67 lines
2 KiB
ArmAsm
67 lines
2 KiB
ArmAsm
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/* AMD64 submul_1 -- Multiply a limb vector with a limb and add
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* the result to a second limb vector.
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*
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* Copyright (C) 1992, 1994, 1998,
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* 2001, 2002, 2006 Free Software Foundation, Inc.
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*
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* This file is part of Libgcrypt.
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*
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* Libgcrypt is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* Libgcrypt 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License 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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* Note: This code is heavily based on the GNU MP Library.
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* Actually it's the same code with only minor changes in the
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* way the data is stored; this is to support the abstraction
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* of an optional secure memory allocation which may be used
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* to avoid revealing of sensitive data due to paging etc.
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*/
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#include "sysdep.h"
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#include "asm-syntax.h"
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/*******************
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* mpi_limb_t
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* _gcry_mpih_submul_1( mpi_ptr_t res_ptr, (rdi)
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* mpi_ptr_t s1_ptr, (rsi)
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* mpi_size_t s1_size, (rdx)
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* mpi_limb_t s2_limb) (rcx)
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*/
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TEXT
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GLOBL C_SYMBOL_NAME(_gcry_mpih_submul_1)
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C_SYMBOL_NAME(_gcry_mpih_submul_1:)
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movq %rdx, %r11
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leaq (%rsi,%r11,8), %rsi
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leaq (%rdi,%r11,8), %rdi
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negq %r11
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xorl %r8d, %r8d
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ALIGN(3) /* minimal alignment for claimed speed */
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.Loop: movq (%rsi,%r11,8), %rax
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movq (%rdi,%r11,8), %r10
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mulq %rcx
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subq %r8, %r10
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movl $0, %r8d
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adcl %r8d, %r8d
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subq %rax, %r10
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adcq %rdx, %r8
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movq %r10, (%rdi,%r11,8)
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incq %r11
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jne .Loop
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movq %r8, %rax
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ret
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