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diff --git a/ports/sysdeps/vax/add_n.s b/ports/sysdeps/vax/add_n.s
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+++ b/ports/sysdeps/vax/add_n.s
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+# VAX __mpn_add_n -- Add two limb vectors of the same length > 0 and store
+# sum in a third limb vector.
+
+# Copyright (C) 1992, 1994 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.
+
+
+# INPUT PARAMETERS
+# res_ptr	(sp + 4)
+# s1_ptr	(sp + 8)
+# s2_ptr	(sp + 12)
+# size		(sp + 16)
+
+.text
+	.align 1
+.globl ___mpn_add_n
+___mpn_add_n:
+	.word	0x0
+	movl	16(ap),r0
+	movl	12(ap),r1
+	movl	8(ap),r2
+	movl	4(ap),r3
+	subl2	r4,r4
+
+Loop:
+	movl	(r2)+,r4
+	adwc	(r1)+,r4
+	movl	r4,(r3)+
+	jsobgtr	r0,Loop
+
+	adwc	r0,r0
+	ret