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Annotation of OpenXM_contrib/gmp/mpn/mips64/submul_1.asm, Revision 1.1

1.1     ! ohara       1: dnl  MIPS64 mpn_submul_1 -- Multiply a limb vector with a single limb and
        !             2: dnl  subtract the product from a second limb vector.
        !             3:
        !             4: dnl  Copyright 1992, 1994, 1995, 2000, 2001, 2002 Free Software Foundation,
        !             5: dnl  Inc.
        !             6:
        !             7: dnl  This file is part of the GNU MP Library.
        !             8:
        !             9: dnl  The GNU MP Library is free software; you can redistribute it and/or modify
        !            10: dnl  it under the terms of the GNU Lesser General Public License as published
        !            11: dnl  by the Free Software Foundation; either version 2.1 of the License, or (at
        !            12: dnl  your option) any later version.
        !            13:
        !            14: dnl  The GNU MP Library is distributed in the hope that it will be useful, but
        !            15: dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            16: dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
        !            17: dnl  License for more details.
        !            18:
        !            19: dnl  You should have received a copy of the GNU Lesser General Public License
        !            20: dnl  along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
        !            21: dnl  the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
        !            22: dnl  MA 02111-1307, USA.
        !            23:
        !            24: include(`../config.m4')
        !            25:
        !            26: C INPUT PARAMETERS
        !            27: C res_ptr      $4
        !            28: C s1_ptr       $5
        !            29: C size         $6
        !            30: C s2_limb      $7
        !            31:
        !            32: ASM_START()
        !            33: PROLOGUE(mpn_submul_1)
        !            34:
        !            35: C feed-in phase 0
        !            36:        ld      $8,0($5)
        !            37:
        !            38: C feed-in phase 1
        !            39:        daddiu  $5,$5,8
        !            40:        dmultu  $8,$7
        !            41:
        !            42:        daddiu  $6,$6,-1
        !            43:        beq     $6,$0,$LC0
        !            44:         move   $2,$0           C zero cy2
        !            45:
        !            46:        daddiu  $6,$6,-1
        !            47:        beq     $6,$0,$LC1
        !            48:        ld      $8,0($5)        C load new s1 limb as early as possible
        !            49:
        !            50: Loop:  ld      $10,0($4)
        !            51:        mflo    $3
        !            52:        mfhi    $9
        !            53:        daddiu  $5,$5,8
        !            54:        daddu   $3,$3,$2        C add old carry limb to low product limb
        !            55:        dmultu  $8,$7
        !            56:        ld      $8,0($5)        C load new s1 limb as early as possible
        !            57:        daddiu  $6,$6,-1        C decrement loop counter
        !            58:        sltu    $2,$3,$2        C carry from previous addition -> $2
        !            59:        dsubu   $3,$10,$3
        !            60:        sgtu    $10,$3,$10
        !            61:        daddu   $2,$2,$10
        !            62:        sd      $3,0($4)
        !            63:        daddiu  $4,$4,8
        !            64:        bne     $6,$0,Loop
        !            65:         daddu  $2,$9,$2        C add high product limb and carry from addition
        !            66:
        !            67: C wind-down phase 1
        !            68: $LC1:  ld      $10,0($4)
        !            69:        mflo    $3
        !            70:        mfhi    $9
        !            71:        daddu   $3,$3,$2
        !            72:        sltu    $2,$3,$2
        !            73:        dmultu  $8,$7
        !            74:        dsubu   $3,$10,$3
        !            75:        sgtu    $10,$3,$10
        !            76:        daddu   $2,$2,$10
        !            77:        sd      $3,0($4)
        !            78:        daddiu  $4,$4,8
        !            79:        daddu   $2,$9,$2        C add high product limb and carry from addition
        !            80:
        !            81: C wind-down phase 0
        !            82: $LC0:  ld      $10,0($4)
        !            83:        mflo    $3
        !            84:        mfhi    $9
        !            85:        daddu   $3,$3,$2
        !            86:        sltu    $2,$3,$2
        !            87:        dsubu   $3,$10,$3
        !            88:        sgtu    $10,$3,$10
        !            89:        daddu   $2,$2,$10
        !            90:        sd      $3,0($4)
        !            91:        j       $31
        !            92:        daddu   $2,$9,$2        C add high product limb and carry from addition
        !            93: EPILOGUE(mpn_submul_1)