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Annotation of OpenXM/src/kan96xx/gmp-2.0.2-ssh-2/mpn/mips2/submul_1.s, Revision 1.1.1.1

1.1       takayama    1:  # MIPS __mpn_submul_1 -- Multiply a limb vector with a single limb and
                      2:  # subtract the product from a second limb vector.
                      3:
                      4:  # Copyright (C) 1992, 1994, 1996 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     $4
                     26:  # s1_ptr      $5
                     27:  # size                $6
                     28:  # s2_limb     $7
                     29:
                     30:        .text
                     31:        .align   4
                     32:        .globl   __mpn_submul_1
                     33:        .ent    __mpn_submul_1
                     34: __mpn_submul_1:
                     35:        .set    noreorder
                     36:        .set    nomacro
                     37:
                     38:  # warm up phase 0
                     39:        lw      $8,0($5)
                     40:
                     41:  # warm up phase 1
                     42:        addiu   $5,$5,4
                     43:        multu   $8,$7
                     44:
                     45:        addiu   $6,$6,-1
                     46:        beq     $6,$0,$LC0
                     47:         move   $2,$0           # zero cy2
                     48:
                     49:        addiu   $6,$6,-1
                     50:        beq     $6,$0,$LC1
                     51:        lw      $8,0($5)        # load new s1 limb as early as possible
                     52:
                     53: Loop:  lw      $10,0($4)
                     54:        mflo    $3
                     55:        mfhi    $9
                     56:        addiu   $5,$5,4
                     57:        addu    $3,$3,$2        # add old carry limb to low product limb
                     58:        multu   $8,$7
                     59:        lw      $8,0($5)        # load new s1 limb as early as possible
                     60:        addiu   $6,$6,-1        # decrement loop counter
                     61:        sltu    $2,$3,$2        # carry from previous addition -> $2
                     62:        subu    $3,$10,$3
                     63:        sgtu    $10,$3,$10
                     64:        addu    $2,$2,$10
                     65:        sw      $3,0($4)
                     66:        addiu   $4,$4,4
                     67:        bne     $6,$0,Loop
                     68:         addu   $2,$9,$2        # add high product limb and carry from addition
                     69:
                     70:  # cool down phase 1
                     71: $LC1:  lw      $10,0($4)
                     72:        mflo    $3
                     73:        mfhi    $9
                     74:        addu    $3,$3,$2
                     75:        sltu    $2,$3,$2
                     76:        multu   $8,$7
                     77:        subu    $3,$10,$3
                     78:        sgtu    $10,$3,$10
                     79:        addu    $2,$2,$10
                     80:        sw      $3,0($4)
                     81:        addiu   $4,$4,4
                     82:        addu    $2,$9,$2        # add high product limb and carry from addition
                     83:
                     84:  # cool down phase 0
                     85: $LC0:  lw      $10,0($4)
                     86:        mflo    $3
                     87:        mfhi    $9
                     88:        addu    $3,$3,$2
                     89:        sltu    $2,$3,$2
                     90:        subu    $3,$10,$3
                     91:        sgtu    $10,$3,$10
                     92:        addu    $2,$2,$10
                     93:        sw      $3,0($4)
                     94:        j       $31
                     95:        addu    $2,$9,$2        # add high product limb and carry from addition
                     96:
                     97:        .end    __mpn_submul_1