github.com/aergoio/aergo@v1.3.1/libtool/src/gmp-6.1.2/mpn/m68k/aors_n.asm (about)

     1  dnl  mc68020 mpn_add_n, mpn_sub_n -- add or subtract limb vectors
     2  
     3  dnl  Copyright 1992, 1994, 1996, 1999-2003, 2005 Free Software Foundation, Inc.
     4  
     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 modify
     8  dnl  it under the terms of either:
     9  dnl
    10  dnl    * the GNU Lesser General Public License as published by the Free
    11  dnl      Software Foundation; either version 3 of the License, or (at your
    12  dnl      option) any later version.
    13  dnl
    14  dnl  or
    15  dnl
    16  dnl    * the GNU General Public License as published by the Free Software
    17  dnl      Foundation; either version 2 of the License, or (at your option) any
    18  dnl      later version.
    19  dnl
    20  dnl  or both in parallel, as here.
    21  dnl
    22  dnl  The GNU MP Library is distributed in the hope that it will be useful, but
    23  dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
    24  dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    25  dnl  for more details.
    26  dnl
    27  dnl  You should have received copies of the GNU General Public License and the
    28  dnl  GNU Lesser General Public License along with the GNU MP Library.  If not,
    29  dnl  see https://www.gnu.org/licenses/.
    30  
    31  include(`../config.m4')
    32  
    33  C         cycles/limb
    34  C 68040:      6
    35  
    36  ifdef(`OPERATION_add_n',`
    37    define(M4_inst,       addxl)
    38    define(M4_function_n, mpn_add_n)
    39  ',`ifdef(`OPERATION_sub_n',`
    40    define(M4_inst,       subxl)
    41    define(M4_function_n, mpn_sub_n)
    42  ',
    43  `m4_error(`Need OPERATION_add_n or OPERATION_sub_n
    44  ')')')
    45  
    46  MULFUNC_PROLOGUE(mpn_add_n mpn_sub_n)
    47  
    48  
    49  C INPUT PARAMETERS
    50  C res_ptr	(sp + 4)
    51  C s1_ptr	(sp + 8)
    52  C s2_ptr	(sp + 12)
    53  C size		(sp + 16)
    54  
    55  
    56  PROLOGUE(M4_function_n)
    57  
    58  C Save used registers on the stack.
    59  	movel	d2, M(-,sp)
    60  	movel	a2, M(-,sp)
    61  
    62  C Copy the arguments to registers.  Better use movem?
    63  	movel	M(sp,12), a2
    64  	movel	M(sp,16), a0
    65  	movel	M(sp,20), a1
    66  	movel	M(sp,24), d2
    67  
    68  	eorw	#1, d2
    69  	lsrl	#1, d2
    70  	bcc	L(L1)
    71  	subql	#1, d2	C clears cy as side effect
    72  
    73  L(Loop):
    74  	movel	M(a0,+), d0
    75  	movel	M(a1,+), d1
    76  	M4_inst	d1, d0
    77  	movel	d0, M(a2,+)
    78  L(L1):	movel	M(a0,+), d0
    79  	movel	M(a1,+), d1
    80  	M4_inst	d1, d0
    81  	movel	d0, M(a2,+)
    82  
    83  	dbf	d2, L(Loop)		C loop until 16 lsb of %4 == -1
    84  	subxl	d0, d0			C d0 <= -cy; save cy as 0 or -1 in d0
    85  	subl	#0x10000, d2
    86  	bcs	L(L2)
    87  	addl	d0, d0			C restore cy
    88  	bra	L(Loop)
    89  
    90  L(L2):
    91  	negl	d0
    92  
    93  C Restore used registers from stack frame.
    94  	movel	M(sp,+), a2
    95  	movel	M(sp,+), d2
    96  
    97  	rts
    98  
    99  EPILOGUE(M4_function_n)