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- /* AMD64 (x86_64) sub_n -- Subtract two limb vectors of the same length > 0 and store
- * sum in a third limb vector.
- *
- * Copyright (C) 1992, 1994, 1995, 1998,
- * 2001, 2002, 2006 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
- *
- * Note: This code is heavily based on the GNU MP Library.
- * Actually it's the same code with only minor changes in the
- * way the data is stored; this is to support the abstraction
- * of an optional secure memory allocation which may be used
- * to avoid revealing of sensitive data due to paging etc.
- */
- #include "sysdep.h"
- #include "asm-syntax.h"
- /*******************
- * mpi_limb_t
- * _gcry_mpih_sub_n( mpi_ptr_t res_ptr, rdi
- * mpi_ptr_t s1_ptr, rsi
- * mpi_ptr_t s2_ptr, rdx
- * mpi_size_t size) rcx
- */
- .text
- .globl C_SYMBOL_NAME(_gcry_mpih_sub_n)
- C_SYMBOL_NAME(_gcry_mpih_sub_n:)
- leaq (%rsi,%rcx,8), %rsi
- leaq (%rdi,%rcx,8), %rdi
- leaq (%rdx,%rcx,8), %rdx
- negq %rcx
- xorl %eax, %eax /* clear cy */
- ALIGN(4) /* minimal alignment for claimed speed */
- .Loop: movq (%rsi,%rcx,8), %rax
- movq (%rdx,%rcx,8), %r10
- sbbq %r10, %rax
- movq %rax, (%rdi,%rcx,8)
- incq %rcx
- jne .Loop
- movq %rcx, %rax /* zero %rax */
- adcq %rax, %rax
- ret
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