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Diffstat (limited to 'mpi/hppa/udiv-qrnnd.S')
| -rw-r--r-- | mpi/hppa/udiv-qrnnd.S | 299 |
1 files changed, 299 insertions, 0 deletions
diff --git a/mpi/hppa/udiv-qrnnd.S b/mpi/hppa/udiv-qrnnd.S new file mode 100644 index 0000000..a2024ba --- /dev/null +++ b/mpi/hppa/udiv-qrnnd.S @@ -0,0 +1,299 @@ +/* HP-PA __udiv_qrnnd division support, used from longlong.h. + * This version runs fast on pre-PA7000 CPUs. + * + * Copyright (C) 1993, 1994, 1998, 2001 Free Software Foundation, Inc. + * + * This file is part of GnuPG. + * + * GnuPG is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * GnuPG 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, + * 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. + * The GNU MP Library itself is published under the LGPL; + * however I decided to publish this code under the plain GPL. + */ + + + +/* 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 |