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Annotation of OpenXM_contrib/gmp/mpn/sparc64/rshift.asm, Revision 1.1

1.1     ! maekawa     1: ! SPARC v9 __gmpn_rshift --
        !             2:
        !             3: ! Copyright (C) 1996, 2000 Free Software Foundation, Inc.
        !             4:
        !             5: ! This file is part of the GNU MP Library.
        !             6:
        !             7: ! The GNU MP Library is free software; you can redistribute it and/or modify
        !             8: ! it under the terms of the GNU Lesser General Public License as published by
        !             9: ! the Free Software Foundation; either version 2.1 of the License, or (at your
        !            10: ! option) any later version.
        !            11:
        !            12: ! The GNU MP Library is distributed in the hope that it will be useful, but
        !            13: ! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            14: ! or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
        !            15: ! License for more details.
        !            16:
        !            17: ! You should have received a copy of the GNU Lesser General Public License
        !            18: ! along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
        !            19: ! the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
        !            20: ! MA 02111-1307, USA.
        !            21:
        !            22:
        !            23: ! INPUT PARAMETERS
        !            24: ! res_ptr      %o0
        !            25: ! src_ptr      %o1
        !            26: ! size         %o2
        !            27: ! cnt          %o3
        !            28:
        !            29: include(`../config.m4')
        !            30:
        !            31: ASM_START()
        !            32:        .register       %g2,#scratch
        !            33:        .register       %g3,#scratch
        !            34: PROLOGUE(mpn_rshift)
        !            35:        ldx     [%o1],%g2       ! load first limb
        !            36:        sub     %g0,%o3,%o5     ! negate shift count
        !            37:        add     %o2,-1,%o2
        !            38:        and     %o2,4-1,%g4     ! number of limbs in first loop
        !            39:        sllx    %g2,%o5,%g1     ! compute function result
        !            40:        brz,pn  %g4,L(0)        ! if multiple of 4 limbs, skip first loop
        !            41:        mov     %g1,%g5
        !            42:
        !            43:        sub     %o2,%g4,%o2     ! adjust count for main loop
        !            44:
        !            45: L(loop0):
        !            46:        ldx     [%o1+8],%g3
        !            47:        add     %o0,8,%o0
        !            48:        add     %o1,8,%o1
        !            49:        add     %g4,-1,%g4
        !            50:        srlx    %g2,%o3,%o4
        !            51:        sllx    %g3,%o5,%g1
        !            52:        mov     %g3,%g2
        !            53:        or      %o4,%g1,%o4
        !            54:        brnz,pt %g4,L(loop0)
        !            55:         stx    %o4,[%o0-8]
        !            56:
        !            57: L(0):  brz,pn  %o2,L(end)
        !            58:         nop
        !            59:
        !            60: L(loop1):
        !            61:        ldx     [%o1+8],%g3
        !            62:        add     %o0,32,%o0
        !            63:        add     %o2,-4,%o2
        !            64:        srlx    %g2,%o3,%o4
        !            65:        sllx    %g3,%o5,%g1
        !            66:
        !            67:        ldx     [%o1+16],%g2
        !            68:        srlx    %g3,%o3,%g4
        !            69:        or      %o4,%g1,%o4
        !            70:        stx     %o4,[%o0-32]
        !            71:        sllx    %g2,%o5,%g1
        !            72:
        !            73:        ldx     [%o1+24],%g3
        !            74:        srlx    %g2,%o3,%o4
        !            75:        or      %g4,%g1,%g4
        !            76:        stx     %g4,[%o0-24]
        !            77:        sllx    %g3,%o5,%g1
        !            78:
        !            79:        ldx     [%o1+32],%g2
        !            80:        srlx    %g3,%o3,%g4
        !            81:        or      %o4,%g1,%o4
        !            82:        stx     %o4,[%o0-16]
        !            83:        sllx    %g2,%o5,%g1
        !            84:
        !            85:        add     %o1,32,%o1
        !            86:        or      %g4,%g1,%g4
        !            87:        brnz    %o2,L(loop1)
        !            88:         stx    %g4,[%o0-8]
        !            89:
        !            90: L(end):        srlx    %g2,%o3,%g2
        !            91:        stx     %g2,[%o0-0]
        !            92:        retl
        !            93:        mov     %g5,%o0
        !            94: EPILOGUE(mpn_rshift)