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      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)
    102