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diff --git a/contrib/libgmp/mpn/sparc64/sub_n.s b/contrib/libgmp/mpn/sparc64/sub_n.s
new file mode 100644
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+! SPARC v9 __mpn_sub_n -- Subtract two limb vectors of the same length > 0 and
+! store difference in a third limb vector.
+
+! Copyright (C) 1995, 1996 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 Library General Public License as published by
+! the Free Software Foundation; either version 2 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 Library General Public
+! License for more details.
+
+! You should have received a copy of the GNU Library 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	%o0
+! s1_ptr	%o1
+! s2_ptr	%o2
+! size		%o3
+
+.section	".text"
+	.align 4
+	.global __mpn_sub_n
+	.type	 __mpn_sub_n,#function
+	.proc	04
+__mpn_sub_n:
+	sub %g0,%o3,%g3
+	sllx %o3,3,%g1
+	add %o1,%g1,%o1			! make s1_ptr point at end
+	add %o2,%g1,%o2			! make s2_ptr point at end
+	add %o0,%g1,%o0			! make res_ptr point at end
+	mov 0,%o4			! clear carry variable
+	sllx %g3,3,%o5			! compute initial address index
+
+.Loop:	ldx [%o2+%o5],%g1		! load s2 limb
+	add %g3,1,%g3			! increment loop count
+	ldx [%o1+%o5],%g2		! load s1 limb
+	addcc %g1,%o4,%g1		! add s2 limb and carry variable
+	movcc %xcc,0,%o4		! if carry-out, o4 was 1; clear it
+	subcc %g1,%g2,%g1		! subtract s1 limb from sum
+	stx %g1,[%o0+%o5]		! store result
+	add %o5,8,%o5			! increment address index
+	brnz,pt %g3,.Loop
+	movcs %xcc,1,%o4		! if s1 subtract gave carry, record it
+
+	retl
+	mov %o4,%o0
+.LLfe1:
+	.size	 __mpn_sub_n,.LLfe1-__mpn_sub_n