1998-02-12 00:22:09 +01:00
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/* alpha add_n -- Add two limb vectors of the same length > 0 and store
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* sum in a third limb vector.
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*
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* Copyright (C) 1995 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 00:22:09 +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 00:22:09 +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 00:22:09 +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 00:22:09 +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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/*******************
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* mpi_limb_t
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* mpihelp_add_n( mpi_ptr_t res_ptr, ($16)
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* mpi_ptr_t s1_ptr, ($17)
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* mpi_ptr_t s2_ptr, ($18)
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* mpi_size_t size) ($19)
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*/
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.set noreorder
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.set noat
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.text
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.align 3
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.globl mpihelp_add_n
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.ent mpihelp_add_n
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mpihelp_add_n:
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.frame $30,0,$26,0
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ldq $3,0($17)
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ldq $4,0($18)
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subq $19,1,$19
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and $19,4-1,$2 # number of limbs in first loop
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bis $31,$31,$0
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beq $2,.L0 # if multiple of 4 limbs, skip first loop
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subq $19,$2,$19
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.Loop0: subq $2,1,$2
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ldq $5,8($17)
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addq $4,$0,$4
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ldq $6,8($18)
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cmpult $4,$0,$1
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addq $3,$4,$4
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cmpult $4,$3,$0
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stq $4,0($16)
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or $0,$1,$0
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addq $17,8,$17
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addq $18,8,$18
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bis $5,$5,$3
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bis $6,$6,$4
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addq $16,8,$16
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bne $2,.Loop0
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.L0: beq $19,.Lend
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.align 3
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.Loop: subq $19,4,$19
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ldq $5,8($17)
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addq $4,$0,$4
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ldq $6,8($18)
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cmpult $4,$0,$1
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addq $3,$4,$4
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cmpult $4,$3,$0
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stq $4,0($16)
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or $0,$1,$0
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ldq $3,16($17)
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addq $6,$0,$6
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ldq $4,16($18)
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cmpult $6,$0,$1
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addq $5,$6,$6
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cmpult $6,$5,$0
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stq $6,8($16)
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or $0,$1,$0
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ldq $5,24($17)
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addq $4,$0,$4
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ldq $6,24($18)
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cmpult $4,$0,$1
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addq $3,$4,$4
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cmpult $4,$3,$0
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stq $4,16($16)
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or $0,$1,$0
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ldq $3,32($17)
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addq $6,$0,$6
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ldq $4,32($18)
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cmpult $6,$0,$1
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addq $5,$6,$6
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cmpult $6,$5,$0
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stq $6,24($16)
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or $0,$1,$0
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addq $17,32,$17
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addq $18,32,$18
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addq $16,32,$16
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bne $19,.Loop
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.Lend: addq $4,$0,$4
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cmpult $4,$0,$1
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addq $3,$4,$4
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cmpult $4,$3,$0
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stq $4,0($16)
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or $0,$1,$0
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ret $31,($26),1
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.end mpihelp_add_n
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