Added memcpy/memmove family optimized with AVX512 for KNL hardware.

Added AVX512 implementations of memcpy, mempcpy, memmove, memcpy_chk,
mempcpy_chk, memmove_chk.
It shows average improvement more than 30% over AVX versions on KNL
hardware (performance results attached in the thread
<https://sourceware.org/ml/libc-alpha/2016-01/msg00258.html>).

    * sysdeps/x86_64/multiarch/Makefile (sysdep_routines): Added new files.
    * sysdeps/x86_64/multiarch/ifunc-impl-list.c: Added new tests.
    * sysdeps/x86_64/multiarch/memcpy-avx512-no-vzeroupper.S: New file.
    * sysdeps/x86_64/multiarch/mempcpy-avx512-no-vzeroupper.S: Likewise.
    * sysdeps/x86_64/multiarch/memmove-avx512-no-vzeroupper.S: Likewise.
    * sysdeps/x86_64/multiarch/memcpy.S: Added new IFUNC branch.
    * sysdeps/x86_64/multiarch/memcpy_chk.S: Likewise.
    * sysdeps/x86_64/multiarch/memmove.c: Likewise.
    * sysdeps/x86_64/multiarch/memmove_chk.c: Likewise.
    * sysdeps/x86_64/multiarch/mempcpy.S: Likewise.
    * sysdeps/x86_64/multiarch/mempcpy_chk.S: Likewise.

11 files changed, 542 insertions, 19 deletions

diff --git a/sysdeps/x86_64/multiarch/Makefile b/sysdeps/x86_64/multiarch/Makefile
index b2e31efe02..d234f4ab66 100644
--- a/sysdeps/x86_64/multiarch/Makefile
+++ b/sysdeps/x86_64/multiarch/Makefile
@@ -7,11 +7,12 @@ ifeq ($(subdir),string)
 
 sysdep_routines += strncat-c stpncpy-c strncpy-c strcmp-ssse3 \
 		   strcmp-sse2-unaligned strncmp-ssse3 \
-		   memcmp-sse4 memcpy-ssse3 \
-		   memcpy-sse2-unaligned mempcpy-ssse3 \
-		   memmove-ssse3 memcpy-ssse3-back mempcpy-ssse3-back \
-		   memmove-avx-unaligned memcpy-avx-unaligned mempcpy-avx-unaligned \
-		   memmove-ssse3-back strcasecmp_l-ssse3 \
+		   memcmp-sse4 memcpy-ssse3 memcpy-sse2-unaligned \
+		   memcpy-avx512-no-vzeroupper mempcpy-ssse3 memmove-ssse3 \
+		   memcpy-ssse3-back mempcpy-ssse3-back memmove-avx-unaligned \
+		   memcpy-avx-unaligned mempcpy-avx-unaligned \
+		   mempcpy-avx512-no-vzeroupper memmove-ssse3-back \
+		   memmove-avx512-no-vzeroupper strcasecmp_l-ssse3 \
 		   strncase_l-ssse3 strcat-ssse3 strncat-ssse3\
 		   strcpy-ssse3 strncpy-ssse3 stpcpy-ssse3 stpncpy-ssse3 \
 		   strcpy-sse2-unaligned strncpy-sse2-unaligned \
diff --git a/sysdeps/x86_64/multiarch/ifunc-impl-list.c b/sysdeps/x86_64/multiarch/ifunc-impl-list.c
index 5f600dc1c2..d9ff016659 100644
--- a/sysdeps/x86_64/multiarch/ifunc-impl-list.c
+++ b/sysdeps/x86_64/multiarch/ifunc-impl-list.c
@@ -24,7 +24,7 @@
 #include "init-arch.h"
 
 /* Maximum number of IFUNC implementations.  */
-#define MAX_IFUNC	4
+#define MAX_IFUNC	5
 
 /* Fill ARRAY of MAX elements with IFUNC implementations for function
    NAME supported on target machine and return the number of valid
@@ -46,9 +46,12 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 			      __memcmp_ssse3)
 	      IFUNC_IMPL_ADD (array, i, memcmp, 1, __memcmp_sse2))
 
