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      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)
     97