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Annotation of OpenXM_contrib/gmp/mpn/powerpc64/sub_n.asm, Revision 1.1

1.1     ! maekawa     1: # PowerPC-64 mpn_sub_n -- Subtract two limb vectors of the same length > 0
        !             2: # and store difference in a third limb vector.
        !             3:
        !             4: # Copyright (C) 1999, 2000 Free Software Foundation, Inc.b
        !             5:
        !             6: # This file is part of the GNU MP Library.
        !             7:
        !             8: # The GNU MP Library is free software; you can redistribute it and/or modify
        !             9: # it under the terms of the GNU Lesser General Public License as published by
        !            10: # the Free Software Foundation; either version 2.1 of the License, or (at your
        !            11: # option) any later version.
        !            12:
        !            13: # The GNU MP Library is distributed in the hope that it will be useful, but
        !            14: # WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            15: # or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
        !            16: # License for more details.
        !            17:
        !            18: # You should have received a copy of the GNU Lesser General Public License
        !            19: # along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
        !            20: # the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
        !            21: # MA 02111-1307, USA.
        !            22:
        !            23:
        !            24: # INPUT PARAMETERS
        !            25: # res_ptr      r3
        !            26: # s1_ptr       r4
        !            27: # s2_ptr       r5
        !            28: # size         r6
        !            29:
        !            30: include(`../config.m4')
        !            31:
        !            32: ASM_START()
        !            33: PROLOGUE(mpn_sub_n)
        !            34:        mtctr   r6              # copy size into CTR
        !            35:        addic   r0,r6,-1        # set cy
        !            36:        ld      r8,0(r4)        # load least significant s1 limb
        !            37:        ld      r0,0(r5)        # load least significant s2 limb
        !            38:        addi    r3,r3,-8        # offset res_ptr, it's updated before it's used
        !            39:        bdz     .Lend           # If done, skip loop
        !            40: .Loop: ld      r9,8(r4)        # load s1 limb
        !            41:        ld      r10,8(r5)       # load s2 limb
        !            42:        subfe   r7,r0,r8        # subtract limbs with cy, set cy
        !            43:        std     r7,8(r3)        # store result limb
        !            44:        bdz     .Lexit          # decrement CTR and exit if done
        !            45:        ldu     r8,16(r4)       # load s1 limb and update s1_ptr
        !            46:        ldu     r0,16(r5)       # load s2 limb and update s2_ptr
        !            47:        subfe   r7,r10,r9       # subtract limbs with cy, set cy
        !            48:        stdu    r7,16(r3)       # store result limb and update res_ptr
        !            49:        bdnz    .Loop           # decrement CTR and loop back
        !            50:
        !            51: .Lend: subfe   r7,r0,r8
        !            52:        std     r7,8(r3)        # store ultimate result limb
        !            53:        subfe   r3,r0,r0        # load !cy into ...
        !            54:        subfic  r3,r3,0         # ... return value register
        !            55:        blr
        !            56: .Lexit:        subfe   r7,r10,r9
        !            57:        std     r7,16(r3)
        !            58:        subfe   r3,r0,r0        # load !cy into ...
        !            59:        subfic  r3,r3,0         # ... return value register
        !            60:        blr
        !            61: EPILOGUE(mpn_sub_n)