diff options
Diffstat (limited to 'REORG.TODO/sysdeps/sparc/sparc64/sub_n.S')
| -rw-r--r-- | REORG.TODO/sysdeps/sparc/sparc64/sub_n.S | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/sparc/sparc64/sub_n.S b/REORG.TODO/sysdeps/sparc/sparc64/sub_n.S new file mode 100644 index 0000000000..006ae809c8 --- /dev/null +++ b/REORG.TODO/sysdeps/sparc/sparc64/sub_n.S @@ -0,0 +1,54 @@ +/* SPARC v9 __mpn_sub_n -- Subtract two limb vectors of the same length > 0 + and store difference in a third limb vector. + + Copyright (C) 1995-2017 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; see the file COPYING.LIB. If not, + see <http://www.gnu.org/licenses/>. */ + +#include <sysdep.h> + +/* INPUT PARAMETERS + res_ptr %o0 + s1_ptr %o1 + s2_ptr %o2 + size %o3 */ + +ENTRY(__mpn_sub_n) + + sub %g0,%o3,%g5 + sllx %o3,3,%g1 + add %o1,%g1,%o1 ! make s1_ptr point at end + add %o2,%g1,%o2 ! make s2_ptr point at end + add %o0,%g1,%o0 ! make res_ptr point at end + mov 0,%o4 ! clear carry variable + sllx %g5,3,%o5 ! compute initial address index + +1: ldx [%o2+%o5],%g1 ! load s2 limb + add %g5,1,%g5 ! increment loop count + ldx [%o1+%o5],%o3 ! load s1 limb + addcc %g1,%o4,%g1 ! add s2 limb and carry variable + movcc %xcc,0,%o4 ! if carry-out, o4 was 1; clear it + subcc %o3,%g1,%g1 ! subtract s1 limb from sum + stx %g1,[%o0+%o5] ! store result + add %o5,8,%o5 ! increment address index + brnz,pt %g5,1b + movcs %xcc,1,%o4 ! if s1 subtract gave carry, record it + + retl + mov %o4,%o0 + +END(__mpn_sub_n) |