-  /* Support sysdeps/x86_64/multiarch/memmove_chk.S.  */
+  /* Support sysdeps/x86_64/multiarch/memmove_chk.c.  */
   IFUNC_IMPL (i, name, __memmove_chk,
 	      IFUNC_IMPL_ADD (array, i, __memmove_chk,
+			      HAS_ARCH_FEATURE (AVX512F_Usable),
+			      __memmove_chk_avx512_no_vzeroupper)
+	      IFUNC_IMPL_ADD (array, i, __memmove_chk,
 			      HAS_ARCH_FEATURE (AVX_Usable),
 			      __memmove_chk_avx_unaligned)
 	      IFUNC_IMPL_ADD (array, i, __memmove_chk,
@@ -65,6 +68,9 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 	      IFUNC_IMPL_ADD (array, i, memmove,
 			      HAS_ARCH_FEATURE (AVX_Usable),
 			      __memmove_avx_unaligned)
+	      IFUNC_IMPL_ADD (array, i, memmove,
+			      HAS_ARCH_FEATURE (AVX512F_Usable),
+			      __memmove_avx512_no_vzeroupper)
 	      IFUNC_IMPL_ADD (array, i, memmove, HAS_CPU_FEATURE (SSSE3),
 			      __memmove_ssse3_back)
 	      IFUNC_IMPL_ADD (array, i, memmove, HAS_CPU_FEATURE (SSSE3),
@@ -254,6 +260,9 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
   /* Support sysdeps/x86_64/multiarch/memcpy_chk.S.  */
   IFUNC_IMPL (i, name, __memcpy_chk,
 	      IFUNC_IMPL_ADD (array, i, __memcpy_chk,
+			      HAS_ARCH_FEATURE (AVX512F_Usable),
+			      __memcpy_chk_avx512_no_vzeroupper)
+	      IFUNC_IMPL_ADD (array, i, __memcpy_chk,
 			      HAS_ARCH_FEATURE (AVX_Usable),
 			      __memcpy_chk_avx_unaligned)
 	      IFUNC_IMPL_ADD (array, i, __memcpy_chk,
@@ -274,12 +283,18 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 			      __memcpy_ssse3_back)
 	      IFUNC_IMPL_ADD (array, i, memcpy, HAS_CPU_FEATURE (SSSE3),
 			      __memcpy_ssse3)
+	      IFUNC_IMPL_ADD (array, i, memcpy,
+			      HAS_ARCH_FEATURE (AVX512F_Usable),
+			      __memcpy_avx512_no_vzeroupper)
 	      IFUNC_IMPL_ADD (array, i, memcpy, 1, __memcpy_sse2_unaligned)
 	      IFUNC_IMPL_ADD (array, i, memcpy, 1, __memcpy_sse2))
 
   /* Support sysdeps/x86_64/multiarch/mempcpy_chk.S.  */
   IFUNC_IMPL (i, name, __mempcpy_chk,
 	      IFUNC_IMPL_ADD (array, i, __mempcpy_chk,
+			      HAS_ARCH_FEATURE (AVX512F_Usable),
+			      __mempcpy_chk_avx512_no_vzeroupper)
+	      IFUNC_IMPL_ADD (array, i, __mempcpy_chk,
 			      HAS_ARCH_FEATURE (AVX_Usable),
 			      __mempcpy_chk_avx_unaligned)
 	      IFUNC_IMPL_ADD (array, i, __mempcpy_chk,
@@ -294,6 +309,9 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
   /* Support sysdeps/x86_64/multiarch/mempcpy.S.  */
   IFUNC_IMPL (i, name, mempcpy,
 	      IFUNC_IMPL_ADD (array, i, mempcpy,
+			      HAS_ARCH_FEATURE (AVX512F_Usable),
+			      __mempcpy_avx512_no_vzeroupper)
+	      IFUNC_IMPL_ADD (array, i, mempcpy,
 			      HAS_ARCH_FEATURE (AVX_Usable),
 			      __mempcpy_avx_unaligned)
 	      IFUNC_IMPL_ADD (array, i, mempcpy, HAS_CPU_FEATURE (SSSE3),
diff --git a/sysdeps/x86_64/multiarch/memcpy-avx512-no-vzeroupper.S b/sysdeps/x86_64/multiarch/memcpy-avx512-no-vzeroupper.S
new file mode 100644
index 0000000000..cc02934a82
--- /dev/null
+++ b/sysdeps/x86_64/multiarch/memcpy-avx512-no-vzeroupper.S
@@ -0,0 +1,410 @@
+/* memcpy optimized with AVX512 for KNL hardware.

