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Annotation of OpenXM_contrib/gmp/mpn/powerpc32/750/com_n.asm, Revision 1.1

1.1     ! ohara       1: dnl  PowerPC 750 mpn_com_n -- mpn bitwise one's complement
        !             2:
        !             3: dnl  Copyright 2002 Free Software Foundation, Inc.
        !             4: dnl
        !             5: dnl  This file is part of the GNU MP Library.
        !             6: dnl
        !             7: dnl  The GNU MP Library is free software; you can redistribute it and/or
        !             8: dnl  modify it under the terms of the GNU Lesser General Public License as
        !             9: dnl  published by the Free Software Foundation; either version 2.1 of the
        !            10: dnl  License, or (at your option) any later version.
        !            11: dnl
        !            12: dnl  The GNU MP Library is distributed in the hope that it will be useful,
        !            13: dnl  but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            14: dnl  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
        !            15: dnl  Lesser General Public License for more details.
        !            16: dnl
        !            17: dnl  You should have received a copy of the GNU Lesser General Public
        !            18: dnl  License along with the GNU MP Library; see the file COPYING.LIB.  If
        !            19: dnl  not, write to the Free Software Foundation, Inc., 59 Temple Place -
        !            20: dnl  Suite 330, Boston, MA 02111-1307, USA.
        !            21:
        !            22: include(`../config.m4')
        !            23:
        !            24:
        !            25: C     cycles/limb
        !            26: C 604e:  3.0
        !            27: C 750:   2.0
        !            28: C 7400:  2.0
        !            29:
        !            30:
        !            31: C void mpn_com_n (mp_ptr dst, mp_srcptr src, mp_size_t size);
        !            32: C
        !            33: C This loop form is necessary for the claimed speed.
        !            34:
        !            35: ASM_START()
        !            36: PROLOGUE(mpn_com_n)
        !            37:
        !            38:        C r3    dst
        !            39:        C r4    src
        !            40:        C r5    size
        !            41:
        !            42:        mtctr   r5              C size
        !            43:        lwz     r5, 0(r4)       C src low limb
        !            44:
        !            45:        sub     r4, r4, r3      C src-dst
        !            46:        subi    r3, r3, 4       C dst-4
        !            47:
        !            48:        addi    r4, r4, 8       C src-dst+8
        !            49:        bdz     L(one)
        !            50:
        !            51: L(top):
        !            52:        C r3    &dst[i-1]
        !            53:        C r4    src-dst
        !            54:        C r5    src[i]
        !            55:        C r6    scratch
        !            56:
        !            57:        not     r6, r5          C ~src[i]
        !            58:        lwzx    r5, r4,r3       C src[i+1]
        !            59:
        !            60:        stwu    r6, 4(r3)       C dst[i]
        !            61:        bdnz    L(top)
        !            62:
        !            63: L(one):
        !            64:        not     r6, r5
        !            65:
        !            66:        stw     r6, 4(r3)       C dst[size-1]
        !            67:        blr
        !            68:
        !            69: EPILOGUE()