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diff --git a/gmp/mpn/mips64/add_n.asm b/gmp/mpn/mips64/add_n.asm
new file mode 100644
index 00000000..1a3978c3
--- /dev/null
+++ b/gmp/mpn/mips64/add_n.asm
@@ -0,0 +1,112 @@
+dnl  MIPS64 mpn_add_n -- Add two limb vectors of the same length > 0 and store
+dnl  sum in a third limb vector.
+
+dnl  Copyright 1995, 2000, 2001, 2002 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
+dnl  by the Free Software Foundation; either version 3 of the License, or (at
+dnl  your 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.  If not, see http://www.gnu.org/licenses/.
+
+include(`../config.m4')
+
+C INPUT PARAMETERS
+C res_ptr	$4
+C s1_ptr	$5
+C s2_ptr	$6
+C size		$7
+
+ASM_START()
+PROLOGUE(mpn_add_n)
+	ld	$10,0($5)
+	ld	$11,0($6)
+
+	daddiu	$7,$7,-1
+	and	$9,$7,4-1	C number of limbs in first loop
+	beq	$9,$0,.L0	C if multiple of 4 limbs, skip first loop
+	 move	$2,$0
+
+	dsubu	$7,$7,$9
+
+.Loop0:	daddiu	$9,$9,-1
+	ld	$12,8($5)
+	daddu	$11,$11,$2
+	ld	$13,8($6)
+	sltu	$8,$11,$2
+	daddu	$11,$10,$11
+	sltu	$2,$11,$10
+	sd	$11,0($4)
+	or	$2,$2,$8
+
+	daddiu	$5,$5,8
+	daddiu	$6,$6,8
+	move	$10,$12
+	move	$11,$13
+	bne	$9,$0,.Loop0
+	 daddiu	$4,$4,8
+
+.L0:	beq	$7,$0,.Lend
+	 nop
+
+.Loop:	daddiu	$7,$7,-4
+
+	ld	$12,8($5)
+	daddu	$11,$11,$10
+	ld	$13,8($6)
+	sltu	$8,$11,$10
+	daddu	$11,$11,$2
+	sltu	$2,$11,$2
+	sd	$11,0($4)
+	or	$2,$2,$8
+
+	ld	$10,16($5)
+	daddu	$13,$13,$12
+	ld	$11,16($6)
+	sltu	$8,$13,$12
+	daddu	$13,$13,$2
+	sltu	$2,$13,$2
+	sd	$13,8($4)
+	or	$2,$2,$8
+
+	ld	$12,24($5)
+	daddu	$11,$11,$10
+	ld	$13,24($6)
+	sltu	$8,$11,$10
+	daddu	$11,$11,$2
+	sltu	$2,$11,$2
+	sd	$11,16($4)
+	or	$2,$2,$8
+
+	ld	$10,32($5)
+	daddu	$13,$13,$12
+	ld	$11,32($6)
+	sltu	$8,$13,$12
+	daddu	$13,$13,$2
+	sltu	$2,$13,$2
+	sd	$13,24($4)
+	or	$2,$2,$8
+
+	daddiu	$5,$5,32
+	daddiu	$6,$6,32
+
+	bne	$7,$0,.Loop
+	 daddiu	$4,$4,32
+
+.Lend:	daddu	$11,$11,$2
+	sltu	$8,$11,$2
+	daddu	$11,$10,$11
+	sltu	$2,$11,$10
+	sd	$11,0($4)
+	j	$31
+	or	$2,$2,$8
+EPILOGUE(mpn_add_n)