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diff --git a/ghc/rts/gmp/mpn/alpha/add_n.asm b/ghc/rts/gmp/mpn/alpha/add_n.asm
new file mode 100644
index 0000000..08d6a9f
--- /dev/null
+++ b/ghc/rts/gmp/mpn/alpha/add_n.asm
@@ -0,0 +1,114 @@
+dnl  Alpha mpn_add_n -- Add two limb vectors of the same length > 0 and
+dnl  store sum in a third limb vector.
+
+dnl  Copyright (C) 1995, 2000 Free Software Foundation, Inc.
+
+dnl  This file is part of the GNU MP Library.
+
+dnl  The GNU MP Library is free software; you can redistribute it and/or modify
+dnl  it under the terms of the GNU Lesser General Public License as published by
+dnl  the Free Software Foundation; either version 2.1 of the License, or (at your
+dnl  option) any later version.
+
+dnl  The GNU MP Library is distributed in the hope that it will be useful, but
+dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+dnl  License for more details.
+
+dnl  You should have received a copy of the GNU Lesser General Public License
+dnl  along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
+dnl  the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+dnl  MA 02111-1307, USA.
+
+include(`../config.m4')
+
+dnl  INPUT PARAMETERS
+dnl  res_ptr	r16
+dnl  s1_ptr	r17
+dnl  s2_ptr	r18
+dnl  size	r19
+
+ASM_START()
+PROLOGUE(mpn_add_n)
+	ldq	r3,0(r17)
+	ldq	r4,0(r18)
+
+	subq	r19,1,r19
+	and	r19,4-1,r2	C number of limbs in first loop
+	bis	r31,r31,r0
+	beq	r2,$L0		C if multiple of 4 limbs, skip first loop
+
+	subq	r19,r2,r19
+
+$Loop0:	subq	r2,1,r2
+	ldq	r5,8(r17)
+	addq	r4,r0,r4
+	ldq	r6,8(r18)
+	cmpult	r4,r0,r1
+	addq	r3,r4,r4
+	cmpult	r4,r3,r0
+	stq	r4,0(r16)
+	bis	r0,r1,r0
+
+	addq	r17,8,r17
+	addq	r18,8,r18
+	bis	r5,r5,r3
+	bis	r6,r6,r4
+	addq	r16,8,r16
+	bne	r2,$Loop0
+
+$L0:	beq	r19,$Lend
+
+	ALIGN(8)
+$Loop:	subq	r19,4,r19
+
+	ldq	r5,8(r17)
+	addq	r4,r0,r4
+	ldq	r6,8(r18)
+	cmpult	r4,r0,r1
+	addq	r3,r4,r4
+	cmpult	r4,r3,r0
+	stq	r4,0(r16)
+	bis	r0,r1,r0
+
+	ldq	r3,16(r17)
+	addq	r6,r0,r6
+	ldq	r4,16(r18)
+	cmpult	r6,r0,r1
+	addq	r5,r6,r6
+	cmpult	r6,r5,r0
+	stq	r6,8(r16)
+	bis	r0,r1,r0
+
+	ldq	r5,24(r17)
+	addq	r4,r0,r4
+	ldq	r6,24(r18)
+	cmpult	r4,r0,r1
+	addq	r3,r4,r4
+	cmpult	r4,r3,r0
+	stq	r4,16(r16)
+	bis	r0,r1,r0
+
+	ldq	r3,32(r17)
+	addq	r6,r0,r6
+	ldq	r4,32(r18)
+	cmpult	r6,r0,r1
+	addq	r5,r6,r6
+	cmpult	r6,r5,r0
+	stq	r6,24(r16)
+	bis	r0,r1,r0
+
+	addq	r17,32,r17
+	addq	r18,32,r18
+	addq	r16,32,r16
+	bne	r19,$Loop
+
+$Lend:	addq	r4,r0,r4
+	cmpult	r4,r0,r1
+	addq	r3,r4,r4
+	cmpult	r4,r3,r0
+	stq	r4,0(r16)
+	bis	r0,r1,r0
+	ret	r31,(r26),1
+EPILOGUE(mpn_add_n)
+ASM_END()