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Annotation of OpenXM_contrib/gmp/mpn/powerpc32/sub_n.s, Revision 1.1.1.1

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