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Annotation of OpenXM_contrib/gmp/mpn/power/submul_1.s, Revision 1.1.1.1

1.1       maekawa     1: # IBM POWER __mpn_submul_1 -- Multiply a limb vector with a limb and subtract
                      2: # the result from a second limb vector.
                      3:
                      4: # Copyright (C) 1992, 1994 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: # size         r5
                     28: # s2_limb      r6
                     29:
                     30: # The RS/6000 has no unsigned 32x32->64 bit multiplication instruction.  To
                     31: # obtain that operation, we have to use the 32x32->64 signed multiplication
                     32: # instruction, and add the appropriate compensation to the high limb of the
                     33: # result.  We add the multiplicand if the multiplier has its most significant
                     34: # bit set, and we add the multiplier if the multiplicand has its most
                     35: # significant bit set.  We need to preserve the carry flag between each
                     36: # iteration, so we have to compute the compensation carefully (the natural,
                     37: # srai+and doesn't work).  Since the POWER architecture has a branch unit
                     38: # we can branch in zero cycles, so that's how we perform the additions.
                     39:
                     40:        .toc
                     41:        .csect .__mpn_submul_1[PR]
                     42:        .align 2
                     43:        .globl __mpn_submul_1
                     44:        .globl .__mpn_submul_1
                     45:        .csect __mpn_submul_1[DS]
                     46: __mpn_submul_1:
                     47:        .long .__mpn_submul_1[PR], TOC[tc0], 0
                     48:        .csect .__mpn_submul_1[PR]
                     49: .__mpn_submul_1:
                     50:
                     51:        cal     3,-4(3)
                     52:        l       0,0(4)
                     53:        cmpi    0,6,0
                     54:        mtctr   5
                     55:        mul     9,0,6
                     56:        srai    7,0,31
                     57:        and     7,7,6
                     58:        mfmq    11
                     59:        cax     9,9,7
                     60:        l       7,4(3)
                     61:        sf      8,11,7          # add res_limb
                     62:        a       11,8,11         # invert cy (r11 is junk)
                     63:        blt     Lneg
                     64: Lpos:  bdz     Lend
                     65:
                     66: Lploop:        lu      0,4(4)
                     67:        stu     8,4(3)
                     68:        cmpi    0,0,0
                     69:        mul     10,0,6
                     70:        mfmq    0
                     71:        ae      11,0,9          # low limb + old_cy_limb + old cy
                     72:        l       7,4(3)
                     73:        aze     10,10           # propagate cy to new cy_limb
                     74:        sf      8,11,7          # add res_limb
                     75:        a       11,8,11         # invert cy (r11 is junk)
                     76:        bge     Lp0
                     77:        cax     10,10,6         # adjust high limb for negative limb from s1
                     78: Lp0:   bdz     Lend0
                     79:        lu      0,4(4)
                     80:        stu     8,4(3)
                     81:        cmpi    0,0,0
                     82:        mul     9,0,6
                     83:        mfmq    0
                     84:        ae      11,0,10
                     85:        l       7,4(3)
                     86:        aze     9,9
                     87:        sf      8,11,7
                     88:        a       11,8,11         # invert cy (r11 is junk)
                     89:        bge     Lp1
                     90:        cax     9,9,6           # adjust high limb for negative limb from s1
                     91: Lp1:   bdn     Lploop
                     92:
                     93:        b       Lend
                     94:
                     95: Lneg:  cax     9,9,0
                     96:        bdz     Lend
                     97: Lnloop:        lu      0,4(4)
                     98:        stu     8,4(3)
                     99:        cmpi    0,0,0
                    100:        mul     10,0,6
                    101:        mfmq    7
                    102:        ae      11,7,9
                    103:        l       7,4(3)
                    104:        ae      10,10,0         # propagate cy to new cy_limb
                    105:        sf      8,11,7          # add res_limb
                    106:        a       11,8,11         # invert cy (r11 is junk)
                    107:        bge     Ln0
                    108:        cax     10,10,6         # adjust high limb for negative limb from s1
                    109: Ln0:   bdz     Lend0
                    110:        lu      0,4(4)
                    111:        stu     8,4(3)
                    112:        cmpi    0,0,0
                    113:        mul     9,0,6
                    114:        mfmq    7
                    115:        ae      11,7,10
                    116:        l       7,4(3)
                    117:        ae      9,9,0           # propagate cy to new cy_limb
                    118:        sf      8,11,7          # add res_limb
                    119:        a       11,8,11         # invert cy (r11 is junk)
                    120:        bge     Ln1
                    121:        cax     9,9,6           # adjust high limb for negative limb from s1
                    122: Ln1:   bdn     Lnloop
                    123:        b       Lend
                    124:
                    125: Lend0: cal     9,0(10)
                    126: Lend:  st      8,4(3)
                    127:        aze     3,9
                    128:        br