2008-04-27 15:55:56 -04:00
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dnl mc68020 mpn_add_n, mpn_sub_n -- add or subtract limb vectors
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dnl Copyright 1992, 1994, 1996, 1999, 2000, 2001, 2002, 2003, 2005 Free
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dnl Software 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: 6
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2010-12-30 02:20:29 -05:00
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define(OPERATION_sub_n,1)
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2008-04-27 15:55:56 -04:00
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ifdef(`OPERATION_add_n',`
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define(M4_inst, addxl)
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define(M4_function_n, mpn_add_n)
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',`ifdef(`OPERATION_sub_n',`
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define(M4_inst, subxl)
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define(M4_function_n, mpn_sub_n)
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',
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`m4_error(`Need OPERATION_add_n or OPERATION_sub_n
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')')')
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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 s2_ptr (sp + 12)
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C size (sp + 16)
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PROLOGUE(M4_function_n)
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C Save used registers on the stack.
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movel d2, M(-,sp)
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movel a2, M(-,sp)
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C Copy the arguments to registers. Better use movem?
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movel M(sp,12), a2
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movel M(sp,16), a0
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movel M(sp,20), a1
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movel M(sp,24), d2
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eorw #1, d2
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lsrl #1, d2
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bcc L(L1)
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subql #1, d2 C clears cy as side effect
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L(Loop):
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movel M(a0,+), d0
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movel M(a1,+), d1
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M4_inst d1, d0
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movel d0, M(a2,+)
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L(L1): movel M(a0,+), d0
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movel M(a1,+), d1
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M4_inst d1, d0
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movel d0, M(a2,+)
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dbf d2, L(Loop) C loop until 16 lsb of %4 == -1
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subxl d0, d0 C d0 <= -cy; save cy as 0 or -1 in d0
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subl #0x10000, d2
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bcs L(L2)
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addl d0, d0 C restore cy
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bra L(Loop)
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L(L2):
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negl d0
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C Restore used registers from stack frame.
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movel M(sp,+), a2
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movel M(sp,+), d2
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rts
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EPILOGUE(M4_function_n)
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