+   Copyright (C) 2016 Free Software Foundation, Inc.

+   This file is part of the GNU C Library.

+

+   The GNU C 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 C 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 C Library; if not, see

+   <http://www.gnu.org/licenses/>.  */

+

+#include <sysdep.h>

+

+#if defined HAVE_AVX512_ASM_SUPPORT && IS_IN (libc) \

+    && (defined SHARED \

+	|| defined USE_AS_MEMMOVE \

+	|| !defined USE_MULTIARCH)

+

+#include "asm-syntax.h"

+#ifndef MEMCPY

+# define MEMCPY		__memcpy_avx512_no_vzeroupper

+# define MEMCPY_CHK	__memcpy_chk_avx512_no_vzeroupper

+#endif

+

+	.section .text,"ax",@progbits

+#if !defined USE_AS_BCOPY

+ENTRY (MEMCPY_CHK)

+	cmpq	%rdx, %rcx

+	jb	HIDDEN_JUMPTARGET (__chk_fail)

+END (MEMCPY_CHK)

+#endif

+

+ENTRY (MEMCPY)

+	mov	%rdi, %rax

+#ifdef USE_AS_MEMPCPY

+	add	%rdx, %rax

+#endif

+	lea	(%rsi, %rdx), %rcx

+	lea	(%rdi, %rdx), %r9

+	cmp	$512, %rdx

+	ja	L(512bytesormore)

+

+L(check):

+	cmp	$16, %rdx

+	jbe	L(less_16bytes)

+	cmp	$256, %rdx

+	jb	L(less_256bytes)

+	vmovups	(%rsi), %zmm0

+	vmovups 0x40(%rsi), %zmm1

+	vmovups 0x80(%rsi), %zmm2

+	vmovups 0xC0(%rsi), %zmm3

+	vmovups	-0x100(%rcx), %zmm4

+	vmovups -0xC0(%rcx), %zmm5

+	vmovups -0x80(%rcx), %zmm6

+	vmovups -0x40(%rcx), %zmm7

+	vmovups %zmm0, (%rdi)

+	vmovups %zmm1, 0x40(%rdi)

+	vmovups %zmm2, 0x80(%rdi)

+	vmovups %zmm3, 0xC0(%rdi)

+	vmovups	%zmm4, -0x100(%r9)

+	vmovups %zmm5, -0xC0(%r9)

+	vmovups %zmm6, -0x80(%r9)

+	vmovups %zmm7, -0x40(%r9)

+	ret

+

+L(less_256bytes):

+	cmp	$128, %dl

+	jb	L(less_128bytes)

+	vmovups	(%rsi), %zmm0

+	vmovups 0x40(%rsi), %zmm1

+	vmovups -0x80(%rcx), %zmm2

+	vmovups -0x40(%rcx), %zmm3

+	vmovups	%zmm0, (%rdi)

+	vmovups %zmm1, 0x40(%rdi)

+	vmovups %zmm2, -0x80(%r9)

+	vmovups %zmm3, -0x40(%r9)

+	ret

+

+L(less_128bytes):

+	cmp	$64, %dl

+	jb	L(less_64bytes)

+	vmovdqu (%rsi), %ymm0

+	vmovdqu 0x20(%rsi), %ymm1

+	vmovdqu -0x40(%rcx), %ymm2

+	vmovdqu -0x20(%rcx), %ymm3

+	vmovdqu %ymm0, (%rdi)

+	vmovdqu %ymm1, 0x20(%rdi)

+	vmovdqu %ymm2, -0x40(%r9)

+	vmovdqu %ymm3, -0x20(%r9)

+	ret

+

+L(less_64bytes):

+	cmp	$32, %dl

+	jb	L(less_32bytes)

+	vmovdqu	(%rsi), %ymm0

+	vmovdqu -0x20(%rcx), %ymm1

+	vmovdqu	%ymm0, (%rdi)

+	vmovdqu	%ymm1, -0x20(%r9)

+	ret

+

+L(less_32bytes):

