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diff --git a/gmp/mpn/mips64/submul_1.asm b/gmp/mpn/mips64/submul_1.asm
new file mode 100644
index 00000000..11e17370
--- /dev/null
+++ b/gmp/mpn/mips64/submul_1.asm
@@ -0,0 +1,91 @@
+dnl  MIPS64 mpn_submul_1 -- Multiply a limb vector with a single limb and
+dnl  subtract the product from a second limb vector.
+
+dnl  Copyright 1992, 1994, 1995, 2000, 2001, 2002 Free Software Foundation,
+dnl  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 size		$6
+C s2_limb	$7
+
+ASM_START()
+PROLOGUE(mpn_submul_1)
+
+C feed-in phase 0
+	ld	$8,0($5)
+
+C feed-in phase 1
+	daddiu	$5,$5,8
+	dmultu	$8,$7
+
+	daddiu	$6,$6,-1
+	beq	$6,$0,$LC0
+	 move	$2,$0		C zero cy2
+
+	daddiu	$6,$6,-1
+	beq	$6,$0,$LC1
+	ld	$8,0($5)	C load new s1 limb as early as possible
+
+Loop:	ld	$10,0($4)
+	mflo	$3
+	mfhi	$9
+	daddiu	$5,$5,8
+	daddu	$3,$3,$2	C add old carry limb to low product limb
+	dmultu	$8,$7
+	ld	$8,0($5)	C load new s1 limb as early as possible
+	daddiu	$6,$6,-1	C decrement loop counter
+	sltu	$2,$3,$2	C carry from previous addition -> $2
+	dsubu	$3,$10,$3
+	sgtu	$10,$3,$10
+	daddu	$2,$2,$10
+	sd	$3,0($4)
+	daddiu	$4,$4,8
+	bne	$6,$0,Loop
+	 daddu	$2,$9,$2	C add high product limb and carry from addition
+
+C wind-down phase 1
+$LC1:	ld	$10,0($4)
+	mflo	$3
+	mfhi	$9
+	daddu	$3,$3,$2
+	sltu	$2,$3,$2
+	dmultu	$8,$7
+	dsubu	$3,$10,$3
+	sgtu	$10,$3,$10
+	daddu	$2,$2,$10
+	sd	$3,0($4)
+	daddiu	$4,$4,8
+	daddu	$2,$9,$2	C add high product limb and carry from addition
+
+C wind-down phase 0
+$LC0:	ld	$10,0($4)
+	mflo	$3
+	mfhi	$9
+	daddu	$3,$3,$2
+	sltu	$2,$3,$2
+	dsubu	$3,$10,$3
+	sgtu	$10,$3,$10
+	daddu	$2,$2,$10
+	sd	$3,0($4)
+	j	$31
+	daddu	$2,$9,$2	C add high product limb and carry from addition
+EPILOGUE(mpn_submul_1)