92 lines
2.2 KiB
NASM
92 lines
2.2 KiB
NASM
|
dnl mc68020 mpn_add_n, mpn_sub_n -- add or subtract limb vectors
|
||
|
|
|
||
|
|
dnl Copyright 1992, 1994, 1996, 1999, 2000, 2001, 2002, 2003, 2005 Free
|
||
|
|
dnl Software Foundation, Inc.
|
||
|
|
dnl
|
||
|
|
dnl This file is part of the GNU MP Library.
|
||
|
|
dnl
|
||
|
|
dnl The GNU MP Library is free software; you can redistribute it and/or
|
||
|
|
dnl modify it under the terms of the GNU Lesser General Public License as
|
||
|
|
dnl published by the Free Software Foundation; either version 2.1 of the
|
||
|
|
dnl License, or (at your option) any later version.
|
||
|
|
dnl
|
||
|
|
dnl The GNU MP Library is distributed in the hope that it will be useful,
|
||
|
|
dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||
|
|
dnl Lesser General Public License for more details.
|
||
|
|
dnl
|
||
|
|
dnl You should have received a copy of the GNU Lesser General Public
|
||
|
|
dnl License along with the GNU MP Library; see the file COPYING.LIB. If
|
||
|
|
dnl not, write to the Free Software Foundation, Inc., 51 Franklin Street,
|
||
|
|
dnl Fifth Floor, Boston, MA 02110-1301, USA.
|
||
|
|
|
||
|
|
include(`../config.m4')
|
||
|
|
|
||
|
|
C cycles/limb
|
||
|
|
C 68040: 6
|
||
|
|
|
||
|
|
ifdef(`OPERATION_add_n',`
|
||
|
|
define(M4_inst, addxl)
|
||
|
|
define(M4_function_n, mpn_add_n)
|
||
|
|
',`ifdef(`OPERATION_sub_n',`
|
||
|
|
define(M4_inst, subxl)
|
||
|
|
define(M4_function_n, mpn_sub_n)
|
||
|
|
',
|
||
|
|
`m4_error(`Need OPERATION_add_n or OPERATION_sub_n
|
||
|
|
')')')
|
||
|
|
|
||
|
|
MULFUNC_PROLOGUE(mpn_add_n mpn_sub_n)
|
||
|
|
|
||
|
|
|
||
|
|
C INPUT PARAMETERS
|
||
|
|
C res_ptr (sp + 4)
|
||
|
|
C s1_ptr (sp + 8)
|
||
|
|
C s2_ptr (sp + 12)
|
||
|
|
C size (sp + 16)
|
||
|
|
|
||
|
|
|
||
|
|
PROLOGUE(M4_function_n)
|
||
|
|
|
||
|
|
C Save used registers on the stack.
|
||
|
|
movel d2, M(-,sp)
|
||
|
|
movel a2, M(-,sp)
|
||
|
|
|
||
|
|
C Copy the arguments to registers. Better use movem?
|
||
|
|
movel M(sp,12), a2
|
||
|
|
movel M(sp,16), a0
|
||
|
|
movel M(sp,20), a1
|
||
|
|
movel M(sp,24), d2
|
||
|
|
|
||
|
|
eorw #1, d2
|
||
|
|
lsrl #1, d2
|
||
|
|
bcc L(L1)
|
||
|
|
subql #1, d2 C clears cy as side effect
|
||
|
|
|
||
|
|
L(Loop):
|
||
|
|
movel M(a0,+), d0
|
||
|
|
movel M(a1,+), d1
|
||
|
|
M4_inst d1, d0
|
||
|
|
movel d0, M(a2,+)
|
||
|
|
L(L1): movel M(a0,+), d0
|
||
|
|
movel M(a1,+), d1
|
||
|
|
M4_inst d1, d0
|
||
|
|
movel d0, M(a2,+)
|
||
|
|
|
||
|
|
dbf d2, L(Loop) C loop until 16 lsb of %4 == -1
|
||
|
|
subxl d0, d0 C d0 <= -cy; save cy as 0 or -1 in d0
|
||
|
|
subl #0x10000, d2
|
||
|
|
bcs L(L2)
|
||
|
|
addl d0, d0 C restore cy
|
||
|
|
bra L(Loop)
|
||
|
|
|
||
|
|
L(L2):
|
||
|
|
negl d0
|
||
|
|
|
||
|
|
C Restore used registers from stack frame.
|
||
|
|
movel M(sp,+), a2
|
||
|
|
movel M(sp,+), d2
|
||
|
|
|
||
|
|
rts
|
||
|
|
|
||
|
|
EPILOGUE(M4_function_n)
|