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

1.1     ! maekawa     1: ! SPARC v9 __gmpn_lshift --
        !             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_lshift)
        !            35:        sllx    %o2,3,%g1
        !            36:        add     %o1,%g1,%o1     ! make %o1 point at end of src
        !            37:        ldx     [%o1-8],%g2     ! load first limb
        !            38:        sub     %g0,%o3,%o5     ! negate shift count
        !            39:        add     %o0,%g1,%o0     ! make %o0 point at end of res
        !            40:        add     %o2,-1,%o2
        !            41:        and     %o2,4-1,%g4     ! number of limbs in first loop
        !            42:        srlx    %g2,%o5,%g1     ! compute function result
        !            43:        brz,pn  %g4,L(0)                ! if multiple of 4 limbs, skip first loop
        !            44:        mov     %g1,%g5
        !            45:
        !            46:        sub     %o2,%g4,%o2     ! adjust count for main loop
        !            47:
        !            48: L(loop0):
        !            49:        ldx     [%o1-16],%g3
        !            50:        add     %o0,-8,%o0
        !            51:        add     %o1,-8,%o1
        !            52:        add     %g4,-1,%g4
        !            53:        sllx    %g2,%o3,%o4
        !            54:        srlx    %g3,%o5,%g1
        !            55:        mov     %g3,%g2
        !            56:        or      %o4,%g1,%o4
        !            57:        brnz,pt %g4,L(loop0)
        !            58:         stx    %o4,[%o0+0]
        !            59:
        !            60: L(0):  brz,pn  %o2,L(end)
        !            61:         nop
        !            62:
        !            63: L(loop1):
        !            64:        ldx     [%o1-16],%g3
        !            65:        add     %o0,-32,%o0
        !            66:        add     %o2,-4,%o2
        !            67:        sllx    %g2,%o3,%o4
        !            68:        srlx    %g3,%o5,%g1
        !            69:
        !            70:        ldx     [%o1-24],%g2
        !            71:        sllx    %g3,%o3,%g4
        !            72:        or      %o4,%g1,%o4
        !            73:        stx     %o4,[%o0+24]
        !            74:        srlx    %g2,%o5,%g1
        !            75:
        !            76:        ldx     [%o1-32],%g3
        !            77:        sllx    %g2,%o3,%o4
        !            78:        or      %g4,%g1,%g4
        !            79:        stx     %g4,[%o0+16]
        !            80:        srlx    %g3,%o5,%g1
        !            81:
        !            82:        ldx     [%o1-40],%g2
        !            83:        sllx    %g3,%o3,%g4
        !            84:        or      %o4,%g1,%o4
        !            85:        stx     %o4,[%o0+8]
        !            86:        srlx    %g2,%o5,%g1
        !            87:
        !            88:        add     %o1,-32,%o1
        !            89:        or      %g4,%g1,%g4
        !            90:        brnz,pt %o2,L(loop1)
        !            91:         stx    %g4,[%o0+0]
        !            92:
        !            93: L(end):        sllx    %g2,%o3,%g2
        !            94:        stx     %g2,[%o0-8]
        !            95:        retl
        !            96:        mov     %g5,%o0
        !            97: EPILOGUE(mpn_lshift)