89 lines
2.0 KiB
NASM
89 lines
2.0 KiB
NASM
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dnl mc68020 mpn_mul_1 -- mpn by limb multiply
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dnl Copyright 1992, 1994, 1996, 1999, 2000, 2001, 2002 Free Software
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dnl Foundation, Inc.
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dnl
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dnl This file is part of the GNU MP Library.
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dnl
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dnl The GNU MP Library is free software; you can redistribute it and/or
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dnl modify it under the terms of the GNU Lesser General Public License as
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dnl published by the Free Software Foundation; either version 2.1 of the
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dnl License, or (at your option) any later version.
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dnl
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dnl The GNU MP Library is distributed in the hope that it will be useful,
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dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
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dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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dnl Lesser General Public License for more details.
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dnl
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dnl You should have received a copy of the GNU Lesser General Public
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dnl License along with the GNU MP Library; see the file COPYING.LIB. If
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dnl not, write to the Free Software Foundation, Inc., 51 Franklin Street,
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dnl Fifth Floor, Boston, MA 02110-1301, USA.
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include(`../config.m4')
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C cycles/limb
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C 68040: 24
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C INPUT PARAMETERS
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C res_ptr (sp + 4)
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C s1_ptr (sp + 8)
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C s1_size (sp + 12)
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C s2_limb (sp + 16)
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define(res_ptr, `a0')
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define(s1_ptr, `a1')
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define(s1_size, `d2')
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define(s2_limb, `d4')
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PROLOGUE(mpn_mul_1)
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C Save used registers on the stack.
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moveml d2-d4, M(-,sp)
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C movel d2, M(-,sp)
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C movel d3, M(-,sp)
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C movel d4, M(-,sp)
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C Copy the arguments to registers. Better use movem?
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movel M(sp,16), res_ptr
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movel M(sp,20), s1_ptr
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movel M(sp,24), s1_size
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movel M(sp,28), s2_limb
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eorw #1, s1_size
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clrl d1
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lsrl #1, s1_size
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bcc L(L1)
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subql #1, s1_size
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subl d0, d0 C (d0,cy) <= (0,0)
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L(Loop):
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movel M(s1_ptr,+), d3
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mulul s2_limb, d1:d3
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addxl d0, d3
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movel d3, M(res_ptr,+)
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L(L1): movel M(s1_ptr,+), d3
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mulul s2_limb, d0:d3
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addxl d1, d3
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movel d3, M(res_ptr,+)
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dbf s1_size, L(Loop)
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clrl d3
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addxl d3, d0
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subl #0x10000, s1_size
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bcc L(Loop)
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C Restore used registers from stack frame.
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moveml M(sp,+), d2-d4
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C movel M(sp,+),d4
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C movel M(sp,+),d3
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C movel M(sp,+),d2
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rts
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EPILOGUE(mpn_mul_1)
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