| /* SPARC v9 __mpn_rshift -- |
| |
| Copyright (C) 1996, 1999 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. */ |
| |
| #include <sysdep.h> |
| |
| /* INPUT PARAMETERS |
| res_ptr %o0 |
| src_ptr %o1 |
| size %o2 |
| cnt %o3 */ |
| |
| .register %g2, #scratch |
| .register %g3, #scratch |
| |
| ENTRY(__mpn_rshift) |
| ldx [%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 |
| sllx %g2,%o5,%g1 ! compute function result |
| be,pn %xcc,.L0 ! if multiple of 4 limbs, skip first loop |
| mov %g1,%g5 |
| |
| sub %o2,%g4,%o2 ! adjust count for main loop |
| |
| .Loop0: ldx [%o1+8],%g3 |
| add %o0,8,%o0 |
| add %o1,8,%o1 |
| srlx %g2,%o3,%o4 |
| addcc %g4,-1,%g4 |
| sllx %g3,%o5,%g1 |
| mov %g3,%g2 |
| or %o4,%g1,%o4 |
| bne,pt %xcc,.Loop0 |
| stx %o4,[%o0-8] |
| |
| .L0: brz,pn %o2,.Lend |
| nop |
| |
| .Loop: ldx [%o1+8],%g3 |
| add %o0,32,%o0 |
| srlx %g2,%o3,%o4 |
| addcc %o2,-4,%o2 |
| sllx %g3,%o5,%g1 |
| |
| ldx [%o1+16],%g2 |
| srlx %g3,%o3,%g4 |
| or %o4,%g1,%o4 |
| stx %o4,[%o0-32] |
| sllx %g2,%o5,%g1 |
| |
| ldx [%o1+24],%g3 |
| srlx %g2,%o3,%o4 |
| or %g4,%g1,%g4 |
| stx %g4,[%o0-24] |
| sllx %g3,%o5,%g1 |
| |
| ldx [%o1+32],%g2 |
| srlx %g3,%o3,%g4 |
| or %o4,%g1,%o4 |
| stx %o4,[%o0-16] |
| sllx %g2,%o5,%g1 |
| |
| add %o1,32,%o1 |
| or %g4,%g1,%g4 |
| bne,pt %xcc,.Loop |
| stx %g4,[%o0-8] |
| |
| .Lend: srlx %g2,%o3,%g2 |
| stx %g2,[%o0-0] |
| |
| jmpl %o7+8,%g0 |
| mov %g5,%o0 |
| |
| END(__mpn_rshift) |
