| 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) |