aors_n.asm
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上传日期:2022-08-06
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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)