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Annotation of OpenXM_contrib/gmp/mpn/powerpc32/sub_n.s, Revision 1.1

1.1     ! maekawa     1: # PowerPC-32  __mpn_sub_n -- Subtract two limb vectors of the same length > 0
        !             2: # and store difference in a third limb vector.
        !             3:
        !             4: # Copyright (C) 1992, 1994, 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      r3
        !            26: # s1_ptr       r4
        !            27: # s2_ptr       r5
        !            28: # size         r6
        !            29:
        !            30:        .toc
        !            31:        .extern __mpn_sub_n[DS]
        !            32:        .extern .__mpn_sub_n
        !            33: .csect [PR]
        !            34:        .align 2
        !            35:        .globl __mpn_sub_n
        !            36:        .globl .__mpn_sub_n
        !            37:        .csect __mpn_sub_n[DS]
        !            38: __mpn_sub_n:
        !            39:        .long .__mpn_sub_n, TOC[tc0], 0
        !            40:        .csect [PR]
        !            41: .__mpn_sub_n:
        !            42:        mtctr   6               # copy size into CTR
        !            43:        lwz     8,0(4)          # load least significant s1 limb
        !            44:        lwz     0,0(5)          # load least significant s2 limb
        !            45:        addi    3,3,-4          # offset res_ptr, it's updated before used
        !            46:        subfc   7,0,8           # add least significant limbs, set cy
        !            47:        bdz     Lend            # If done, skip loop
        !            48: Loop:  lwzu    8,4(4)          # load s1 limb and update s1_ptr
        !            49:        lwzu    0,4(5)          # load s2 limb and update s2_ptr
        !            50:        stwu    7,4(3)          # store previous limb in load latency slot
        !            51:        subfe   7,0,8           # add new limbs with cy, set cy
        !            52:        bdnz    Loop            # decrement CTR and loop back
        !            53: Lend:  stw     7,4(3)          # store ultimate result limb
        !            54:        subfe   3,0,0           # load !cy into ...
        !            55:        subfic  3,3,0           # ... return value register
        !            56:        blr