1/* AMD64 (x86_64) add_n -- Add two limb vectors of the same length > 0 and store 2 * sum in a third limb vector. 3 * 4 * Copyright (C) 1992, 1994, 1995, 1998, 5 * 2001, 2002, 2006 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 * Note: This code is heavily based on the GNU MP Library. 24 * Actually it's the same code with only minor changes in the 25 * way the data is stored; this is to support the abstraction 26 * of an optional secure memory allocation which may be used 27 * to avoid revealing of sensitive data due to paging etc. 28 */ 29 30 31#include "sysdep.h" 32#include "asm-syntax.h" 33 34 35/******************* 36 * mpi_limb_t 37 * _gcry_mpih_add_n( mpi_ptr_t res_ptr, rdi 38 * mpi_ptr_t s1_ptr, rsi 39 * mpi_ptr_t s2_ptr, rdx 40 * mpi_size_t size) rcx 41 */ 42 43.text 44 .globl C_SYMBOL_NAME(_gcry_mpih_add_n) 45C_SYMBOL_NAME(_gcry_mpih_add_n:) 46 leaq (%rsi,%rcx,8), %rsi 47 leaq (%rdi,%rcx,8), %rdi 48 leaq (%rdx,%rcx,8), %rdx 49 negq %rcx 50 xorl %eax, %eax /* clear cy */ 51 52 ALIGN(4) /* minimal alignment for claimed speed */ 53.Loop: movq (%rsi,%rcx,8), %rax 54 movq (%rdx,%rcx,8), %r10 55 adcq %r10, %rax 56 movq %rax, (%rdi,%rcx,8) 57 incq %rcx 58 jne .Loop 59 60 movq %rcx, %rax /* zero %rax */ 61 adcq %rax, %rax 62 ret 63