| /* Intel Pentium-4 mpn_mul_1 -- Multiply a limb vector with a limb and store |
| * the result in a second limb vector. |
| * |
| * Copyright 2001, 2002, 2003, 2005 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_mul_1( mpi_ptr_t res_ptr, (sp + 4) |
| * mpi_ptr_t s1_ptr, (sp + 8) |
| * mpi_size_t s1_size, (sp + 12) |
| * mpi_limb_t s2_limb) (sp + 16) |
| * |
| * src != dst src == dst |
| * P6 model 9 (Banias) ?.? |
| * P6 model 13 (Dothan) 4.75 4.75 |
| * P4 model 0 (Willamette) 4.0 6.0 |
| * P4 model 1 (?) 4.0 6.0 |
| * P4 model 2 (Northwood) 4.0 6.0 |
| * P4 model 3 (Prescott) ?.? ?.? |
| * P4 model 4 (Nocona) ?.? ?.? |
| * Unfortunately when src==dst the write-combining described in |
| * pentium4/README takes us up to 6 c/l. |
| * |
| */ |
| |
| TEXT |
| ALIGN (3) |
| GLOBL C_SYMBOL_NAME(_gcry_mpih_mul_1) |
| C_SYMBOL_NAME(_gcry_mpih_mul_1:); |
| |
| pxor %mm0, %mm0 |
| |
| .Lstart_1c: |
| movl 8(%esp), %eax |
| movd 16(%esp), %mm7 |
| movl 4(%esp), %edx |
| movl 12(%esp), %ecx |
| |
| .Ltop: |
| |
| /* |
| C eax src, incrementing |
| C ebx |
| C ecx counter, size iterations |
| C edx dst, incrementing |
| C |
| C mm0 carry limb |
| C mm7 multiplier |
| */ |
| |
| movd (%eax), %mm1 |
| addl $4, %eax |
| pmuludq %mm7, %mm1 |
| |
| paddq %mm1, %mm0 |
| movd %mm0, (%edx) |
| addl $4, %edx |
| |
| psrlq $32, %mm0 |
| |
| subl $1, %ecx |
| jnz .Ltop |
| |
| |
| movd %mm0, %eax |
| emms |
| ret |
| |