+	vmovdqu (%rsi), %xmm0

+	vmovdqu -0x10(%rcx), %xmm1

+	vmovdqu %xmm0, (%rdi)

+	vmovdqu %xmm1, -0x10(%r9)

+	ret

+

+L(less_16bytes):

+	cmp	$8, %dl

+	jb	L(less_8bytes)

+	movq	(%rsi), %rsi

+	movq	-0x8(%rcx), %rcx

+	movq	%rsi, (%rdi)

+	movq	%rcx, -0x8(%r9)

+	ret

+

+L(less_8bytes):

+	cmp	$4, %dl

+	jb	L(less_4bytes)

+	mov	(%rsi), %esi

+	mov	-0x4(%rcx), %ecx

+	mov	%esi, (%rdi)

+	mov	%ecx, -0x4(%r9)

+	ret

+

+L(less_4bytes):

+	cmp	$2, %dl

+	jb	L(less_2bytes)

+	mov	(%rsi), %si

+	mov	-0x2(%rcx), %cx

+	mov	%si, (%rdi)

+	mov	%cx, -0x2(%r9)

+	ret

+

+L(less_2bytes):

+	cmp	$1, %dl

+	jb	L(less_1bytes)	

+	mov	(%rsi), %cl

+	mov	%cl, (%rdi)

+L(less_1bytes):

+	ret

+

+L(512bytesormore):

+#ifdef SHARED_CACHE_SIZE_HALF

+	mov	$SHARED_CACHE_SIZE_HALF, %r8

+#else

+	mov	__x86_shared_cache_size_half(%rip), %r8

+#endif

+	cmp	%r8, %rdx

+	jae	L(preloop_large)

+	cmp	$1024, %rdx

+	ja	L(1024bytesormore)

+	prefetcht1 (%rsi)

+	prefetcht1 0x40(%rsi)

+	prefetcht1 0x80(%rsi)

+	prefetcht1 0xC0(%rsi)

+	prefetcht1 0x100(%rsi)

+	prefetcht1 0x140(%rsi)

+	prefetcht1 0x180(%rsi)

+	prefetcht1 0x1C0(%rsi)

+	prefetcht1 -0x200(%rcx)

+	prefetcht1 -0x1C0(%rcx)

+	prefetcht1 -0x180(%rcx)

+	prefetcht1 -0x140(%rcx)

+	prefetcht1 -0x100(%rcx)

+	prefetcht1 -0xC0(%rcx)

+	prefetcht1 -0x80(%rcx)

+	prefetcht1 -0x40(%rcx)	

+	vmovups	(%rsi), %zmm0

+	vmovups 0x40(%rsi), %zmm1

+	vmovups 0x80(%rsi), %zmm2

+	vmovups 0xC0(%rsi), %zmm3

+	vmovups	0x100(%rsi), %zmm4

+	vmovups 0x140(%rsi), %zmm5

+	vmovups 0x180(%rsi), %zmm6

+	vmovups 0x1C0(%rsi), %zmm7

+	vmovups	-0x200(%rcx), %zmm8

+	vmovups -0x1C0(%rcx), %zmm9

+	vmovups -0x180(%rcx), %zmm10

+	vmovups -0x140(%rcx), %zmm11

+	vmovups	-0x100(%rcx), %zmm12

+	vmovups -0xC0(%rcx), %zmm13

+	vmovups -0x80(%rcx), %zmm14

+	vmovups -0x40(%rcx), %zmm15

+	vmovups %zmm0, (%rdi)

+	vmovups %zmm1, 0x40(%rdi)

+	vmovups %zmm2, 0x80(%rdi)

+	vmovups %zmm3, 0xC0(%rdi)

+	vmovups %zmm4, 0x100(%rdi)

+	vmovups %zmm5, 0x140(%rdi)

+	vmovups %zmm6, 0x180(%rdi)

+	vmovups %zmm7, 0x1C0(%rdi)

+	vmovups	%zmm8, -0x200(%r9)

+	vmovups %zmm9, -0x1C0(%r9)

+	vmovups %zmm10, -0x180(%r9)

+	vmovups %zmm11, -0x140(%r9)

+	vmovups	%zmm12, -0x100(%r9)

+	vmovups %zmm13, -0xC0(%r9)

