mpn_add_n for x86-64.

diff --git a/sysdeps/x86_64/add_n.S b/sysdeps/x86_64/add_n.S
new file mode 100644 (file)
index 0000000..7883f6c
--- /dev/null
+++ b/sysdeps/x86_64/add_n.S
@@ -0,0 +1,42 @@
+/* Add two limb vectors of the same length > 0 and store sum in a third
+   limb vector.
+   Copyright (C) 2004 Free Software Foundation, Inc.
+   This file is part of the GNU MP Library.
+
+   The GNU MP Library 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.
+
+   The GNU MP Library 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 the GNU MP Library; see the file COPYING.LIB.  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"
+
+       .text
+ENTRY (__mpn_add_n)
+       leaq    (%rsi,%rcx,8), %rsi
+       leaq    (%rdi,%rcx,8), %rdi
+       leaq    (%rdx,%rcx,8), %rdx
+       negq    %rcx
+       xorl    %eax, %eax                      # clear cy
+       .p2align 2
+L(loop):
+       movq    (%rsi,%rcx,8), %rax
+       movq    (%rdx,%rcx,8), %r10
+       adcq    %r10, %rax
+       movq    %rax, (%rdi,%rcx,8)
+       incq    %rcx
+       jne     L(loop)
+       movq    %rcx, %rax                      # zero %rax
+       adcq    %rax, %rax
+       ret
+END (__mpn_add_n)