den <<=1;
      bit <<=1;
    }
  while (bit)
    {
      if (num >= den)
        {
          num -= den;
          res |= bit;
        }
      bit >>=1;
      den >>=1;
    }
  if (modwanted) return num;
  return res;
}
*/

; inputs: r0 = numerator, r1 = denominator
; outputs: r0 = quotient, r1 = remainder, r2/r3 trashed

        .global ___udivmodsi4
___udivmodsi4:
        mov r2,1                ; bit = 1
        mov r3,0                ; res = 0
.Lloop1:
        sub.f 0,r1,r0           ; while (den < num
        nop
        bnc.nd .Lloop2
        sub.f 0,r2,0            ; && bit
        nop
        bz.nd .Lloop2
        lsl.f 0,r1              ; && !(den & (1<<31))
        nop
        bc.nd .Lloop2
        lsl r1,r1               ; den <<= 1
        b.d .Lloop1
        lsl r2,r2               ; bit <<= 1
.Lloop2:
        sub.f 0,r2,0            ; while (bit)
        nop
        bz.nd .Ldivmodend
        sub.f 0,r0,r1           ; if (num >= den)
        nop
        bc.nd .Lshiftdown
        sub r0,r0,r1            ; num -= den
        or r3,r3,r2             ; res |= bit
.Lshiftdown:
        lsr r2,r2               ; bit >>= 1
        b.d .Lloop2
        lsr r1,r1               ; den >>= 1
.Ldivmodend:
        mov r1,r0               ; r1 = mod
        j.d blink
        mov r0,r3               ; r0 = res

#endif

#ifdef  L_udivsi3
        .section .text
        .align 4

#ifdef __base__
        .cpu base
        .global ___udivsi3
___udivsi3:
        mov r7,blink
        bl.nd ___udivmodsi4
        j.nd r7
#endif

#endif /* L_udivsi3 */

#ifdef  L_divsi3
        .section .text
        .align 4

#ifdef __base__
        .cpu base
        .global ___divsi3
___divsi3:
        mov r7,blink
        bl.nd ___divnorm
        bl.nd ___udivmodsi4
        and.f 0,r6,1
        sub.nz r0,0,r0          ; cannot go in delay slot, has limm value
        j.nd r7
#endif

#endif /* L_divsi3 */

#ifdef  L_umodsi3
        .section .text
        .align 4

#ifdef __base__
        .cpu base
        .global ___umodsi3
___umodsi3:
        mov r7,blink
        bl.nd ___udivmodsi4
        j.d r7
        mov r0,r1
#endif

#endif /* L_umodsi3 */

#ifdef  L_modsi3
        .section .text
        .align 4

#ifdef __base__
        .cpu base
        .global ___modsi3
___modsi3:
        mov r7,blink
        bl.nd ___divnorm
        bl.nd ___udivmodsi4
        and.f 0,r6,2
        sub.nz r1,0,r1
        j.d r7
        mov r0,r1
#endif

#endif /* L_modsi3 */