+	vmovups %zmm14, -0x80(%r9)

+	vmovups %zmm15, -0x40(%r9)

+	ret

+

+L(1024bytesormore):

+	cmp	%rsi, %rdi

+	ja	L(1024bytesormore_bkw)

+	sub	$512, %r9

+	vmovups -0x200(%rcx), %zmm8

+	vmovups -0x1C0(%rcx), %zmm9

+	vmovups -0x180(%rcx), %zmm10

+	vmovups -0x140(%rcx), %zmm11

+	vmovups	-0x100(%rcx), %zmm12

+	vmovups -0xC0(%rcx), %zmm13

+	vmovups -0x80(%rcx), %zmm14

+	vmovups -0x40(%rcx), %zmm15

+	prefetcht1 (%rsi)

+	prefetcht1 0x40(%rsi)

+	prefetcht1 0x80(%rsi)

+	prefetcht1 0xC0(%rsi)

+	prefetcht1 0x100(%rsi)

+	prefetcht1 0x140(%rsi)

+	prefetcht1 0x180(%rsi)

+	prefetcht1 0x1C0(%rsi)

+

+/* Loop with unaligned memory access.  */

+L(gobble_512bytes_loop):

+	vmovups	(%rsi), %zmm0

+	vmovups 0x40(%rsi), %zmm1

+	vmovups 0x80(%rsi), %zmm2

+	vmovups 0xC0(%rsi), %zmm3

+	vmovups	0x100(%rsi), %zmm4

+	vmovups 0x140(%rsi), %zmm5

+	vmovups 0x180(%rsi), %zmm6

+	vmovups 0x1C0(%rsi), %zmm7

+	add	$512, %rsi

+	prefetcht1 (%rsi)

+	prefetcht1 0x40(%rsi)

+	prefetcht1 0x80(%rsi)

+	prefetcht1 0xC0(%rsi)

+	prefetcht1 0x100(%rsi)

+	prefetcht1 0x140(%rsi)

+	prefetcht1 0x180(%rsi)

+	prefetcht1 0x1C0(%rsi)

+	vmovups	%zmm0, (%rdi)

+	vmovups %zmm1, 0x40(%rdi)

+	vmovups %zmm2, 0x80(%rdi)

+	vmovups %zmm3, 0xC0(%rdi)

+	vmovups	%zmm4, 0x100(%rdi)

+	vmovups %zmm5, 0x140(%rdi)

+	vmovups %zmm6, 0x180(%rdi)

+	vmovups %zmm7, 0x1C0(%rdi)

+	add	$512, %rdi

+	cmp	%r9, %rdi

+	jb	L(gobble_512bytes_loop)

+	vmovups %zmm8, (%r9)

+	vmovups %zmm9, 0x40(%r9)

+	vmovups %zmm10, 0x80(%r9)

+	vmovups %zmm11, 0xC0(%r9)

+	vmovups %zmm12, 0x100(%r9)

+	vmovups %zmm13, 0x140(%r9)

+	vmovups %zmm14, 0x180(%r9)

+	vmovups %zmm15, 0x1C0(%r9)

+	ret

+

+L(1024bytesormore_bkw):

+	add	$512, %rdi

+	vmovups	0x1C0(%rsi), %zmm8

+	vmovups 0x180(%rsi), %zmm9

+	vmovups 0x140(%rsi), %zmm10

+	vmovups 0x100(%rsi), %zmm11

+	vmovups	0xC0(%rsi), %zmm12

+	vmovups 0x80(%rsi), %zmm13

+	vmovups 0x40(%rsi), %zmm14

+	vmovups (%rsi), %zmm15

+	prefetcht1 -0x40(%rcx)

+	prefetcht1 -0x80(%rcx)

+	prefetcht1 -0xC0(%rcx)

+	prefetcht1 -0x100(%rcx)

+	prefetcht1 -0x140(%rcx)

+	prefetcht1 -0x180(%rcx)

+	prefetcht1 -0x1C0(%rcx)

+	prefetcht1 -0x200(%rcx)

+	

+/* Backward loop with unaligned memory access.  */

+L(gobble_512bytes_loop_bkw):

