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dnl mc68020 mpn_mul_1 -- mpn by limb multiply
dnl Copyright 1992, 1994, 1996, 1999-2002 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: 24
C INPUT PARAMETERS
C res_ptr (sp + 4)
C s1_ptr (sp + 8)
C s1_size (sp + 12)
C s2_limb (sp + 16)
define(res_ptr, `a0')
define(s1_ptr, `a1')
define(s1_size, `d2')
define(s2_limb, `d4')
PROLOGUE(mpn_mul_1)
C Save used registers on the stack.
moveml d2-d4, M(-,sp)
C movel d2, M(-,sp)
C movel d3, M(-,sp)
C movel d4, M(-,sp)
C Copy the arguments to registers. Better use movem?
movel M(sp,16), res_ptr
movel M(sp,20), s1_ptr
movel M(sp,24), s1_size
movel M(sp,28), s2_limb
eorw #1, s1_size
clrl d1
lsrl #1, s1_size
bcc L(L1)
subql #1, s1_size
subl d0, d0 C (d0,cy) <= (0,0)
L(Loop):
movel M(s1_ptr,+), d3
mulul s2_limb, d1:d3
addxl d0, d3
movel d3, M(res_ptr,+)
L(L1): movel M(s1_ptr,+), d3
mulul s2_limb, d0:d3
addxl d1, d3
movel d3, M(res_ptr,+)
dbf s1_size, L(Loop)
clrl d3
addxl d3, d0
subl #0x10000, s1_size
bcc L(Loop)
C Restore used registers from stack frame.
moveml M(sp,+), d2-d4
C movel M(sp,+),d4
C movel M(sp,+),d3
C movel M(sp,+),d2
rts
EPILOGUE(mpn_mul_1)
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