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Annotation of OpenXM_contrib/gmp/mpn/sh/sh2/submul_1.s, Revision 1.1.1.2

1.1.1.2 ! maekawa     1: ! SH2 __gmpn_submul_1 -- Multiply a limb vector with a limb and subtract
1.1       maekawa     2: ! the result from a second limb vector.
                      3:
1.1.1.2 ! maekawa     4: ! Copyright (C) 1995, 2000 Free Software Foundation, Inc.
1.1       maekawa     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
1.1.1.2 ! maekawa     9: ! it under the terms of the GNU Lesser General Public License as published by
        !            10: ! the Free Software Foundation; either version 2.1 of the License, or (at your
1.1       maekawa    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
1.1.1.2 ! maekawa    15: ! or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
1.1       maekawa    16: ! License for more details.
                     17:
1.1.1.2 ! maekawa    18: ! You should have received a copy of the GNU Lesser General Public License
1.1       maekawa    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
1.1.1.2 ! maekawa    32:        .global ___gmpn_submul_1
        !            33: ___gmpn_submul_1:
1.1       maekawa    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