+	vmovups -0x40(%rcx), %zmm0

+	vmovups -0x80(%rcx), %zmm1

+	vmovups -0xC0(%rcx), %zmm2

+	vmovups	-0x100(%rcx), %zmm3

+	vmovups -0x140(%rcx), %zmm4

+	vmovups -0x180(%rcx), %zmm5

+	vmovups -0x1C0(%rcx), %zmm6

+	vmovups	-0x200(%rcx), %zmm7

+	sub	$512, %rcx

+	prefetcht1 -0x40(%rcx)

+	prefetcht1 -0x80(%rcx)

+	prefetcht1 -0xC0(%rcx)

+	prefetcht1 -0x100(%rcx)

+	prefetcht1 -0x140(%rcx)

+	prefetcht1 -0x180(%rcx)

+	prefetcht1 -0x1C0(%rcx)

+	prefetcht1 -0x200(%rcx)

+	vmovups %zmm0, -0x40(%r9)	

+	vmovups %zmm1, -0x80(%r9)	

+	vmovups %zmm2, -0xC0(%r9)	

+	vmovups	%zmm3, -0x100(%r9)	

+	vmovups %zmm4, -0x140(%r9)	

+	vmovups %zmm5, -0x180(%r9)	

+	vmovups %zmm6, -0x1C0(%r9)

+	vmovups	%zmm7, -0x200(%r9)	

+	sub	$512, %r9

+	cmp	%rdi, %r9

+	ja	L(gobble_512bytes_loop_bkw)

+	vmovups %zmm8, -0x40(%rdi)

+	vmovups %zmm9, -0x80(%rdi)

+	vmovups %zmm10, -0xC0(%rdi)

+	vmovups %zmm11, -0x100(%rdi)

+	vmovups %zmm12, -0x140(%rdi)

+	vmovups %zmm13, -0x180(%rdi)

+	vmovups %zmm14, -0x1C0(%rdi)

+	vmovups %zmm15, -0x200(%rdi)

+	ret

+

+L(preloop_large):

+	cmp	%rsi, %rdi

+	ja	L(preloop_large_bkw)

+	vmovups	(%rsi), %zmm4

+	vmovups	0x40(%rsi), %zmm5

+

+/* Align destination for access with non-temporal stores in the loop.  */

+	mov	%rdi, %r8

+	and	$-0x80, %rdi

+	add	$0x80, %rdi

+	sub	%rdi, %r8	

+	sub	%r8, %rsi

+	add	%r8, %rdx

+	prefetcht1 (%rsi)

+	prefetcht1 0x40(%rsi)

+	prefetcht1 0x80(%rsi)

+	prefetcht1 0xC0(%rsi)

+L(gobble_256bytes_nt_loop):

+	vmovups	(%rsi), %zmm0

+	prefetcht1 0x100(%rsi)

+	vmovups	0x40(%rsi), %zmm1

+	prefetcht1 0x140(%rsi)

+	vmovups	0x80(%rsi), %zmm2

+	prefetcht1 0x180(%rsi)

+	vmovups	0xC0(%rsi), %zmm3

+	prefetcht1 0x1C0(%rsi)

+	vmovntdq %zmm0, (%rdi)

+	vmovntdq %zmm1, 0x40(%rdi)

+	vmovntdq %zmm2, 0x80(%rdi)

+	vmovntdq %zmm3, 0xC0(%rdi)

+	sub	$256, %rdx

+	add	$256, %rsi

+	add	$256, %rdi

+	cmp	$256, %rdx

+	ja	L(gobble_256bytes_nt_loop)

+	sfence

+	vmovups	%zmm4, (%rax)

+	vmovups	%zmm5, 0x40(%rax)

+	jmp	L(check)

+

+L(preloop_large_bkw):

+	vmovups -0x80(%rcx), %zmm4

+	vmovups -0x40(%rcx), %zmm5

+

+/* Align end of destination for access with non-temporal stores.  */

+	mov	%r9, %r8

+	and	$-0x80, %r9

+	sub	%r9, %r8

+	sub	%r8, %rcx

+	sub	%r8, %rdx

+	add	%r9, %r8

+ 	prefetcht1 -0x100(%rcx)

+	prefetcht1 -0xC0(%rcx)

+	prefetcht1 -0x80(%rcx)

+	prefetcht1 -0x40(%rcx)

+L(gobble_256bytes_nt_loop_bkw):

