68 lines
1.9 KiB
ArmAsm
68 lines
1.9 KiB
ArmAsm
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/* SPARC v8 __mpn_submul_1 -- Multiply a limb vector with a limb and
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* subtract the result from a second limb vector.
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*
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* Copyright (C) 1992, 1993, 1994, 1998,
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* 2001, 2002 Free Software Foundation, Inc.
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*
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* This file is part of Libgcrypt.
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*
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* Libgcrypt is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* Libgcrypt is distributed in the hope that it will be useful,
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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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License 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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*/
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! INPUT PARAMETERS
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! res_ptr o0
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! s1_ptr o1
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! size o2
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! s2_limb o3
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#include "sysdep.h"
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.text
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.align 4
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.global C_SYMBOL_NAME(_gcry_mpih_submul_1)
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C_SYMBOL_NAME(_gcry_mpih_submul_1):
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sub %g0,%o2,%o2 ! negate ...
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sll %o2,2,%o2 ! ... and scale size
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sub %o1,%o2,%o1 ! o1 is offset s1_ptr
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sub %o0,%o2,%g1 ! g1 is offset res_ptr
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mov 0,%o0 ! clear cy_limb
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Loop: ld [%o1+%o2],%o4
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ld [%g1+%o2],%g2
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umul %o4,%o3,%o5
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rd %y,%g3
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addcc %o5,%o0,%o5
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addx %g3,0,%o0
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subcc %g2,%o5,%g2
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addx %o0,0,%o0
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st %g2,[%g1+%o2]
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addcc %o2,4,%o2
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bne Loop
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nop
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retl
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nop
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