| /* mc68020 __mpn_add_n -- Add two limb vectors of the same length > 0 and store |
| sum in a third limb vector. |
| |
| Copyright (C) 1992, 1994, 1996, 1998, 2012 Free Software Foundation, Inc. |
| |
| This file is part of the GNU MP Library. |
| |
| The GNU MP Library is free software; you can redistribute it and/or modify |
| it under the terms of the GNU Lesser General Public License as published by |
| the Free Software Foundation; either version 2.1 of the License, or (at your |
| option) any later version. |
| |
| The GNU MP Library is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public |
| License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public License |
| along with the GNU MP Library. If not, see <http://www.gnu.org/licenses/>. */ |
| |
| /* |
| INPUT PARAMETERS |
| res_ptr (sp + 4) |
| s1_ptr (sp + 8) |
| s2_ptr (sp + 16) |
| size (sp + 12) |
| */ |
| |
| #include "sysdep.h" |
| #include "asm-syntax.h" |
| |
| TEXT |
| ENTRY(__mpn_add_n) |
| /* Save used registers on the stack. */ |
| movel R(d2),MEM_PREDEC(sp) |
| cfi_adjust_cfa_offset (4) |
| movel R(a2),MEM_PREDEC(sp) |
| cfi_adjust_cfa_offset (4) |
| cfi_rel_offset (R(d2), 4) |
| cfi_rel_offset (R(a2), 0) |
| |
| /* Copy the arguments to registers. Better use movem? */ |
| movel MEM_DISP(sp,12),R(a2) |
| movel MEM_DISP(sp,16),R(a0) |
| movel MEM_DISP(sp,20),R(a1) |
| movel MEM_DISP(sp,24),R(d2) |
| |
| eorw #1,R(d2) |
| lsrl #1,R(d2) |
| bcc L(L1) |
| subql #1,R(d2) /* clears cy as side effect */ |
| |
| L(Loop:) |
| movel MEM_POSTINC(a0),R(d0) |
| movel MEM_POSTINC(a1),R(d1) |
| addxl R(d1),R(d0) |
| movel R(d0),MEM_POSTINC(a2) |
| L(L1:) movel MEM_POSTINC(a0),R(d0) |
| movel MEM_POSTINC(a1),R(d1) |
| addxl R(d1),R(d0) |
| movel R(d0),MEM_POSTINC(a2) |
| |
| dbf R(d2),L(Loop) /* loop until 16 lsb of %4 == -1 */ |
| subxl R(d0),R(d0) /* d0 <= -cy; save cy as 0 or -1 in d0 */ |
| subl #0x10000,R(d2) |
| bcs L(L2) |
| addl R(d0),R(d0) /* restore cy */ |
| bra L(Loop) |
| |
| L(L2:) |
| negl R(d0) |
| |
| /* Restore used registers from stack frame. */ |
| movel MEM_POSTINC(sp),R(a2) |
| cfi_adjust_cfa_offset (-4) |
| cfi_restore (R(a2)) |
| movel MEM_POSTINC(sp),R(d2) |
| cfi_adjust_cfa_offset (-4) |
| cfi_restore (R(d2)) |
| |
| rts |
| END(__mpn_add_n) |