2002-06-29 14:15:02 +00:00
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/* Alpha sub_n -- Subtract two limb vectors of the same length > 0 and
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* store difference in a third limb vector.
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* Copyright (C) 1995, 1998,
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* 2001 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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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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* GnuPG 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 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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2005-05-31 08:39:18 +00:00
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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* USA.
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2002-06-29 14:15:02 +00:00
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*/
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/*******************
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* mpi_limb_t
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* mpihelp_sub_n( mpi_ptr_t res_ptr, (r16)
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* mpi_ptr_t s1_ptr, (r17)
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* mpi_ptr_t s2_ptr, (r18)
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* mpi_size_t size) (r19)
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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_sub_n
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.ent mpihelp_sub_n
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mpihelp_sub_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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subq $3,$4,$4
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cmpult $3,$4,$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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subq $3,$4,$4
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cmpult $3,$4,$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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subq $5,$6,$6
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cmpult $5,$6,$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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subq $3,$4,$4
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cmpult $3,$4,$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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subq $5,$6,$6
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cmpult $5,$6,$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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subq $3,$4,$4
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cmpult $3,$4,$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_sub_n
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