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diff --git a/gmp/mpn/x86/pentium/popcount.asm b/gmp/mpn/x86/pentium/popcount.asm
new file mode 100644
index 00000000..df53bb88
--- /dev/null
+++ b/gmp/mpn/x86/pentium/popcount.asm
@@ -0,0 +1,123 @@
+dnl  Intel P5 mpn_popcount -- mpn bit population count.
+
+dnl  Copyright 2001, 2002 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 P5: 8.0 cycles/limb
+
+
+C unsigned long mpn_popcount (mp_srcptr src, mp_size_t size);
+C
+C An arithmetic approach has been found to be slower than the table lookup,
+C due to needing too many instructions.
+
+C The slightly strange quoting here helps the renaming done by tune/many.pl.
+deflit(TABLE_NAME,
+m4_assert_defined(`GSYM_PREFIX')
+GSYM_PREFIX`'mpn_popcount``'_table')
+
+	RODATA
+	ALIGN(8)
+	GLOBL	TABLE_NAME
+TABLE_NAME:
+forloop(i,0,255,
+`	.byte	m4_popcount(i)
+')
+
+defframe(PARAM_SIZE,8)
+defframe(PARAM_SRC, 4)
+
+	TEXT
+	ALIGN(8)
+
+PROLOGUE(mpn_popcount)
+deflit(`FRAME',0)
+
+	movl	PARAM_SIZE, %ecx
+	pushl	%esi	FRAME_pushl()
+
+ifdef(`PIC',`
+	pushl	%ebx	FRAME_pushl()
+	pushl	%ebp	FRAME_pushl()
+
+	call	L(here)
+L(here):
+	popl	%ebp
+	shll	%ecx		C size in byte pairs
+
+	addl	$_GLOBAL_OFFSET_TABLE_+[.-L(here)], %ebp
+	movl	PARAM_SRC, %esi
+
+	xorl	%eax, %eax	C total
+	xorl	%ebx, %ebx	C byte
+
+	movl	TABLE_NAME@GOT(%ebp), %ebp
+	xorl	%edx, %edx	C byte
+define(TABLE,`(%ebp,$1)')
+',`
+dnl non-PIC
+	shll	%ecx		C size in byte pairs
+	movl	PARAM_SRC, %esi
+
+	pushl	%ebx	FRAME_pushl()
+	xorl	%eax, %eax	C total
+
+	xorl	%ebx, %ebx	C byte
+	xorl	%edx, %edx	C byte
+
+define(TABLE,`TABLE_NAME`'($1)')
+')
+
+
+	ALIGN(8)	C necessary on P55 for claimed speed
+L(top):
+	C eax	total
+	C ebx	byte
+	C ecx	counter, 2*size to 2
+	C edx	byte
+	C esi	src
+	C edi
+	C ebp	[PIC] table
+
+	addl	%ebx, %eax
+	movb	-1(%esi,%ecx,2), %bl
+
+	addl	%edx, %eax
+	movb	-2(%esi,%ecx,2), %dl
+
+	movb	TABLE(%ebx), %bl
+	decl	%ecx
+
+	movb	TABLE(%edx), %dl
+	jnz	L(top)
+
+
+ifdef(`PIC',`
+	popl	%ebp
+')
+	addl	%ebx, %eax
+	popl	%ebx
+
+	addl	%edx, %eax
+	popl	%esi
+
+	ret
+
+EPILOGUE()