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diff --git a/rts/gmp/mpn/sparc64/rshift.asm b/rts/gmp/mpn/sparc64/rshift.asm
new file mode 100644
index 0000000..baf7920
--- /dev/null
+++ b/rts/gmp/mpn/sparc64/rshift.asm
@@ -0,0 +1,94 @@
+! SPARC v9 __gmpn_rshift --
+
+! Copyright (C) 1996, 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	%o0
+! src_ptr	%o1
+! size		%o2
+! cnt		%o3
+
+include(`../config.m4')
+
+ASM_START()
+	.register	%g2,#scratch
+	.register	%g3,#scratch
+PROLOGUE(mpn_rshift)
+	ldx	[%o1],%g2	! load first limb
+	sub	%g0,%o3,%o5	! negate shift count
+	add	%o2,-1,%o2
+	and	%o2,4-1,%g4	! number of limbs in first loop
+	sllx	%g2,%o5,%g1	! compute function result
+	brz,pn	%g4,L(0)	! if multiple of 4 limbs, skip first loop
+	mov	%g1,%g5
+
+	sub	%o2,%g4,%o2	! adjust count for main loop
+
+L(loop0):
+	ldx	[%o1+8],%g3
+	add	%o0,8,%o0
+	add	%o1,8,%o1
+	add	%g4,-1,%g4
+	srlx	%g2,%o3,%o4
+	sllx	%g3,%o5,%g1
+	mov	%g3,%g2
+	or	%o4,%g1,%o4
+	brnz,pt	%g4,L(loop0)
+	 stx	%o4,[%o0-8]
+
+L(0):	brz,pn	%o2,L(end)
+	 nop
+
+L(loop1):
+	ldx	[%o1+8],%g3
+	add	%o0,32,%o0
+	add	%o2,-4,%o2
+	srlx	%g2,%o3,%o4
+	sllx	%g3,%o5,%g1
+
+	ldx	[%o1+16],%g2
+	srlx	%g3,%o3,%g4
+	or	%o4,%g1,%o4
+	stx	%o4,[%o0-32]
+	sllx	%g2,%o5,%g1
+
+	ldx	[%o1+24],%g3
+	srlx	%g2,%o3,%o4
+	or	%g4,%g1,%g4
+	stx	%g4,[%o0-24]
+	sllx	%g3,%o5,%g1
+
+	ldx	[%o1+32],%g2
+	srlx	%g3,%o3,%g4
+	or	%o4,%g1,%o4
+	stx	%o4,[%o0-16]
+	sllx	%g2,%o5,%g1
+
+	add	%o1,32,%o1
+	or	%g4,%g1,%g4
+	brnz	%o2,L(loop1)
+	 stx	%g4,[%o0-8]
+
+L(end):	srlx	%g2,%o3,%g2
+	stx	%g2,[%o0-0]
+	retl
+	mov	%g5,%o0
+EPILOGUE(mpn_rshift)