| /* i80586 add_n -- Add two limb vectors of the same length > 0 and store |
| * sum in a third limb vector. |
| * |
| * Copyright (C) 1992, 1994, 1995, 1996, 1998, |
| * 2001, 2002 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 |
| */ |
| |
| |
| #include "sysdep.h" |
| #include "asm-syntax.h" |
| |
| |
| /******************* |
| * mpi_limb_t |
| * _gcry_mpih_add_n( mpi_ptr_t res_ptr, (sp + 4) |
| * mpi_ptr_t s1_ptr, (sp + 8) |
| * mpi_ptr_t s2_ptr, (sp + 12) |
| * mpi_size_t size) (sp + 16) |
| */ |
| |
| .text |
| ALIGN (3) |
| .globl C_SYMBOL_NAME(_gcry_mpih_add_n) |
| C_SYMBOL_NAME(_gcry_mpih_add_n:) |
| pushl %edi |
| pushl %esi |
| pushl %ebx |
| pushl %ebp |
| |
| movl 20(%esp),%edi /* res_ptr */ |
| movl 24(%esp),%esi /* s1_ptr */ |
| movl 28(%esp),%ebp /* s2_ptr */ |
| movl 32(%esp),%ecx /* size */ |
| |
| movl (%ebp),%ebx |
| |
| decl %ecx |
| movl %ecx,%edx |
| shrl $3,%ecx |
| andl $7,%edx |
| testl %ecx,%ecx /* zero carry flag */ |
| jz Lend |
| pushl %edx |
| |
| ALIGN (3) |
| Loop: movl 28(%edi),%eax /* fetch destination cache line */ |
| leal 32(%edi),%edi |
| |
| L1: movl (%esi),%eax |
| movl 4(%esi),%edx |
| adcl %ebx,%eax |
| movl 4(%ebp),%ebx |
| adcl %ebx,%edx |
| movl 8(%ebp),%ebx |
| movl %eax,-32(%edi) |
| movl %edx,-28(%edi) |
| |
| L2: movl 8(%esi),%eax |
| movl 12(%esi),%edx |
| adcl %ebx,%eax |
| movl 12(%ebp),%ebx |
| adcl %ebx,%edx |
| movl 16(%ebp),%ebx |
| movl %eax,-24(%edi) |
| movl %edx,-20(%edi) |
| |
| L3: movl 16(%esi),%eax |
| movl 20(%esi),%edx |
| adcl %ebx,%eax |
| movl 20(%ebp),%ebx |
| adcl %ebx,%edx |
| movl 24(%ebp),%ebx |
| movl %eax,-16(%edi) |
| movl %edx,-12(%edi) |
| |
| L4: movl 24(%esi),%eax |
| movl 28(%esi),%edx |
| adcl %ebx,%eax |
| movl 28(%ebp),%ebx |
| adcl %ebx,%edx |
| movl 32(%ebp),%ebx |
| movl %eax,-8(%edi) |
| movl %edx,-4(%edi) |
| |
| leal 32(%esi),%esi |
| leal 32(%ebp),%ebp |
| decl %ecx |
| jnz Loop |
| |
| popl %edx |
| Lend: |
| decl %edx /* test %edx w/o clobbering carry */ |
| js Lend2 |
| incl %edx |
| Loop2: |
| leal 4(%edi),%edi |
| movl (%esi),%eax |
| adcl %ebx,%eax |
| movl 4(%ebp),%ebx |
| movl %eax,-4(%edi) |
| leal 4(%esi),%esi |
| leal 4(%ebp),%ebp |
| decl %edx |
| jnz Loop2 |
| Lend2: |
| movl (%esi),%eax |
| adcl %ebx,%eax |
| movl %eax,(%edi) |
| |
| sbbl %eax,%eax |
| negl %eax |
| |
| popl %ebp |
| popl %ebx |
| popl %esi |
| popl %edi |
| ret |
| |
| |
