81 lines
2.2 KiB
ArmAsm
81 lines
2.2 KiB
ArmAsm
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/* AMD64 (x86_64) rshift -- Right shift a limb vector and store
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* result in a second limb vector.
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*
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* Copyright (C) 1992, 1994, 1995, 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_rshift( mpi_ptr_t wp, rdi
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* mpi_ptr_t up, rsi
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* mpi_size_t usize, rdx
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* unsigned cnt) rcx
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*/
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.text
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.globl C_SYMBOL_NAME(_gcry_mpih_rshift)
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C_SYMBOL_NAME(_gcry_mpih_rshift:)
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movq (%rsi), %mm7
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movd %ecx, %mm1
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movl $64, %eax
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subl %ecx, %eax
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movd %eax, %mm0
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movq %mm7, %mm3
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psllq %mm0, %mm7
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movd %mm7, %rax
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leaq (%rsi,%rdx,8), %rsi
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leaq (%rdi,%rdx,8), %rdi
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negq %rdx
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addq $2, %rdx
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jg .Lendo
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ALIGN(8) /* minimal alignment for claimed speed */
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.Loop: movq -8(%rsi,%rdx,8), %mm6
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movq %mm6, %mm2
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psllq %mm0, %mm6
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psrlq %mm1, %mm3
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por %mm6, %mm3
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movq %mm3, -16(%rdi,%rdx,8)
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je .Lende
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movq (%rsi,%rdx,8), %mm7
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movq %mm7, %mm3
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psllq %mm0, %mm7
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psrlq %mm1, %mm2
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por %mm7, %mm2
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movq %mm2, -8(%rdi,%rdx,8)
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addq $2, %rdx
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jle .Loop
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.Lendo: movq %mm3, %mm2
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.Lende: psrlq %mm1, %mm2
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movq %mm2, -8(%rdi)
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emms
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ret
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