1995-02-17 21:13:09 +01:00
|
|
|
/* mc68020 __mpn_submul_1 -- Multiply a limb vector with a limb and subtract
|
|
|
|
the result from a second limb vector.
|
|
|
|
|
2015-01-02 17:28:19 +01:00
|
|
|
Copyright (C) 1992-2015 Free Software Foundation, Inc.
|
1995-02-17 21:13:09 +01:00
|
|
|
|
|
|
|
This file is part of the GNU MP Library.
|
|
|
|
|
|
|
|
The GNU MP Library is free software; you can redistribute it and/or modify
|
2001-07-07 12:13:33 +02:00
|
|
|
it under the terms of the GNU Lesser General Public License as published by
|
|
|
|
the Free Software Foundation; either version 2.1 of the License, or (at your
|
1995-02-17 21:13:09 +01:00
|
|
|
option) any later version.
|
|
|
|
|
|
|
|
The GNU MP Library is distributed in the hope that it will be useful, but
|
|
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
|
2001-07-07 12:13:33 +02:00
|
|
|
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
|
1995-02-17 21:13:09 +01:00
|
|
|
License for more details.
|
|
|
|
|
2001-07-07 12:13:33 +02:00
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
2012-03-10 00:56:38 +01:00
|
|
|
along with the GNU MP Library. If not, see <http://www.gnu.org/licenses/>. */
|
1995-02-17 21:13:09 +01:00
|
|
|
|
|
|
|
/*
|
|
|
|
INPUT PARAMETERS
|
|
|
|
res_ptr (sp + 4)
|
|
|
|
s1_ptr (sp + 8)
|
1996-03-01 19:43:45 +01:00
|
|
|
s1_size (sp + 12)
|
1995-02-17 21:13:09 +01:00
|
|
|
s2_limb (sp + 16)
|
|
|
|
*/
|
|
|
|
|
1996-03-01 19:43:45 +01:00
|
|
|
#include "sysdep.h"
|
1995-02-17 21:13:09 +01:00
|
|
|
#include "asm-syntax.h"
|
|
|
|
|
|
|
|
TEXT
|
1998-03-06 02:48:50 +01:00
|
|
|
ENTRY(__mpn_submul_1)
|
1995-02-17 21:13:09 +01:00
|
|
|
|
|
|
|
#define res_ptr a0
|
|
|
|
#define s1_ptr a1
|
1996-03-01 19:43:45 +01:00
|
|
|
#define s1_size d2
|
1995-02-17 21:13:09 +01:00
|
|
|
#define s2_limb d4
|
|
|
|
|
|
|
|
/* Save used registers on the stack. */
|
1996-03-01 19:43:45 +01:00
|
|
|
moveml R(d2)-R(d5),MEM_PREDEC(sp)
|
2012-01-05 14:52:48 +01:00
|
|
|
cfi_adjust_cfa_offset (4*4)
|
|
|
|
cfi_rel_offset (R(d2), 0)
|
|
|
|
cfi_rel_offset (R(d3), 4)
|
|
|
|
cfi_rel_offset (R(d4), 8)
|
|
|
|
cfi_rel_offset (R(d5), 12)
|
1995-02-17 21:13:09 +01:00
|
|
|
|
|
|
|
/* Copy the arguments to registers. Better use movem? */
|
1996-03-01 19:43:45 +01:00
|
|
|
movel MEM_DISP(sp,20),R(res_ptr)
|
|
|
|
movel MEM_DISP(sp,24),R(s1_ptr)
|
|
|
|
movel MEM_DISP(sp,28),R(s1_size)
|
|
|
|
movel MEM_DISP(sp,32),R(s2_limb)
|
|
|
|
|
|
|
|
eorw #1,R(s1_size)
|
|
|
|
clrl R(d1)
|
|
|
|
clrl R(d5)
|
|
|
|
lsrl #1,R(s1_size)
|
|
|
|
bcc L(L1)
|
|
|
|
subql #1,R(s1_size)
|
|
|
|
subl R(d0),R(d0) /* (d0,cy) <= (0,0) */
|
|
|
|
|
|
|
|
L(Loop:)
|
|
|
|
movel MEM_POSTINC(s1_ptr),R(d3)
|
|
|
|
mulul R(s2_limb),R(d1):R(d3)
|
|
|
|
addxl R(d0),R(d3)
|
|
|
|
addxl R(d5),R(d1)
|
|
|
|
subl R(d3),MEM_POSTINC(res_ptr)
|
|
|
|
L(L1:) movel MEM_POSTINC(s1_ptr),R(d3)
|
|
|
|
mulul R(s2_limb),R(d0):R(d3)
|
|
|
|
addxl R(d1),R(d3)
|
|
|
|
addxl R(d5),R(d0)
|
|
|
|
subl R(d3),MEM_POSTINC(res_ptr)
|
|
|
|
|
|
|
|
dbf R(s1_size),L(Loop)
|
|
|
|
addxl R(d5),R(d0)
|
|
|
|
subl #0x10000,R(s1_size)
|
|
|
|
bcc L(Loop)
|
1995-02-17 21:13:09 +01:00
|
|
|
|
|
|
|
/* Restore used registers from stack frame. */
|
1996-03-01 19:43:45 +01:00
|
|
|
moveml MEM_POSTINC(sp),R(d2)-R(d5)
|
2012-01-05 14:52:48 +01:00
|
|
|
cfi_adjust_cfa_offset (-4*4)
|
|
|
|
cfi_restore (R(d2))
|
|
|
|
cfi_restore (R(d3))
|
|
|
|
cfi_restore (R(d4))
|
|
|
|
cfi_restore (R(d5))
|
1995-02-17 21:13:09 +01:00
|
|
|
|
|
|
|
rts
|
1998-03-06 02:48:50 +01:00
|
|
|
END(__mpn_submul_1)
|