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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 3 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 License
dnl along with the GNU MP Library. If not, see http://www.gnu.org/licenses/.
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)
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