1998-05-26 15:38:00 +02:00
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/* Alpha 21064 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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2001-04-28 20:53:00 +02:00
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* Copyright (C) 1992, 1994, 1995, 1998, 1999,
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* 2000, 2001 Free Software Foundation, Inc.
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1998-05-26 15:38:00 +02:00
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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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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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/*******************
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* mpi_limb_t
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* mpihelp_submul_1( mpi_ptr_t res_ptr, (r16 )
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* mpi_ptr_t s1_ptr, (r17 )
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* mpi_size_t s1_size, (r18 )
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* mpi_limb_t s2_limb) (r19 )
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*
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* This code runs at 42 cycles/limb on EV4 and 18 cycles/limb on EV5.
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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_submul_1
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.ent mpihelp_submul_1 2
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mpihelp_submul_1:
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.frame $30,0,$26
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ldq $2,0($17) # $2 = s1_limb
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addq $17,8,$17 # s1_ptr++
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subq $18,1,$18 # size--
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mulq $2,$19,$3 # $3 = prod_low
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ldq $5,0($16) # $5 = *res_ptr
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umulh $2,$19,$0 # $0 = prod_high
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beq $18,.Lend1 # jump if size was == 1
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ldq $2,0($17) # $2 = s1_limb
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addq $17,8,$17 # s1_ptr++
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subq $18,1,$18 # size--
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subq $5,$3,$3
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cmpult $5,$3,$4
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stq $3,0($16)
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addq $16,8,$16 # res_ptr++
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beq $18,.Lend2 # jump if size was == 2
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.align 3
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.Loop: mulq $2,$19,$3 # $3 = prod_low
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ldq $5,0($16) # $5 = *res_ptr
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addq $4,$0,$0 # cy_limb = cy_limb + 'cy'
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subq $18,1,$18 # size--
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umulh $2,$19,$4 # $4 = cy_limb
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ldq $2,0($17) # $2 = s1_limb
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addq $17,8,$17 # s1_ptr++
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addq $3,$0,$3 # $3 = cy_limb + prod_low
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cmpult $3,$0,$0 # $0 = carry from (cy_limb + prod_low)
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subq $5,$3,$3
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cmpult $5,$3,$5
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stq $3,0($16)
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addq $16,8,$16 # res_ptr++
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addq $5,$0,$0 # combine carries
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bne $18,.Loop
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.Lend2: mulq $2,$19,$3 # $3 = prod_low
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ldq $5,0($16) # $5 = *res_ptr
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addq $4,$0,$0 # cy_limb = cy_limb + 'cy'
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umulh $2,$19,$4 # $4 = cy_limb
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addq $3,$0,$3 # $3 = cy_limb + prod_low
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cmpult $3,$0,$0 # $0 = carry from (cy_limb + prod_low)
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subq $5,$3,$3
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cmpult $5,$3,$5
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stq $3,0($16)
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addq $5,$0,$0 # combine carries
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addq $4,$0,$0 # cy_limb = prod_high + cy
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ret $31,($26),1
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.Lend1: subq $5,$3,$3
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cmpult $5,$3,$5
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stq $3,0($16)
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addq $0,$5,$0
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ret $31,($26),1
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.end mpihelp_submul_1
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