| ! sparc __mpn_rshift -- |
| ! |
| ! Copyright (C) 1995, 1996, 1997 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, write to |
| ! the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
| ! MA 02111-1307, USA. |
| |
| |
| ! INPUT PARAMETERS |
| ! RES_PTR %o0 |
| ! SRC_PTR %o1 |
| ! SIZE %o2 |
| ! CNT %o3 |
| |
| #include <sysdep.h> |
| |
| ENTRY(__mpn_rshift) |
| ld [%o1],%g2 ! load first limb |
| sub %g0,%o3,%o5 ! negate shift count |
| add %o2,-1,%o2 |
| andcc %o2,4-1,%g4 ! number of limbs in first loop |
| sll %g2,%o5,%g1 ! compute function result |
| be LOC(0) ! if multiple of 4 limbs, skip first loop |
| st %g1,[%sp+80] |
| |
| sub %o2,%g4,%o2 ! adjust count for main loop |
| |
| LOC(loop0): |
| ld [%o1+4],%g3 |
| add %o0,4,%o0 |
| add %o1,4,%o1 |
| addcc %g4,-1,%g4 |
| srl %g2,%o3,%o4 |
| sll %g3,%o5,%g1 |
| mov %g3,%g2 |
| or %o4,%g1,%o4 |
| bne LOC(loop0) |
| st %o4,[%o0-4] |
| |
| LOC(0): tst %o2 |
| be LOC(end) |
| nop |
| |
| LOC(loop): |
| ld [%o1+4],%g3 |
| add %o0,16,%o0 |
| addcc %o2,-4,%o2 |
| srl %g2,%o3,%o4 |
| sll %g3,%o5,%g1 |
| |
| ld [%o1+8],%g2 |
| srl %g3,%o3,%g4 |
| or %o4,%g1,%o4 |
| st %o4,[%o0-16] |
| sll %g2,%o5,%g1 |
| |
| ld [%o1+12],%g3 |
| srl %g2,%o3,%o4 |
| or %g4,%g1,%g4 |
| st %g4,[%o0-12] |
| sll %g3,%o5,%g1 |
| |
| ld [%o1+16],%g2 |
| srl %g3,%o3,%g4 |
| or %o4,%g1,%o4 |
| st %o4,[%o0-8] |
| sll %g2,%o5,%g1 |
| |
| add %o1,16,%o1 |
| or %g4,%g1,%g4 |
| bne LOC(loop) |
| st %g4,[%o0-4] |
| |
| LOC(end): |
| srl %g2,%o3,%g2 |
| st %g2,[%o0-0] |
| retl |
| ld [%sp+80],%o0 |
| |
| END(__mpn_rshift) |
