1/* hppa sub_n -- Sub two limb vectors of the same length > 0 and store 2 * sum in a third limb vector. 3 * 4 * Copyright (C) 1992, 1994, 1998, 5 * 2001, 2002 Free Software Foundation, Inc. 6 * 7 * This file is part of Libgcrypt. 8 * 9 * Libgcrypt is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU Lesser General Public License as 11 * published by the Free Software Foundation; either version 2.1 of 12 * the License, or (at your option) any later version. 13 * 14 * Libgcrypt is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU Lesser General Public License for more details. 18 * 19 * You should have received a copy of the GNU Lesser General Public 20 * License along with this program; if not, write to the Free Software 21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA 22 * 23 * Note: This code is heavily based on the GNU MP Library. 24 * Actually it's the same code with only minor changes in the 25 * way the data is stored; this is to support the abstraction 26 * of an optional secure memory allocation which may be used 27 * to avoid revealing of sensitive data due to paging etc. 28 */ 29 30 31#include "sysdep.h" 32#include "asm-syntax.h" 33 34 35/******************* 36 * mpi_limb_t 37 * _gcry_mpih_sub_n( mpi_ptr_t res_ptr, (gr26) 38 * mpi_ptr_t s1_ptr, (gr25) 39 * mpi_ptr_t s2_ptr, (gr24) 40 * mpi_size_t size) (gr23) 41 * 42 * One might want to unroll this as for other processors, but it turns 43 * out that the data cache contention after a store makes such 44 * unrolling useless. We can't come under 5 cycles/limb anyway. 45 */ 46 47 48 .code 49 .export _gcry_mpih_sub_n 50 .label _gcry_mpih_sub_n 51 .proc 52 .callinfo frame=0,no_calls 53 .entry 54 55 ldws,ma 4(0,%r25),%r20 56 ldws,ma 4(0,%r24),%r19 57 58 addib,= -1,%r23,L$end ; check for (SIZE == 1) 59 sub %r20,%r19,%r28 ; subtract first limbs ignoring cy 60 61 .label L$loop 62 ldws,ma 4(0,%r25),%r20 63 ldws,ma 4(0,%r24),%r19 64 stws,ma %r28,4(0,%r26) 65 addib,<> -1,%r23,L$loop 66 subb %r20,%r19,%r28 67 68 .label L$end 69 stws %r28,0(0,%r26) 70 addc %r0,%r0,%r28 71 bv 0(%r2) 72 subi 1,%r28,%r28 73 74 .exit 75 .procend 76 77 78 79