diff options
Diffstat (limited to 'comm/third_party/libgcrypt/mpi/amd64/mpih-rshift.S')
| -rw-r--r-- | comm/third_party/libgcrypt/mpi/amd64/mpih-rshift.S | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/comm/third_party/libgcrypt/mpi/amd64/mpih-rshift.S b/comm/third_party/libgcrypt/mpi/amd64/mpih-rshift.S new file mode 100644 index 0000000000..d5e27974ed --- /dev/null +++ b/comm/third_party/libgcrypt/mpi/amd64/mpih-rshift.S @@ -0,0 +1,82 @@ +/* AMD64 (x86_64) rshift -- Right shift a limb vector and store + * result in a second 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_rshift( mpi_ptr_t wp, rdi + * mpi_ptr_t up, rsi + * mpi_size_t usize, rdx + * unsigned cnt) rcx + */ + +.text + .globl C_SYMBOL_NAME(_gcry_mpih_rshift) +C_SYMBOL_NAME(_gcry_mpih_rshift:) + FUNC_ENTRY() + /* Note: %xmm6 and %xmm7 not used for WIN64 ABI compatibility. */ + movq (%rsi), %xmm4 + movd %ecx, %xmm1 + movl $64, %eax + subl %ecx, %eax + movd %eax, %xmm0 + movdqa %xmm4, %xmm3 + psllq %xmm0, %xmm4 + movd %xmm4, %rax + leaq (%rsi,%rdx,8), %rsi + leaq (%rdi,%rdx,8), %rdi + negq %rdx + addq $2, %rdx + jg .Lendo + + ALIGN(4) /* minimal alignment for claimed speed */ +.Loop: movq -8(%rsi,%rdx,8), %xmm5 + movdqa %xmm5, %xmm2 + psllq %xmm0, %xmm5 + psrlq %xmm1, %xmm3 + por %xmm5, %xmm3 + movq %xmm3, -16(%rdi,%rdx,8) + je .Lende + movq (%rsi,%rdx,8), %xmm4 + movdqa %xmm4, %xmm3 + psllq %xmm0, %xmm4 + psrlq %xmm1, %xmm2 + por %xmm4, %xmm2 + movq %xmm2, -8(%rdi,%rdx,8) + addq $2, %rdx + jle .Loop + +.Lendo: movdqa %xmm3, %xmm2 +.Lende: psrlq %xmm1, %xmm2 + movq %xmm2, -8(%rdi) + FUNC_EXIT() + ret |