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diff --git a/gmp/mpn/sh/add_n.s b/gmp/mpn/sh/add_n.s
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+! SH __gmpn_add_n -- Add two limb vectors of the same length > 0 and store
+! sum in a third limb vector.
+
+! Copyright 1995, 1997, 2000 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 3 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.  If not, see http://www.gnu.org/licenses/.
+
+
+! INPUT PARAMETERS
+! res_ptr	r4
+! s1_ptr	r5
+! s2_ptr	r6
+! size		r7
+
+	.text
+	.align 2
+	.global	___gmpn_add_n
+___gmpn_add_n:
+	mov	#0,r3		! clear cy save reg
+
+Loop:	mov.l	@r5+,r1
+	mov.l	@r6+,r2
+	shlr	r3		! restore cy
+	addc	r2,r1
+	movt	r3		! save cy
+	mov.l	r1,@r4
+	dt	r7
+	bf.s	Loop
+	 add	#4,r4
+
+	rts
+	mov	r3,r0		! return carry-out from most sign. limb