+	vmovups	-0x100(%rcx), %zmm0

+	prefetcht1 -0x200(%rcx)

+	vmovups	-0xC0(%rcx), %zmm1

+	prefetcht1 -0x1C0(%rcx)

+	vmovups	-0x80(%rcx), %zmm2

+	prefetcht1 -0x180(%rcx)

+	vmovups	-0x40(%rcx), %zmm3

+	prefetcht1 -0x140(%rcx)

+	vmovntdq %zmm0,	-0x100(%r9)

+	vmovntdq %zmm1,	-0xC0(%r9)

+	vmovntdq %zmm2,	-0x80(%r9)

+	vmovntdq %zmm3,	-0x40(%r9)

+	sub	$256, %rdx

+	sub	$256, %rcx

+	sub	$256, %r9

+	cmp	$256, %rdx

+	ja	L(gobble_256bytes_nt_loop_bkw)

+	sfence

+	vmovups	%zmm4, -0x80(%r8)

+	vmovups	%zmm5, -0x40(%r8)

+	jmp	L(check)

+

+END (MEMCPY)

+

+#endif

diff --git a/sysdeps/x86_64/multiarch/memcpy.S b/sysdeps/x86_64/multiarch/memcpy.S
index 27fca2957e..64a1bcd137 100644
--- a/sysdeps/x86_64/multiarch/memcpy.S
+++ b/sysdeps/x86_64/multiarch/memcpy.S
@@ -30,19 +30,27 @@
 ENTRY(__new_memcpy)
 	.type	__new_memcpy, @gnu_indirect_function
 	LOAD_RTLD_GLOBAL_RO_RDX
-	leaq	__memcpy_avx_unaligned(%rip), %rax
+#ifdef HAVE_AVX512_ASM_SUPPORT
+	HAS_ARCH_FEATURE (AVX512F_Usable)
+	jz	1f
+	HAS_ARCH_FEATURE (Prefer_No_VZEROUPPER)
+	jz	1f
+	leaq    __memcpy_avx512_no_vzeroupper(%rip), %rax
+	ret
+#endif
+1:	leaq	__memcpy_avx_unaligned(%rip), %rax
 	HAS_ARCH_FEATURE (AVX_Fast_Unaligned_Load)
-	jz 1f
+	jz 2f
 	ret
-1:	leaq	__memcpy_sse2(%rip), %rax
+2:	leaq	__memcpy_sse2(%rip), %rax
 	HAS_ARCH_FEATURE (Slow_BSF)
-	jnz	2f
+	jnz	3f
 	leaq	__memcpy_sse2_unaligned(%rip), %rax
 	ret
-2:	HAS_CPU_FEATURE (SSSE3)
-	jz 3f
+3:	HAS_CPU_FEATURE (SSSE3)
+	jz 4f
 	leaq    __memcpy_ssse3(%rip), %rax
-3:	ret
+4:	ret
 END(__new_memcpy)
 
