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Annotation of OpenXM_contrib/gmp/mpn/sh/sh2/submul_1.s, Revision 1.1

1.1     ! maekawa     1: ! SH2 __mpn_submul_1 -- Multiply a limb vector with a limb and subtract
        !             2: ! the result from a second limb vector.
        !             3:
        !             4: ! Copyright (C) 1995 Free Software Foundation, Inc.
        !             5:
        !             6: ! This file is part of the GNU MP Library.
        !             7:
        !             8: ! The GNU MP Library is free software; you can redistribute it and/or modify
        !             9: ! it under the terms of the GNU Library General Public License as published by
        !            10: ! the Free Software Foundation; either version 2 of the License, or (at your
        !            11: ! option) any later version.
        !            12:
        !            13: ! The GNU MP Library is distributed in the hope that it will be useful, but
        !            14: ! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            15: ! or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
        !            16: ! License for more details.
        !            17:
        !            18: ! You should have received a copy of the GNU Library General Public License
        !            19: ! along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
        !            20: ! the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
        !            21: ! MA 02111-1307, USA.
        !            22:
        !            23:
        !            24: ! INPUT PARAMETERS
        !            25: ! res_ptr      r4
        !            26: ! s1_ptr       r5
        !            27: ! size         r6
        !            28: ! s2_limb      r7
        !            29:
        !            30:        .text
        !            31:        .align 1
        !            32:        .global ___mpn_submul_1
        !            33: ___mpn_submul_1:
        !            34:        mov     #0,r2           ! cy_limb = 0
        !            35:        mov     #0,r0           ! Keep r0 = 0 for entire loop
        !            36:        clrt
        !            37:
        !            38: Loop:  mov.l   @r5+,r3
        !            39:        dmulu.l r3,r7
        !            40:        sts     macl,r1
        !            41:        addc    r2,r1           ! lo_prod += old cy_limb
        !            42:        sts     mach,r2         ! new cy_limb = hi_prod
        !            43:        mov.l   @r4,r3
        !            44:        addc    r0,r2           ! cy_limb += T, T = 0
        !            45:        subc    r3,r1
        !            46:        addc    r0,r2           ! cy_limb += T, T = 0
        !            47:        dt      r6
        !            48:        mov.l   r1,@r4
        !            49:        bf.s    Loop
        !            50:        add     #4,r4
        !            51:
        !            52:        rts
        !            53:        mov     r2,r0