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Annotation of OpenXM_contrib/gmp/mpn/pyr/sub_n.s, Revision 1.1.1.3

1.1.1.2   maekawa     1: # Pyramid __gmpn_sub_n -- Subtract two limb vectors of the same length > 0 and
1.1       maekawa     2: # store difference in a third limb vector.
                      3:
1.1.1.3 ! ohara       4: # Copyright 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: .text
                     24:        .align  2
1.1.1.2   maekawa    25: .globl ___gmpn_sub_n
                     26: ___gmpn_sub_n:
1.1       maekawa    27:        movw    $-1,tr0         # representation for carry clear
                     28:
                     29:        movw    pr3,tr2
                     30:        andw    $3,tr2
                     31:        beq     Lend0
                     32:        subw    tr2,pr3
                     33:
                     34: Loop0: rsubw   $0,tr0          # restore carry bit from carry-save register
                     35:
                     36:        movw    (pr1),tr1
                     37:        subwb   (pr2),tr1
                     38:        movw    tr1,(pr0)
                     39:
                     40:        subwb   tr0,tr0
                     41:        addw    $4,pr0
                     42:        addw    $4,pr1
                     43:        addw    $4,pr2
                     44:        addw    $-1,tr2
                     45:        bne     Loop0
                     46:
                     47:        mtstw   pr3,pr3
                     48:        beq     Lend
                     49: Lend0:
                     50: Loop:  rsubw   $0,tr0          # restore carry bit from carry-save register
                     51:
                     52:        movw    (pr1),tr1
                     53:        subwb   (pr2),tr1
                     54:        movw    tr1,(pr0)
                     55:
                     56:        movw    4(pr1),tr1
                     57:        subwb   4(pr2),tr1
                     58:        movw    tr1,4(pr0)
                     59:
                     60:        movw    8(pr1),tr1
                     61:        subwb   8(pr2),tr1
                     62:        movw    tr1,8(pr0)
                     63:
                     64:        movw    12(pr1),tr1
                     65:        subwb   12(pr2),tr1
                     66:        movw    tr1,12(pr0)
                     67:
                     68:        subwb   tr0,tr0
                     69:        addw    $16,pr0
                     70:        addw    $16,pr1
                     71:        addw    $16,pr2
                     72:        addw    $-4,pr3
                     73:        bne     Loop
                     74: Lend:
                     75:        mnegw   tr0,pr0
                     76:        ret