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Annotation of OpenXM_contrib/gmp/mpn/powerpc32/rshift.asm, Revision 1.1

1.1     ! maekawa     1: dnl PowerPC-32 mpn_rshift -- Shift a number right.
        !             2:
        !             3: dnl Copyright (C) 1995, 2000 Free Software Foundation, Inc.
        !             4:
        !             5: dnl This file is part of the GNU MP Library.
        !             6:
        !             7: dnl The GNU MP Library is free software; you can redistribute it and/or modify
        !             8: dnl it under the terms of the GNU Lesser General Public License as published by
        !             9: dnl the Free Software Foundation; either version 2.1 of the License, or (at your
        !            10: dnl option) any later version.
        !            11:
        !            12: dnl The GNU MP Library is distributed in the hope that it will be useful, but
        !            13: dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            14: dnl or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
        !            15: dnl License for more details.
        !            16:
        !            17: dnl You should have received a copy of the GNU Lesser General Public License
        !            18: dnl along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
        !            19: dnl the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
        !            20: dnl MA 02111-1307, USA.
        !            21:
        !            22:
        !            23: dnl INPUT PARAMETERS
        !            24: dnl res_ptr    r3
        !            25: dnl s1_ptr     r4
        !            26: dnl size       r5
        !            27: dnl cnt                r6
        !            28:
        !            29: include(`../config.m4')
        !            30:
        !            31: ASM_START()
        !            32: PROLOGUE(mpn_rshift)
        !            33:        mtctr   r5              C copy size into CTR
        !            34:        addi    r7,r3,-4        C move adjusted res_ptr to free return reg
        !            35:        subfic  r8,r6,32
        !            36:        lwz     r11,0(r4)       C load first s1 limb
        !            37:        slw     r3,r11,r8       C compute function return value
        !            38:        bdz     .Lend1
        !            39:
        !            40: .Loop: lwzu    r10,4(r4)
        !            41:        srw     r9,r11,r6
        !            42:        slw     r12,r10,r8
        !            43:        or      r9,r9,r12
        !            44:        stwu    r9,4(r7)
        !            45:        bdz     .Lend2
        !            46:        lwzu    r11,4(r4)
        !            47:        srw     r9,r10,r6
        !            48:        slw     r12,r11,r8
        !            49:        or      r9,r9,r12
        !            50:        stwu    r9,4(r7)
        !            51:        bdnz    .Loop
        !            52:
        !            53: .Lend1:        srw     r0,r11,r6
        !            54:        stw     r0,4(r7)
        !            55:        blr
        !            56:
        !            57: .Lend2:        srw     r0,r10,r6
        !            58:        stw     r0,4(r7)
        !            59:        blr
        !            60: EPILOGUE(mpn_rshift)