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Annotation of OpenXM_contrib/gmp/mpn/s390/submul_1.asm, Revision 1.1

1.1     ! ohara       1: dnl  S/390 mpn_submul_1 -- Multiply a limb vector with a limb and subtract the
        !             2: dnl  result from a second limb vector.
        !             3:
        !             4: dnl  Copyright 2001 Free Software Foundation, Inc.
        !             5:
        !             6: dnl  This file is part of the GNU MP Library.
        !             7:
        !             8: dnl  The GNU MP Library is free software; you can redistribute it and/or modify
        !             9: dnl  it under the terms of the GNU Lesser General Public License as published
        !            10: dnl  by the Free Software Foundation; either version 2.1 of the License, or (at
        !            11: dnl  your option) any later version.
        !            12:
        !            13: dnl  The GNU MP Library is distributed in the hope that it will be useful, but
        !            14: dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            15: dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
        !            16: dnl  License for more details.
        !            17:
        !            18: dnl  You should have received a copy of the GNU Lesser General Public License
        !            19: dnl  along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
        !            20: dnl  the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
        !            21: dnl  MA 02111-1307, USA.
        !            22:
        !            23: include(`../config.m4')
        !            24:
        !            25: define(`rp',2)
        !            26: define(`up',3)
        !            27: define(`n',4)
        !            28: define(`vlimb',5)
        !            29: define(`cylimb',7)
        !            30:
        !            31: ASM_START()
        !            32: PROLOGUE(mpn_submul_1)
        !            33:        stm     6,7,24(15)
        !            34:        slr     cylimb,cylimb   # clear cylimb
        !            35:        ltr     vlimb,vlimb
        !            36:        jnl     .Loopp
        !            37:
        !            38: .Loopn:        l       1,0(up)         # load from u
        !            39:        lr      6,1             #
        !            40:        mr      0,vlimb         # multiply signed
        !            41:        alr     0,6             # add vlimb to phi
        !            42:        sra     6,31            # make mask
        !            43:        nr      6,vlimb         # 0 or vlimb
        !            44:        alr     0,6             # conditionally add vlimb to phi
        !            45:        alr     1,cylimb        # add carry limb to plo
        !            46:        brc     8+4,+8          # branch if not carry
        !            47:        ahi     0,1             # increment phi
        !            48:        l       6,0(rp)         # load r limb
        !            49:        slr     6,1             # add u limb to plo
        !            50:        brc     2+1,+8          # branch if not carry
        !            51:        ahi     0,1             # increment phi
        !            52:        lr      cylimb,0        # new cylimb
        !            53:        st      6,0(rp)         # store
        !            54:        la      up,4(,up)
        !            55:        la      rp,4(,rp)
        !            56:        brct    n,.Loopn
        !            57:
        !            58:        lr      2,cylimb
        !            59:        lm      6,7,24(15)
        !            60:        br      14
        !            61:
        !            62: .Loopp:        l       1,0(up)         # load from u
        !            63:        lr      6,1             #
        !            64:        mr      0,vlimb         # multiply signed
        !            65:        sra     6,31            # make mask
        !            66:        nr      6,vlimb         # 0 or vlimb
        !            67:        alr     0,6             # conditionally add vlimb to phi
        !            68:        alr     1,cylimb        # add carry limb to plo
        !            69:        brc     8+4,+8          # branch if not carry
        !            70:        ahi     0,1             # increment phi
        !            71:        l       6,0(rp)         # load r limb
        !            72:        slr     6,1             # add u limb to plo
        !            73:        brc     2+1,+8          # branch if not carry
        !            74:        ahi     0,1             # increment phi
        !            75:        lr      cylimb,0        # new cylimb
        !            76:        st      6,0(rp)         # store
        !            77:        la      up,4(,up)
        !            78:        la      rp,4(,rp)
        !            79:        brct    n,.Loopp
        !            80:
        !            81:        lr      2,cylimb
        !            82:        lm      6,7,24(15)
        !            83:        br      14
        !            84: EPILOGUE(mpn_submul_1)