| /* sparc rshift |
| * |
| * Copyright (C) 1995, 1996, 1998, |
| * 2001, 2002 Free Software Foundation, Inc. |
| * |
| * This file is part of Libgcrypt. |
| * |
| * Libgcrypt 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. |
| * |
| * Libgcrypt 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 this program; 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" |
| |
| .text |
| .align 4 |
| .global C_SYMBOL_NAME(_gcry_mpih_rshift) |
| C_SYMBOL_NAME(_gcry_mpih_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 L0 ! if multiple of 4 limbs, skip first loop |
| st %g1,[%sp+80] |
| |
| sub %o2,%g4,%o2 ! adjust count for main loop |
| |
| 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 Loop0 |
| st %o4,[%o0-4] |
| |
| L0: tst %o2 |
| be Lend |
| nop |
| |
| 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 Loop |
| st %g4,[%o0-4] |
| |
| Lend: srl %g2,%o3,%g2 |
| st %g2,[%o0-0] |
| retl |
| ld [%sp+80],%o0 |
| |
