/* HP-PA __udiv_qrnnd division support, used from longlong.h. * This version runs fast on pre-PA7000 CPUs. * * Copyright (C) 1993, 1994, 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 * * Note: This code is heavily based on the GNU MP Library. * Actually it's the same code with only minor changes in the * way the data is stored; this is to support the abstraction * of an optional secure memory allocation which may be used * to avoid revealing of sensitive data due to paging etc. */ /* INPUT PARAMETERS * rem_ptr gr26 * n1 gr25 * n0 gr24 * d gr23 * * The code size is a bit excessive. We could merge the last two ds;addc * sequences by simply moving the "bb,< Odd" instruction down. The only * trouble is the FFFFFFFF code that would need some hacking. */ .code .export __udiv_qrnnd .label __udiv_qrnnd .proc .callinfo frame=0,no_calls .entry comb,< %r23,0,L$largedivisor sub %r0,%r23,%r1 ; clear cy as side-effect ds %r0,%r1,%r0 addc %r24,%r24,%r24 ds %r25,%r23,%r25 addc %r24,%r24,%r24 ds %r25,%r23,%r25 addc %r24,%r24,%r24 ds %r25,%r23,%r25 addc %r24,%r24,%r24 ds %r25,%r23,%r25 addc %r24,%r24,%r24 ds %r25,%r23,%r25 addc %r24,%r24,%r24 ds %r25,%r23,%r25 addc %r24,%r24,%r24 ds %r25,%r23,%r25 addc %r24,%r24,%r24 ds %r25,%r23,%r25 addc %r24,%r24,%r24 ds %r25,%r23,%r25 addc %r24,%r24,%r24 ds %r25,%r23,%r25 addc %r24,%r24,%r24 ds %r25,%r23,%r25 addc %r24,%r24,%r24 ds %r25,%r23,%r25 addc %r24,%r24,%r24 ds %r25,%r23,%r25 addc %r24,%r24,%r24 ds %r25,%r23,%r25 addc %r24,%r24,%r24 ds %r25,%r23,%r25 addc %r24,%r24,%r24 ds %r25,%r23,%r25 addc %r24,%r24,%r24 ds %r25,%r23,%r25 addc %r24,%r24,%r24 ds %r25,%r23,%r25 addc %r24,%r24,%r24 ds %r25,%r23,%r25 addc %r24,%r24,%r24 ds %r25,%r23,%r25 addc %r24,%r24,%r24 ds %r25,%r23,%r25 addc %r24,%r24,%r24 ds %r25,%r23,%r25 addc %r24,%r24,%r24 ds %r25,%r23,%r25 addc %r24,%r24,%r24 ds %r25,%r23,%r25 addc %r24,%r24,%r24 ds %r25,%r23,%r25 addc %r24,%r24,%r24 ds %r25,%r23,%r25 addc %r24,%r24,%r24 ds %r25,%r23,%r25 addc %r24,%r24,%r24 ds %r25,%r23,%r25 addc %r24,%r24,%r24 ds %r25,%r23,%r25 addc %r24,%r24,%r24 ds %r25,%r23,%r25 addc %r24,%r24,%r24 ds %r25,%r23,%r25 addc %r24,%r24,%r28 ds %r25,%r23,%r25 comclr,>= %r25,%r0,%r0 addl %r25,%r23,%r25 stws %r25,0(0,%r26) bv 0(%r2) addc %r28,%r28,%r28 .label L$largedivisor extru %r24,31,1,%r19 ; r19 = n0 & 1 bb,< %r23,31,L$odd extru %r23,30,31,%r22 ; r22 = d >> 1 shd %r25,%r24,1,%r24 ; r24 = new n0 extru %r25,30,31,%r25 ; r25 = new n1 sub %r0,%r22,%r21 ds %r0,%r21,%r0 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 comclr,>= %r25,%r0,%r0 addl %r25,%r22,%r25 sh1addl %r25,%r19,%r25 stws %r25,0(0,%r26) bv 0(%r2) addc %r24,%r24,%r28 .label L$odd addib,sv,n 1,%r22,L$FF.. ; r22 = (d / 2 + 1) shd %r25,%r24,1,%r24 ; r24 = new n0 extru %r25,30,31,%r25 ; r25 = new n1 sub %r0,%r22,%r21 ds %r0,%r21,%r0 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r24 ds %r25,%r22,%r25 addc %r24,%r24,%r28 comclr,>= %r25,%r0,%r0 addl %r25,%r22,%r25 sh1addl %r25,%r19,%r25 ; We have computed (n1,,n0) / (d + 1), q' = r28, r' = r25 add,nuv %r28,%r25,%r25 addl %r25,%r1,%r25 addc %r0,%r28,%r28 sub,<< %r25,%r23,%r0 addl %r25,%r1,%r25 stws %r25,0(0,%r26) bv 0(%r2) addc %r0,%r28,%r28 ; This is just a special case of the code above. ; We come here when d == 0xFFFFFFFF .label L$FF.. add,uv %r25,%r24,%r24 sub,<< %r24,%r23,%r0 ldo 1(%r24),%r24 stws %r24,0(0,%r26) bv 0(%r2) addc %r0,%r25,%r28 .exit .procend