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diff --git a/gmp/mpn/x86/p6/mode1o.asm b/gmp/mpn/x86/p6/mode1o.asm
new file mode 100644
index 00000000..4aff48d7
--- /dev/null
+++ b/gmp/mpn/x86/p6/mode1o.asm
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+dnl  Intel P6 mpn_modexact_1_odd -- exact division style remainder.
+
+dnl  Copyright 2000, 2001, 2002, 2007 Free Software Foundation, 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 P6: 10.0 cycles/limb
+
+
+C mp_limb_t mpn_modexact_1_odd (mp_srcptr src, mp_size_t size,
+C                               mp_limb_t divisor);
+C mp_limb_t mpn_modexact_1c_odd (mp_srcptr src, mp_size_t size,
+C                                mp_limb_t divisor, mp_limb_t carry);
+C
+C It's not worth skipping a step at the end when high<divisor since the main
+C loop is only 10 cycles.
+
+defframe(PARAM_CARRY,  16)
+defframe(PARAM_DIVISOR,12)
+defframe(PARAM_SIZE,   8)
+defframe(PARAM_SRC,    4)
+
+dnl  Not enough room under modexact_1 to make these re-use the parameter
+dnl  space, unfortunately.
+defframe(SAVE_EBX,     -4)
+defframe(SAVE_ESI,     -8)
+defframe(SAVE_EDI,    -12)
+deflit(STACK_SPACE, 12)
+
+	TEXT
+
+	ALIGN(16)
+PROLOGUE(mpn_modexact_1c_odd)
+deflit(`FRAME',0)
+
+	movl	PARAM_CARRY, %ecx
+	jmp	L(start_1c)
+
+EPILOGUE()
+
+	ALIGN(16)
+PROLOGUE(mpn_modexact_1_odd)
+deflit(`FRAME',0)
+
+	xorl	%ecx, %ecx
+L(start_1c):
+	movl	PARAM_DIVISOR, %eax
+
+	subl	$STACK_SPACE, %esp	FRAME_subl_esp(STACK_SPACE)
+
+	movl	%esi, SAVE_ESI
+	movl	PARAM_SRC, %esi
+
+	shrl	%eax			C d/2
+	movl	%edi, SAVE_EDI
+
+	andl	$127, %eax
+
+ifdef(`PIC',`
+	LEA(	binvert_limb_table, %edi)
+	movzbl	(%eax,%edi), %edi		C inv 8 bits
+',`
+	movzbl	binvert_limb_table(%eax), %edi	C inv 8 bits
+')
+
+	xorl	%edx, %edx		C initial extra carry
+	leal	(%edi,%edi), %eax	C 2*inv
+
+	imull	%edi, %edi		C inv*inv
+
+	movl	%ebx, SAVE_EBX
+	movl	PARAM_SIZE, %ebx
+
+	imull	PARAM_DIVISOR, %edi	C inv*inv*d
+
+	subl	%edi, %eax		C inv = 2*inv - inv*inv*d
+	leal	(%eax,%eax), %edi	C 2*inv
+
+	imull	%eax, %eax		C inv*inv
+
+	imull	PARAM_DIVISOR, %eax	C inv*inv*d
+
+	leal	(%esi,%ebx,4), %esi	C src end
+	negl	%ebx			C -size
+
+	subl	%eax, %edi		C inv = 2*inv - inv*inv*d
+
+	ASSERT(e,`	C d*inv == 1 mod 2^BITS_PER_MP_LIMB
+	movl	PARAM_DIVISOR, %eax
+	imull	%edi, %eax
+	cmpl	$1, %eax')
+
+
+C The dependent chain here is
+C
+C	subl	%edx, %eax       1
+C	imull	%edi, %eax       4
+C	mull	PARAM_DIVISOR    5
+C			       ----
+C       total		        10
+C
+C and this is the measured speed.  No special scheduling is necessary, out
+C of order execution hides the load latency.
+
+L(top):
+	C eax	scratch (src limb)
+	C ebx	counter, limbs, negative
+	C ecx	carry bit, 0 or 1
+	C edx	carry limb, high of last product
+	C esi	&src[size]
+	C edi	inverse
+	C ebp
+
+	movl	(%esi,%ebx,4), %eax
+	subl	%ecx, %eax
+
+	sbbl	%ecx, %ecx
+	subl	%edx, %eax
+
+	sbbl	$0, %ecx
+
+	imull	%edi, %eax
+
+	negl	%ecx
+
+	mull	PARAM_DIVISOR
+
+	incl	%ebx
+	jnz	L(top)
+
+
+	movl	SAVE_ESI, %esi
+	leal	(%ecx,%edx), %eax
+
+	movl	SAVE_EDI, %edi
+
+	movl	SAVE_EBX, %ebx
+	addl	$STACK_SPACE, %esp
+
+	ret
+
+EPILOGUE()