diff --git a/kernel/x86_64/sum.S b/kernel/x86_64/sum.S
new file mode 100644
index 000000000..d075eaa04
--- /dev/null
+++ b/kernel/x86_64/sum.S
@@ -0,0 +1,179 @@
+/*********************************************************************/
+/* Copyright 2009, 2010 The University of Texas at Austin.           */
+/* All rights reserved.                                              */
+/*                                                                   */
+/* Redistribution and use in source and binary forms, with or        */
+/* without modification, are permitted provided that the following   */
+/* conditions are met:                                               */
+/*                                                                   */
+/*   1. Redistributions of source code must retain the above         */
+/*      copyright notice, this list of conditions and the following  */
+/*      disclaimer.                                                  */
+/*                                                                   */
+/*   2. Redistributions in binary form must reproduce the above      */
+/*      copyright notice, this list of conditions and the following  */
+/*      disclaimer in the documentation and/or other materials       */
+/*      provided with the distribution.                              */
+/*                                                                   */
+/*    THIS  SOFTWARE IS PROVIDED  BY THE  UNIVERSITY OF  TEXAS AT    */
+/*    AUSTIN  ``AS IS''  AND ANY  EXPRESS OR  IMPLIED WARRANTIES,    */
+/*    INCLUDING, BUT  NOT LIMITED  TO, THE IMPLIED  WARRANTIES OF    */
+/*    MERCHANTABILITY  AND FITNESS FOR  A PARTICULAR  PURPOSE ARE    */
+/*    DISCLAIMED.  IN  NO EVENT SHALL THE UNIVERSITY  OF TEXAS AT    */
+/*    AUSTIN OR CONTRIBUTORS BE  LIABLE FOR ANY DIRECT, INDIRECT,    */
+/*    INCIDENTAL,  SPECIAL, EXEMPLARY,  OR  CONSEQUENTIAL DAMAGES    */
+/*    (INCLUDING, BUT  NOT LIMITED TO,  PROCUREMENT OF SUBSTITUTE    */
+/*    GOODS  OR  SERVICES; LOSS  OF  USE,  DATA,  OR PROFITS;  OR    */
+/*    BUSINESS INTERRUPTION) HOWEVER CAUSED  AND ON ANY THEORY OF    */
+/*    LIABILITY, WHETHER  IN CONTRACT, STRICT  LIABILITY, OR TORT    */
+/*    (INCLUDING NEGLIGENCE OR OTHERWISE)  ARISING IN ANY WAY OUT    */
+/*    OF  THE  USE OF  THIS  SOFTWARE,  EVEN  IF ADVISED  OF  THE    */
+/*    POSSIBILITY OF SUCH DAMAGE.                                    */
+/*                                                                   */
+/* The views and conclusions contained in the software and           */
+/* documentation are those of the authors and should not be          */
+/* interpreted as representing official policies, either expressed   */
+/* or implied, of The University of Texas at Austin.                 */
+/*********************************************************************/
+
+#define ASSEMBLER
+#include "common.h"
+
+#define M	ARG1
+#define X	ARG2
+#define INCX	ARG3
+
+#define I	%rax
+
+#include "l1param.h"
+
+	PROLOGUE
+	PROFCODE
+
+	fldz
