1998-02-12 20:52:41 +01:00
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/* hppa sub_n -- Sub two limb vectors of the same length > 0 and store
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* sum in a third limb vector.
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* Copyright (C) 1992, 1994 Free Software Foundation, Inc.
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1998-02-24 19:50:46 +01:00
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* Copyright (C) 1998 Free Software Foundation, Inc.
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1998-02-12 20:52:41 +01:00
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*
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1998-02-24 19:50:46 +01:00
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* This file is part of GNUPG.
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1998-02-12 20:52:41 +01:00
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*
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1998-02-24 19:50:46 +01:00
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* GNUPG is free software; you can redistribute it and/or modify
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1998-02-12 20:52:41 +01:00
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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1998-02-24 19:50:46 +01:00
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* GNUPG is distributed in the hope that it will be useful,
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1998-02-12 20:52:41 +01:00
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*
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* Note: This code is heavily based on the GNU MP Library.
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* Actually it's the same code with only minor changes in the
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* way the data is stored; this is to support the abstraction
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* of an optional secure memory allocation which may be used
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* to avoid revealing of sensitive data due to paging etc.
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* The GNU MP Library itself is published under the LGPL;
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* however I decided to publish this code under the plain GPL.
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*/
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#include "sysdep.h"
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#include "asm-syntax.h"
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/*******************
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* mpi_limb_t
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* mpihelp_sub_n( mpi_ptr_t res_ptr, (gr26)
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* mpi_ptr_t s1_ptr, (gr25)
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* mpi_ptr_t s2_ptr, (gr24)
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* mpi_size_t size) (gr23)
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*
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* One might want to unroll this as for other processors, but it turns
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* out that the data cache contention after a store makes such
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* unrolling useless. We can't come under 5 cycles/limb anyway.
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*/
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.code
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.export mpihelp_sub_n
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mpihelp_sub_n
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.proc
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.callinfo frame=0,no_calls
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.entry
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ldws,ma 4(0,%r25),%r20
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ldws,ma 4(0,%r24),%r19
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addib,= -1,%r23,L$end ; check for (SIZE == 1)
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sub %r20,%r19,%r28 ; subtract first limbs ignoring cy
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L$loop ldws,ma 4(0,%r25),%r20
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ldws,ma 4(0,%r24),%r19
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stws,ma %r28,4(0,%r26)
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addib,<> -1,%r23,L$loop
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subb %r20,%r19,%r28
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L$end stws %r28,0(0,%r26)
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addc %r0,%r0,%r28
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bv 0(%r2)
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subi 1,%r28,%r28
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.exit
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.procend
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