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diff --git a/gmp/mpn/x86/pentium/mul_1.asm b/gmp/mpn/x86/pentium/mul_1.asm
new file mode 100644
index 00000000..c6b255c3
--- /dev/null
+++ b/gmp/mpn/x86/pentium/mul_1.asm
@@ -0,0 +1,166 @@
+dnl  Intel Pentium mpn_mul_1 -- mpn by limb multiplication.
+
+dnl  Copyright 1992, 1994, 1996, 1999, 2000, 2002 Free Software Foundation,
+dnl  Inc.
+dnl
+dnl  This file is part of the GNU MP Library.
+dnl
+dnl  The GNU MP Library is free software; you can redistribute it and/or
+dnl  modify it under the terms of the GNU Lesser General Public License as
+dnl  published by the Free Software Foundation; either version 3 of the
+dnl  License, or (at your option) any later version.
+dnl
+dnl  The GNU MP Library is distributed in the hope that it will be useful,
+dnl  but WITHOUT ANY WARRANTY; without even the implied warranty of
+dnl  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+dnl  Lesser General Public License for more details.
+dnl
+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 P5: 12.0 cycles/limb
+
+
+C mp_limb_t mpn_mul_1 (mp_ptr dst, mp_srcptr src, mp_size_t size,
+C                      mp_limb_t multiplier);
+C mp_limb_t mpn_mul_1c (mp_ptr dst, mp_srcptr src, mp_size_t size,
+C                       mp_limb_t multiplier, mp_limb_t carry);
+C
+
+defframe(PARAM_CARRY,     20)
+defframe(PARAM_MULTIPLIER,16)
+defframe(PARAM_SIZE,      12)
+defframe(PARAM_SRC,       8)
+defframe(PARAM_DST,       4)
+
+	TEXT
+	ALIGN(8)
+PROLOGUE(mpn_mul_1c)
+deflit(`FRAME',0)
+
+	movl	PARAM_CARRY, %ecx
+	pushl	%esi		FRAME_pushl()
+
+	jmp	L(start_1c)
+
+EPILOGUE()
+
+
+	ALIGN(8)
+PROLOGUE(mpn_mul_1)
+deflit(`FRAME',0)
+
+	xorl	%ecx, %ecx
+	pushl	%esi		FRAME_pushl()
+
+L(start_1c):
+	movl	PARAM_SRC, %esi
+	movl	PARAM_SIZE, %eax
+
+	shrl	%eax
+	jnz	L(two_or_more)
+
+
+	C one limb only
+
+	movl	(%esi), %eax
+
+	mull	PARAM_MULTIPLIER
+
+	addl	%eax, %ecx
+	movl	PARAM_DST, %eax
+
+	adcl	$0, %edx
+	popl	%esi
+
+	movl	%ecx, (%eax)
+	movl	%edx, %eax
+
+	ret
+
+
+L(two_or_more):
+	C eax	size/2
+	C ebx
+	C ecx	carry
+	C edx
+	C esi	src
+	C edi
+	C ebp
+
+	pushl	%edi		FRAME_pushl()
+	pushl	%ebx		FRAME_pushl()
+
+	movl	PARAM_DST, %edi
+	leal	-1(%eax), %ebx		C size/2-1
+
+	notl	%ebx			C -size, preserve carry
+
+	leal	(%esi,%eax,8), %esi	C src end
+	leal	(%edi,%eax,8), %edi	C dst end
+
+	pushl	%ebp		FRAME_pushl()
+	jnc	L(top)
+
+
+	C size was odd, process one limb separately
+
+	movl	(%esi,%ebx,8), %eax
+	addl	$4, %esi
+
+	mull	PARAM_MULTIPLIER
+
+	addl	%ecx, %eax
+	movl	%edx, %ecx
+
+	movl	%eax, (%edi,%ebx,8)
+	leal	4(%edi), %edi
+
+
+L(top):
+	C eax
+	C ebx	counter, negative
+	C ecx	carry
+	C edx
+	C esi	src end
+	C edi	dst end
+	C ebp
+
+	adcl	$0, %ecx
+	movl	(%esi,%ebx,8), %eax
+
+	mull	PARAM_MULTIPLIER
+
+	movl	%edx, %ebp
+	addl	%eax, %ecx
+
+	adcl	$0, %ebp
+	movl	4(%esi,%ebx,8), %eax
+
+	mull	PARAM_MULTIPLIER
+
+	movl	%ecx, (%edi,%ebx,8)
+	addl	%ebp, %eax
+
+	movl	%eax, 4(%edi,%ebx,8)
+	incl	%ebx
+
+	movl	%edx, %ecx
+	jnz	L(top)
+
+
+	adcl	$0, %ecx
+	popl	%ebp
+
+	movl	%ecx, %eax
+	popl	%ebx
+
+	popl	%edi
+	popl	%esi
+
+	ret
+
+EPILOGUE()