+	testq	M, M
+	jle	.L999
+	testq	INCX, INCX
+	jle	.L999
+
+	salq	$BASE_SHIFT, INCX
+
+	fldz
+	fldz
+	fldz
+	cmpq	$SIZE, INCX
+	jne	.L40
+
+	movq	M, I
+	sarq	$3,   I
+	jle	.L20
+	ALIGN_4
+
+.L10:
+#ifdef PREFETCH
+	PREFETCH (PREFETCHSIZE +  0) - PREOFFSET(X)
+#endif
+
+	FLD	0 * SIZE(X)
+	FLD	1 * SIZE(X)
+	FLD	2 * SIZE(X)
+	FLD	3 * SIZE(X)
+
+	faddp	%st, %st(7)
+	faddp	%st, %st(5)
+	faddp	%st, %st(3)
+	faddp	%st, %st(1)
+
+	FLD	4 * SIZE(X)
+	FLD	5 * SIZE(X)
+	FLD	6 * SIZE(X)
+	FLD	7 * SIZE(X)
+
+	addq	$8 * SIZE, X
+
+	faddp	%st, %st(7)
+	faddp	%st, %st(5)
+	faddp	%st, %st(3)
+	faddp	%st, %st(1)
+
+	decq	I
+	jg	.L10
+	ALIGN_4
+
+.L20:
+	andq	$7,  M
+	jle	.L998
+	ALIGN_4
+
+.L21:
+	FLD	(X)
+	faddp	%st,%st(1)
+	addq	$1 * SIZE, X
+	decq	M
+	jg	.L21
+	jmp	.L998
+	ALIGN_4
+
+.L40:
+	movq	M, I
+	sarq	$3,   I
+	jle	.L60
+	ALIGN_4
+
+.L50:
+	FLD	(X)
+	addq	INCX, X
+	FLD	(X)
+	addq	INCX, X
+	FLD	(X)
+	addq	INCX, X
+	FLD	(X)
+	addq	INCX, X
+
+	faddp	%st, %st(7)
+	faddp	%st, %st(5)
+	faddp	%st, %st(3)
+	faddp	%st, %st(1)
+
+	FLD	(X)
+	addq	INCX, X
+	FLD	(X)
+	addq	INCX, X
+	FLD	(X)
+	addq	INCX, X
+	FLD	(X)
+	addq	INCX, X
+
+	faddp	%st, %st(7)
+	faddp	%st, %st(5)
+	faddp	%st, %st(3)
+	faddp	%st, %st(1)
+
+	decq	I
+	jg	.L50
+	ALIGN_4
+
+.L60:
+	andq	$7,  M
+	jle	.L998
+	ALIGN_4
+
+
+.L61:
+	FLD	(X)
+	addq	INCX, X
+	faddp	%st,%st(1)
+	decq	M
+	jg	.L61
+	ALIGN_4
+
+.L998:
+	faddp	%st,%st(2)
+	faddp	%st,%st(1)
+	faddp	%st,%st(1)
+	ALIGN_4
+
+.L999:
+	ret
+
+	EPILOGUE
diff --git a/kernel/x86_64/zsum.S b/kernel/x86_64/zsum.S
new file mode 100644
index 000000000..45e0ddff5
--- /dev/null
+++ b/kernel/x86_64/zsum.S
@@ -0,0 +1,180 @@
+/*********************************************************************/
+/* Copyright 2009, 2010 The University of Texas at Austin.           */
+/* All rights reserved.                                              */
+/*                                                                   */
+/* Redistribution and use in source and binary forms, with or        */
+/* without modification, are permitted provided that the following   */
+/* conditions are met:                                               */
+/*                                                                   */
+/*   1. Redistributions of source code must retain the above         */
+/*      copyright notice, this list of conditions and the following  */
+/*      disclaimer.                                                  */
+/*                                                                   */
+/*   2. Redistributions in binary form must reproduce the above      */
+/*      copyright notice, this list of conditions and the following  */
+/*      disclaimer in the documentation and/or other materials       */
+/*      provided with the distribution.                              */
+/*                                                                   */
+/*    THIS  SOFTWARE IS PROVIDED  BY THE  UNIVERSITY OF  TEXAS AT    */
+/*    AUSTIN  ``AS IS''  AND ANY  EXPRESS OR  IMPLIED WARRANTIES,    */
