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diff --git a/rts/gmp/mpn/z8000/sub_n.s b/rts/gmp/mpn/z8000/sub_n.s
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+! Z8000 __gmpn_sub_n -- Subtract two limb vectors of the same length > 0 and
+! store difference in a third limb vector.
+
+! Copyright (C) 1993, 1994, 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 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	r7
+! s1_ptr	r6
+! s2_ptr	r5
+! size		r4
+
+! If we are really crazy, we can use push to write a few result words
+! backwards, using push just because it is faster than reg+disp.  We'd
+! then add 2x the number of words written to r7...
+
+	unseg
+	.text
+	even
+	global ___gmpn_sub_n
+___gmpn_sub_n:
+	pop	r0,@r6
+	pop	r1,@r5
+	sub	r0,r1
+	ld	@r7,r0
+	dec	r4
+	jr	eq,Lend
+Loop:	pop	r0,@r6
+	pop	r1,@r5
+	sbc	r0,r1
+	inc	r7,#2
+	ld	@r7,r0
+	dec	r4
+	jr	ne,Loop
+Lend:	ld	r2,r4		! use 0 already in r4
+	adc	r2,r2
+	ret	t