1/* mips3 sub_n -- Subtract two limb vectors of the same length > 0 and 2 * store difference in a third limb vector. 3 * 4 * Copyright (C) 1995, 1998, 1999, 2000, 5 * 2001, 2002 Free Software Foundation, Inc. 6 * 7 * This file is part of Libgcrypt. 8 * 9 * Libgcrypt is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU Lesser General Public License as 11 * published by the Free Software Foundation; either version 2.1 of 12 * the License, or (at your option) any later version. 13 * 14 * Libgcrypt is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU Lesser General Public License for more details. 18 * 19 * You should have received a copy of the GNU Lesser General Public 20 * License along with this program; if not, write to the Free Software 21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA 22 */ 23 24 25/******************* 26 * mpi_limb_t 27 * _gcry_mpih_sub_n( mpi_ptr_t res_ptr, (r4) 28 * mpi_ptr_t s1_ptr, (r5) 29 * mpi_ptr_t s2_ptr, (r6) 30 * mpi_size_t size) (r7) 31 */ 32 33 34 .text 35 .align 2 36 .globl _gcry_mpih_sub_n 37 .ent _gcry_mpih_sub_n 38_gcry_mpih_sub_n: 39 .set noreorder 40 .set nomacro 41 42 ld $10,0($5) 43 ld $11,0($6) 44 45 daddiu $7,$7,-1 46 and $9,$7,4-1 # number of limbs in first loop 47 beq $9,$0,.L0 # if multiple of 4 limbs, skip first loop 48 move $2,$0 49 50 dsubu $7,$7,$9 51 52.Loop0: daddiu $9,$9,-1 53 ld $12,8($5) 54 daddu $11,$11,$2 55 ld $13,8($6) 56 sltu $8,$11,$2 57 dsubu $11,$10,$11 58 sltu $2,$10,$11 59 sd $11,0($4) 60 or $2,$2,$8 61 62 daddiu $5,$5,8 63 daddiu $6,$6,8 64 move $10,$12 65 move $11,$13 66 bne $9,$0,.Loop0 67 daddiu $4,$4,8 68 69.L0: beq $7,$0,.Lend 70 nop 71 72.Loop: daddiu $7,$7,-4 73 74 ld $12,8($5) 75 daddu $11,$11,$2 76 ld $13,8($6) 77 sltu $8,$11,$2 78 dsubu $11,$10,$11 79 sltu $2,$10,$11 80 sd $11,0($4) 81 or $2,$2,$8 82 83 ld $10,16($5) 84 daddu $13,$13,$2 85 ld $11,16($6) 86 sltu $8,$13,$2 87 dsubu $13,$12,$13 88 sltu $2,$12,$13 89 sd $13,8($4) 90 or $2,$2,$8 91 92 ld $12,24($5) 93 daddu $11,$11,$2 94 ld $13,24($6) 95 sltu $8,$11,$2 96 dsubu $11,$10,$11 97 sltu $2,$10,$11 98 sd $11,16($4) 99 or $2,$2,$8 100 101 ld $10,32($5) 102 daddu $13,$13,$2 103 ld $11,32($6) 104 sltu $8,$13,$2 105 dsubu $13,$12,$13 106 sltu $2,$12,$13 107 sd $13,24($4) 108 or $2,$2,$8 109 110 daddiu $5,$5,32 111 daddiu $6,$6,32 112 113 bne $7,$0,.Loop 114 daddiu $4,$4,32 115 116.Lend: daddu $11,$11,$2 117 sltu $8,$11,$2 118 dsubu $11,$10,$11 119 sltu $2,$10,$11 120 sd $11,0($4) 121 j $31 122 or $2,$2,$8 123 124 .end _gcry_mpih_sub_n 125 126