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

1.1     ! maekawa     1: dnl PowerPC-32 mpn_sub_n -- Subtract two limb vectors of the same length > 0
        !             2: dnl and store difference in a third limb vector.
        !             3:
        !             4: dnl Copyright (C) 1995, 1997, 2000 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 by
        !            10: dnl the Free Software Foundation; either version 2.1 of the License, or (at your
        !            11: dnl 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: dnl INPUT PARAMETERS
        !            25: dnl res_ptr    r3
        !            26: dnl s1_ptr     r4
        !            27: dnl s2_ptr     r5
        !            28: dnl size       r6
        !            29:
        !            30: include(`../config.m4')
        !            31:
        !            32: ASM_START()
        !            33: PROLOGUE(mpn_sub_n)
        !            34:        mtctr   r6              C copy size into CTR
        !            35:        addic   r0,r6,-1        C set cy
        !            36:        lwz     r8,0(r4)        C load least significant s1 limb
        !            37:        lwz     r0,0(r5)        C load least significant s2 limb
        !            38:        addi    r3,r3,-4        C offset res_ptr, it's updated before it's used
        !            39:        bdz     .Lend           C If done, skip loop
        !            40: .Loop: lwz     r9,4(r4)        C load s1 limb
        !            41:        lwz     r10,4(r5)       C load s2 limb
        !            42:        subfe   r7,r0,r8        C subtract limbs with cy, set cy
        !            43:        stw     r7,4(r3)        C store result limb
        !            44:        bdz     .Lexit          C decrement CTR and exit if done
        !            45:        lwzu    r8,8(r4)        C load s1 limb and update s1_ptr
        !            46:        lwzu    r0,8(r5)        C load s2 limb and update s2_ptr
        !            47:        subfe   r7,r10,r9       C subtract limbs with cy, set cy
        !            48:        stwu    r7,8(r3)        C store result limb and update res_ptr
        !            49:        bdnz    .Loop           C decrement CTR and loop back
        !            50:
        !            51: .Lend: subfe   r7,r0,r8
        !            52:        stw     r7,4(r3)        C store ultimate result limb
        !            53:        subfe   r3,r0,r0        C load !cy into ...
        !            54:        subfic  r3,r3,0         C ... return value register
        !            55:        blr
        !            56: .Lexit:        subfe   r7,r10,r9
        !            57:        stw     r7,8(r3)
        !            58:        subfe   r3,r0,r0        C load !cy into ...
        !            59:        subfic  r3,r3,0         C ... return value register
        !            60:        blr
        !            61: EPILOGUE(mpn_sub_n)