github.com/aergoio/aergo@v1.3.1/libtool/src/gmp-6.1.2/mpn/m68k/mc68020/aorsmul_1.asm (about)

     1  dnl  mc68020 mpn_addmul_1, mpn_submul_1 -- add or subtract mpn multiple.
     2  
     3  dnl  Copyright 1992, 1994, 1996, 1999-2002, 2011 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:     25
    35  
    36  ifdef(`OPERATION_addmul_1',`
    37    define(M4_inst,       addl)
    38    define(M4_function_1, mpn_addmul_1)
    39  ',`ifdef(`OPERATION_submul_1',`
    40    define(M4_inst,       subl)
    41    define(M4_function_1, mpn_submul_1)
    42  ',
    43  `m4_error(`Need OPERATION_addmul_1 or OPERATION_submul_1
    44  ')')')
    45  
    46  
    47  C INPUT PARAMETERS
    48  C res_ptr	(sp + 4)
    49  C s1_ptr	(sp + 8)
    50  C s1_size	(sp + 12)
    51  C s2_limb	(sp + 16)
    52  
    53  define(res_ptr, `a0')
    54  define(s1_ptr,  `a1')
    55  define(s1_size, `d2')
    56  define(s2_limb, `d4')
    57  
    58  MULFUNC_PROLOGUE(mpn_addmul_1 mpn_submul_1)
    59  
    60  PROLOGUE(M4_function_1)
    61  
    62  C Save used registers on the stack.
    63  	moveml	d2-d5, M(-,sp)
    64  
    65  C Copy the arguments to registers.  Better use movem?
    66  	movel	M(sp,20), res_ptr
    67  	movel	M(sp,24), s1_ptr
    68  	movel	M(sp,28), s1_size
    69  	movel	M(sp,32), s2_limb
    70  
    71  	eorw	#1, s1_size
    72  	clrl	d1
    73  	clrl	d5
    74  	lsrl	#1, s1_size
    75  	bcc	L(L1)
    76  	subql	#1, s1_size
    77  	subl	d0, d0		C (d0,cy) <= (0,0)
    78  
    79  L(Loop):
    80  	movel	M(s1_ptr,+), d3
    81  	mulul	s2_limb, d1:d3
    82  	addxl	d0, d3
    83  	addxl	d5, d1
    84  	M4_inst	d3, M(res_ptr,+)
    85  L(L1):	movel	M(s1_ptr,+), d3
    86  	mulul	s2_limb, d0:d3
    87  	addxl	d1, d3
    88  	addxl	d5, d0
    89  	M4_inst	d3, M(res_ptr,+)
    90  
    91  	dbf	s1_size, L(Loop)
    92  	addxl	d5, d0
    93  	subl	#0x10000, s1_size
    94  	bcc	L(Loop)
    95  
    96  C Restore used registers from stack frame.
    97  	moveml	M(sp,+), d2-d5
    98  
    99  	rts
   100  
   101  EPILOGUE(M4_function_1)