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Annotation of OpenXM_contrib/gmp/mpn/sparc32/v9/sub_n.asm, Revision 1.1

1.1     ! ohara       1: dnl  SPARC mpn_sub_n -- Subtract two limb vectors of the same length > 0 and
        !             2: dnl  store difference in a third 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:
        !            24: include(`../config.m4')
        !            25:
        !            26: C INPUT PARAMETERS
        !            27: define(rp,%o0)
        !            28: define(s1p,%o1)
        !            29: define(s2p,%o2)
        !            30: define(n,%o3)
        !            31: define(cy,%g1)
        !            32:
        !            33: C This code uses 64-bit operations on `o' and `g' registers.  It doesn't
        !            34: C require that `o' registers' upper 32 bits are preserved by the operating
        !            35: C system, but if they are not, they must be zeroed.  That is indeed what
        !            36: C happens at least on Slowaris 2.5 and 2.6.
        !            37:
        !            38: C On UltraSPARC 1 and 2, this code runs at 3 cycles/limb from the Dcache and at
        !            39: C about 10 cycles/limb from the Ecache.
        !            40:
        !            41: ASM_START()
        !            42: PROLOGUE(mpn_sub_n)
        !            43:        lduw    [s1p+0],%o4
        !            44:        lduw    [s2p+0],%o5
        !            45:        addcc   n,-2,n
        !            46:        bl,pn   %icc,L(end1)
        !            47:        lduw    [s1p+4],%g2
        !            48:        lduw    [s2p+4],%g3
        !            49:        be,pn   %icc,L(end2)
        !            50:        mov     0,cy
        !            51:
        !            52:        .align  16
        !            53: L(loop):
        !            54:        sub     %o4,%o5,%g4
        !            55:        add     rp,8,rp
        !            56:        lduw    [s1p+8],%o4
        !            57:        fitod   %f0,%f2
        !            58: C ---
        !            59:        sub     %g4,cy,%g4
        !            60:        addcc   n,-1,n
        !            61:        lduw    [s2p+8],%o5
        !            62:        fitod   %f0,%f2
        !            63: C ---
        !            64:        srlx    %g4,63,cy
        !            65:        add     s2p,8,s2p
        !            66:        stw     %g4,[rp-8]
        !            67:        be,pn   %icc,L(exito)+4
        !            68: C ---
        !            69:        sub     %g2,%g3,%g4
        !            70:        addcc   n,-1,n
        !            71:        lduw    [s1p+12],%g2
        !            72:        fitod   %f0,%f2
        !            73: C ---
        !            74:        sub     %g4,cy,%g4
        !            75:        add     s1p,8,s1p
        !            76:        lduw    [s2p+4],%g3
        !            77:        fitod   %f0,%f2
        !            78: C ---
        !            79:        srlx    %g4,63,cy
        !            80:        bne,pt  %icc,L(loop)
        !            81:        stw     %g4,[rp-4]
        !            82: C ---
        !            83: L(exite):
        !            84:        sub     %o4,%o5,%g4
        !            85:        sub     %g4,cy,%g4
        !            86:        srlx    %g4,63,cy
        !            87:        stw     %g4,[rp+0]
        !            88:        sub     %g2,%g3,%g4
        !            89:        sub     %g4,cy,%g4
        !            90:        stw     %g4,[rp+4]
        !            91:        retl
        !            92:        srlx    %g4,63,%o0
        !            93:
        !            94: L(exito):
        !            95:        sub     %g2,%g3,%g4
        !            96:        sub     %g4,cy,%g4
        !            97:        srlx    %g4,63,cy
        !            98:        stw     %g4,[rp-4]
        !            99:        sub     %o4,%o5,%g4
        !           100:        sub     %g4,cy,%g4
        !           101:        stw     %g4,[rp+0]
        !           102:        retl
        !           103:        srlx    %g4,63,%o0
        !           104:
        !           105: L(end1):
        !           106:        sub     %o4,%o5,%g4
        !           107:        stw     %g4,[rp+0]
        !           108:        retl
        !           109:        srlx    %g4,63,%o0
        !           110:
        !           111: L(end2):
        !           112:        sub     %o4,%o5,%g4
        !           113:        srlx    %g4,63,cy
        !           114:        stw     %g4,[rp+0]
        !           115:        sub     %g2,%g3,%g4
        !           116:        sub     %g4,cy,%g4
        !           117:        stw     %g4,[rp+4]
        !           118:        retl
        !           119:        srlx    %g4,63,%o0
        !           120: EPILOGUE(mpn_sub_n)