+/*    INCLUDING, BUT  NOT LIMITED  TO, THE IMPLIED  WARRANTIES OF    */
+/*    MERCHANTABILITY  AND FITNESS FOR  A PARTICULAR  PURPOSE ARE    */
+/*    DISCLAIMED.  IN  NO EVENT SHALL THE UNIVERSITY  OF TEXAS AT    */
+/*    AUSTIN OR CONTRIBUTORS BE  LIABLE FOR ANY DIRECT, INDIRECT,    */
+/*    INCIDENTAL,  SPECIAL, EXEMPLARY,  OR  CONSEQUENTIAL DAMAGES    */
+/*    (INCLUDING, BUT  NOT LIMITED TO,  PROCUREMENT OF SUBSTITUTE    */
+/*    GOODS  OR  SERVICES; LOSS  OF  USE,  DATA,  OR PROFITS;  OR    */
+/*    BUSINESS INTERRUPTION) HOWEVER CAUSED  AND ON ANY THEORY OF    */
+/*    LIABILITY, WHETHER  IN CONTRACT, STRICT  LIABILITY, OR TORT    */
+/*    (INCLUDING NEGLIGENCE OR OTHERWISE)  ARISING IN ANY WAY OUT    */
+/*    OF  THE  USE OF  THIS  SOFTWARE,  EVEN  IF ADVISED  OF  THE    */
+/*    POSSIBILITY OF SUCH DAMAGE.                                    */
+/*                                                                   */
+/* The views and conclusions contained in the software and           */
+/* documentation are those of the authors and should not be          */
+/* interpreted as representing official policies, either expressed   */
+/* or implied, of The University of Texas at Austin.                 */
+/*********************************************************************/
+
+#define ASSEMBLER
+#include "common.h"
+
+#define M	ARG1
+#define X	ARG2
+#define INCX	ARG3
+
+#define I	%rax
+
+#include "l1param.h"
+
+	PROLOGUE
+	PROFCODE
+
+	fldz
+	testq	M, M
+	jle	.L999
+	testq	INCX, INCX
+	jle	.L999
+
+	salq	$ZBASE_SHIFT, INCX
+
+	fldz
+	fldz
+	fldz
+	cmpq	$SIZE * 2, INCX
+	jne	.L40
+
+	movq	M, I
+	sarq	$2,   I
+	jle	.L20
+	ALIGN_4
+
+.L10:
+#ifdef PREFETCH
+	PREFETCH (PREFETCHSIZE +  0) - PREOFFSET(X)
+#endif
+
+	FLD	0 * SIZE(X)
+	FLD	1 * SIZE(X)
+	FLD	2 * SIZE(X)
+	FLD	3 * SIZE(X)
+
+	faddp	%st, %st(7)
+	faddp	%st, %st(5)
+	faddp	%st, %st(3)
+	faddp	%st, %st(1)
+
+	FLD	4 * SIZE(X)
+	FLD	5 * SIZE(X)
+	FLD	6 * SIZE(X)
+	FLD	7 * SIZE(X)
+
+	addq	$8 * SIZE, X
+
+	faddp	%st, %st(7)
+	faddp	%st, %st(5)
+	faddp	%st, %st(3)
+	faddp	%st, %st(1)
+
+	decq	I
+	jg	.L10
+	ALIGN_4
+
+.L20:
+	andq	$3,  M
+	jle	.L998
+	ALIGN_4
+
+
+.L21:
+	FLD	0 * SIZE(X)
+	FLD	1 * SIZE(X)
+	faddp	%st,%st(3)
+	faddp	%st,%st(1)
+	addq	$2 * SIZE, X
+	decq	M
+	jg	.L21
+	jmp	.L998
+	ALIGN_4
+
+.L40:
+	movq	M, I
+	sarq	$2,   I
+	jle	.L60
+	ALIGN_4
+
+.L50:
+	FLD	0 * SIZE(X)
+	FLD	1 * SIZE(X)
+	addq	INCX, X
+	FLD	0 * SIZE(X)
+	FLD	1 * SIZE(X)
+	addq	INCX, X
+
+	faddp	%st, %st(7)
+	faddp	%st, %st(5)
+	faddp	%st, %st(3)
+	faddp	%st, %st(1)
+
+	FLD	0 * SIZE(X)
+	FLD	1 * SIZE(X)
+	addq	INCX, X
+	FLD	0 * SIZE(X)
+	FLD	1 * SIZE(X)
+	addq	INCX, X
+
+	faddp	%st, %st(7)
+	faddp	%st, %st(5)
+	faddp	%st, %st(3)
+	faddp	%st, %st(1)
+
+	decq	I
+	jg	.L50
+	ALIGN_4
+
+.L60:
+	andq	$3,  M
+	jle	.L998
+	ALIGN_4
+
+
+.L61:
+	FLD	0 * SIZE(X)
+	FLD	1 * SIZE(X)
+	addq	INCX, X
+	faddp	%st,%st(3)
+	faddp	%st,%st(1)
+	decq	M
+	jg	.L61
+	ALIGN_4
+
+.L998:
+	faddp	%st,%st(2)
+	faddp	%st,%st(1)
+	faddp	%st,%st(1)
+	ALIGN_4
+
+.L999:
+	ret
+
+	EPILOGUE