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diff --git a/rts/gmp/mpn/powerpc64/submul_1.asm b/rts/gmp/mpn/powerpc64/submul_1.asm
new file mode 100644
index 0000000..17f6369
--- /dev/null
+++ b/rts/gmp/mpn/powerpc64/submul_1.asm
@@ -0,0 +1,54 @@
+# PowerPC-64 mpn_submul_1 -- Multiply a limb vector with a limb and subtract
+# the result from a second limb vector.
+
+# Copyright (C) 1999, 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	r3
+# s1_ptr	r4
+# size		r5
+# s2_limb	r6
+
+include(`../config.m4')
+
+ASM_START()
+PROLOGUE(mpn_submul_1)
+	mtctr	5
+	li	9,0		# cy_limb = 0
+	addic	0,0,0
+	cal	3,-8(3)
+	cal	4,-8(4)
+.Loop:
+	ldu	0,8(4)
+	ld	10,8(3)
+	mulld	7,0,6
+	adde	7,7,9
+	mulhdu	9,0,6
+	addze	9,9
+	subfc	7,7,10
+	stdu	7,8(3)
+	subfe	11,11,11	# invert ...
+	addic	11,11,1		# ... carry
+	bdnz	.Loop
+
+	addze	3,9
+	blr
+EPILOGUE(mpn_submul_1)