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Annotation of OpenXM_contrib/gmp/mpn/power/rshift.s, Revision 1.1.1.1

1.1       maekawa     1: # IBM POWER __mpn_rshift --
                      2:
                      3: # Copyright (C) 1992, 1994 Free Software Foundation, Inc.
                      4:
                      5: # This file is part of the GNU MP Library.
                      6:
                      7: # The GNU MP Library is free software; you can redistribute it and/or modify
                      8: # it under the terms of the GNU Library General Public License as published by
                      9: # the Free Software Foundation; either version 2 of the License, or (at your
                     10: # option) any later version.
                     11:
                     12: # The GNU MP Library is distributed in the hope that it will be useful, but
                     13: # WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
                     14: # or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
                     15: # License for more details.
                     16:
                     17: # You should have received a copy of the GNU Library General Public License
                     18: # along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
                     19: # the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
                     20: # MA 02111-1307, USA.
                     21:
                     22:
                     23: # INPUT PARAMETERS
                     24: # res_ptr      r3
                     25: # s_ptr                r4
                     26: # size         r5
                     27: # cnt          r6
                     28:
                     29:        .toc
                     30:        .extern __mpn_rshift[DS]
                     31:        .extern .__mpn_rshift
                     32: .csect [PR]
                     33:        .align 2
                     34:        .globl __mpn_rshift
                     35:        .globl .__mpn_rshift
                     36:        .csect __mpn_rshift[DS]
                     37: __mpn_rshift:
                     38:        .long .__mpn_rshift, TOC[tc0], 0
                     39:        .csect [PR]
                     40: .__mpn_rshift:
                     41:        sfi     8,6,32
                     42:        mtctr   5               # put limb count in CTR loop register
                     43:        l       0,0(4)          # read least significant limb
                     44:        ai      9,3,-4          # adjust res_ptr since it's offset in the stu:s
                     45:        sle     3,0,8           # compute carry limb, and init MQ register
                     46:        bdz     Lend2           # if just one limb, skip loop
                     47:        lu      0,4(4)          # read 2:nd least significant limb
                     48:        sleq    7,0,8           # compute least significant limb of result
                     49:        bdz     Lend            # if just two limb, skip loop
                     50: Loop:  lu      0,4(4)          # load next higher limb
                     51:        stu     7,4(9)          # store previous result during read latency
                     52:        sleq    7,0,8           # compute result limb
                     53:        bdn     Loop            # loop back until CTR is zero
                     54: Lend:  stu     7,4(9)          # store 2:nd most significant limb
                     55: Lend2: sre     7,0,6           # compute most significant limb
                     56:        st      7,4(9)          # store it"                             \
                     57:        br