github.com/aergoio/aergo@v1.3.1/libtool/src/gmp-6.1.2/mpn/m68k/mc68020/mul_1.asm (about)

     1  dnl  mc68020 mpn_mul_1 -- mpn by limb multiply
     2  
     3  dnl  Copyright 1992, 1994, 1996, 1999-2002 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:     24
    35  
    36  C INPUT PARAMETERS
    37  C res_ptr	(sp + 4)
    38  C s1_ptr	(sp + 8)
    39  C s1_size	(sp + 12)
    40  C s2_limb	(sp + 16)
    41  
    42  
    43  define(res_ptr, `a0')
    44  define(s1_ptr,  `a1')
    45  define(s1_size, `d2')
    46  define(s2_limb, `d4')
    47  
    48  
    49  PROLOGUE(mpn_mul_1)
    50  
    51  C Save used registers on the stack.
    52  	moveml	d2-d4, M(-,sp)
    53  
    54  C	movel	d2, M(-,sp)
    55  C	movel	d3, M(-,sp)
    56  C	movel	d4, M(-,sp)
    57  
    58  C Copy the arguments to registers.  Better use movem?
    59  	movel	M(sp,16), res_ptr
    60  	movel	M(sp,20), s1_ptr
    61  	movel	M(sp,24), s1_size
    62  	movel	M(sp,28), s2_limb
    63  
    64  	eorw	#1, s1_size
    65  	clrl	d1
    66  	lsrl	#1, s1_size
    67  	bcc	L(L1)
    68  	subql	#1, s1_size
    69  	subl	d0, d0		C (d0,cy) <= (0,0)
    70  
    71  L(Loop):
    72  	movel	M(s1_ptr,+), d3
    73  	mulul	s2_limb, d1:d3
    74  	addxl	d0, d3
    75  	movel	d3, M(res_ptr,+)
    76  L(L1):	movel	M(s1_ptr,+), d3
    77  	mulul	s2_limb, d0:d3
    78  	addxl	d1, d3
    79  	movel	d3, M(res_ptr,+)
    80  
    81  	dbf	s1_size, L(Loop)
    82  	clrl	d3
    83  	addxl	d3, d0
    84  	subl	#0x10000, s1_size
    85  	bcc	L(Loop)
    86  
    87  C Restore used registers from stack frame.
    88  	moveml	M(sp,+), d2-d4
    89  
    90  C	movel	M(sp,+),d4
    91  C	movel	M(sp,+),d3
    92  C	movel	M(sp,+),d2
    93  
    94  	rts
    95  
    96  EPILOGUE(mpn_mul_1)