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dnl mc68020 mpn_add_n, mpn_sub_n -- add or subtract limb vectors
dnl Copyright 1992, 1994, 1996, 1999-2003, 2005 Free Software Foundation, Inc.
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 modify
dnl it under the terms of either:
dnl
dnl * the GNU Lesser General Public License as published by the Free
dnl Software Foundation; either version 3 of the License, or (at your
dnl option) any later version.
dnl
dnl or
dnl
dnl * the GNU General Public License as published by the Free Software
dnl Foundation; either version 2 of the License, or (at your option) any
dnl later version.
dnl
dnl or both in parallel, as here.
dnl
dnl The GNU MP Library is distributed in the hope that it will be useful, but
dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
dnl for more details.
dnl
dnl You should have received copies of the GNU General Public License and the
dnl GNU Lesser General Public License along with the GNU MP Library. If not,
dnl see https://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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