| /* Alpha 21064 submul_1 -- Multiply a limb vector with a limb and |
| * subtract the result from a second limb vector. |
| * Copyright (C) 1992, 1994, 1995, 1998, |
| * 2001, 2002 Free Software Foundation, Inc. |
| * |
| * This file is part of Libgcrypt. |
| * |
| * Libgcrypt is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU Lesser General Public License as |
| * published by the Free Software Foundation; either version 2.1 of |
| * the License, or (at your option) any later version. |
| * |
| * Libgcrypt is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA |
| */ |
| |
| |
| /******************* |
| * mpi_limb_t |
| * _gcry_mpih_submul_1( mpi_ptr_t res_ptr, (r16 ) |
| * mpi_ptr_t s1_ptr, (r17 ) |
| * mpi_size_t s1_size, (r18 ) |
| * mpi_limb_t s2_limb) (r19 ) |
| * |
| * This code runs at 42 cycles/limb on EV4 and 18 cycles/limb on EV5. |
| */ |
| |
| .set noreorder |
| .set noat |
| .text |
| .align 3 |
| .globl _gcry_mpih_submul_1 |
| .ent _gcry_mpih_submul_1 2 |
| _gcry_mpih_submul_1: |
| .frame $30,0,$26 |
| |
| ldq $2,0($17) # $2 = s1_limb |
| addq $17,8,$17 # s1_ptr++ |
| subq $18,1,$18 # size-- |
| mulq $2,$19,$3 # $3 = prod_low |
| ldq $5,0($16) # $5 = *res_ptr |
| umulh $2,$19,$0 # $0 = prod_high |
| beq $18,.Lend1 # jump if size was == 1 |
| ldq $2,0($17) # $2 = s1_limb |
| addq $17,8,$17 # s1_ptr++ |
| subq $18,1,$18 # size-- |
| subq $5,$3,$3 |
| cmpult $5,$3,$4 |
| stq $3,0($16) |
| addq $16,8,$16 # res_ptr++ |
| beq $18,.Lend2 # jump if size was == 2 |
| |
| .align 3 |
| .Loop: mulq $2,$19,$3 # $3 = prod_low |
| ldq $5,0($16) # $5 = *res_ptr |
| addq $4,$0,$0 # cy_limb = cy_limb + 'cy' |
| subq $18,1,$18 # size-- |
| umulh $2,$19,$4 # $4 = cy_limb |
| ldq $2,0($17) # $2 = s1_limb |
| addq $17,8,$17 # s1_ptr++ |
| addq $3,$0,$3 # $3 = cy_limb + prod_low |
| cmpult $3,$0,$0 # $0 = carry from (cy_limb + prod_low) |
| subq $5,$3,$3 |
| cmpult $5,$3,$5 |
| stq $3,0($16) |
| addq $16,8,$16 # res_ptr++ |
| addq $5,$0,$0 # combine carries |
| bne $18,.Loop |
| |
| .Lend2: mulq $2,$19,$3 # $3 = prod_low |
| ldq $5,0($16) # $5 = *res_ptr |
| addq $4,$0,$0 # cy_limb = cy_limb + 'cy' |
| umulh $2,$19,$4 # $4 = cy_limb |
| addq $3,$0,$3 # $3 = cy_limb + prod_low |
| cmpult $3,$0,$0 # $0 = carry from (cy_limb + prod_low) |
| subq $5,$3,$3 |
| cmpult $5,$3,$5 |
| stq $3,0($16) |
| addq $5,$0,$0 # combine carries |
| addq $4,$0,$0 # cy_limb = prod_high + cy |
| ret $31,($26),1 |
| .Lend1: subq $5,$3,$3 |
| cmpult $5,$3,$5 |
| stq $3,0($16) |
| addq $0,$5,$0 |
| ret $31,($26),1 |
| |
| .end _gcry_mpih_submul_1 |
| |