 # undef ENTRY
diff --git a/sysdeps/x86_64/multiarch/memcpy_chk.S b/sysdeps/x86_64/multiarch/memcpy_chk.S
index 6476c624f9..a0d56d40cd 100644
--- a/sysdeps/x86_64/multiarch/memcpy_chk.S
+++ b/sysdeps/x86_64/multiarch/memcpy_chk.S
@@ -30,7 +30,15 @@
 ENTRY(__memcpy_chk)
 	.type	__memcpy_chk, @gnu_indirect_function
 	LOAD_RTLD_GLOBAL_RO_RDX
-	leaq	__memcpy_chk_sse2(%rip), %rax
+#ifdef HAVE_AVX512_ASM_SUPPORT
+	HAS_ARCH_FEATURE (AVX512F_Usable)
+	jz      1f
+#	HAS_ARCH_FEATURE (Prefer_No_VZEROUPPER)
+#	jz      1f
+	leaq    __memcpy_avx512_no_vzeroupper(%rip), %rax
+	ret
+#endif
+1:	leaq	__memcpy_chk_sse2(%rip), %rax
 	HAS_CPU_FEATURE (SSSE3)
 	jz	2f
 	leaq	__memcpy_chk_ssse3(%rip), %rax
diff --git a/sysdeps/x86_64/multiarch/memmove-avx512-no-vzeroupper.S b/sysdeps/x86_64/multiarch/memmove-avx512-no-vzeroupper.S
new file mode 100644
index 0000000000..518d1fec35
--- /dev/null
+++ b/sysdeps/x86_64/multiarch/memmove-avx512-no-vzeroupper.S
@@ -0,0 +1,22 @@
+/* memmove optimized with AVX512 for KNL hardware.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C 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 C 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 C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#define USE_AS_MEMMOVE
+#define MEMCPY		__memmove_avx512_no_vzeroupper
+#define MEMCPY_CHK	__memmove_chk_avx512_no_vzeroupper
+#include "memcpy-avx512-no-vzeroupper.S"
diff --git a/sysdeps/x86_64/multiarch/memmove.c b/sysdeps/x86_64/multiarch/memmove.c
index e8445317a2..8da5640bb0 100644
--- a/sysdeps/x86_64/multiarch/memmove.c
+++ b/sysdeps/x86_64/multiarch/memmove.c
@@ -36,6 +36,9 @@ extern __typeof (__redirect_memmove) __memmove_sse2 attribute_hidden;
 extern __typeof (__redirect_memmove) __memmove_ssse3 attribute_hidden;
 extern __typeof (__redirect_memmove) __memmove_ssse3_back attribute_hidden;
 extern __typeof (__redirect_memmove) __memmove_avx_unaligned attribute_hidden;
+# ifdef HAVE_AVX512_ASM_SUPPORT
+  extern __typeof (__redirect_memmove) __memmove_avx512_no_vzeroupper attribute_hidden;
+# endif
 
 #endif
 
@@ -49,12 +52,18 @@ extern __typeof (__redirect_memmove) __memmove_avx_unaligned attribute_hidden;
    ifunc symbol properly.  */
 extern __typeof (__redirect_memmove) __libc_memmove;
 libc_ifunc (__libc_memmove,
-	    HAS_ARCH_FEATURE (AVX_Fast_Unaligned_Load)
+#ifdef HAVE_AVX512_ASM_SUPPORT
+	    HAS_ARCH_FEATURE (AVX512F_Usable)
+	      && HAS_ARCH_FEATURE (Prefer_No_VZEROUPPER)
+	    ? __memmove_avx512_no_vzeroupper
+	    :
+#endif
+	    (HAS_ARCH_FEATURE (AVX_Fast_Unaligned_Load)
 	    ? __memmove_avx_unaligned
 	    : (HAS_CPU_FEATURE (SSSE3)
 	       ? (HAS_ARCH_FEATURE (Fast_Copy_Backward)
 	          ? __memmove_ssse3_back : __memmove_ssse3)
-	       : __memmove_sse2));
+	       : __memmove_sse2)));
 
 strong_alias (__libc_memmove, memmove)
 
diff --git a/sysdeps/x86_64/multiarch/memmove_chk.c b/sysdeps/x86_64/multiarch/memmove_chk.c
index 60ed98fd40..f64da63180 100644
--- a/sysdeps/x86_64/multiarch/memmove_chk.c
+++ b/sysdeps/x86_64/multiarch/memmove_chk.c
@@ -26,10 +26,19 @@ extern __typeof (__memmove_chk) __memmove_chk_sse2 attribute_hidden;
 extern __typeof (__memmove_chk) __memmove_chk_ssse3 attribute_hidden;
 extern __typeof (__memmove_chk) __memmove_chk_ssse3_back attribute_hidden;
 extern __typeof (__memmove_chk) __memmove_chk_avx_unaligned attribute_hidden;
+# ifdef HAVE_AVX512_ASM_SUPPORT
+  extern __typeof (__memmove_chk) __memmove_chk_avx512_no_vzeroupper attribute_hidden;
+# endif
 
 #include "debug/memmove_chk.c"
 
 libc_ifunc (__memmove_chk,
+#ifdef HAVE_AVX512_ASM_SUPPORT
+	    HAS_ARCH_FEATURE (AVX512F_Usable)
+	      && HAS_ARCH_FEATURE (Prefer_No_VZEROUPPER)
+	    ? __memmove_chk_avx512_no_vzeroupper
+	    :
+#endif
 	    HAS_ARCH_FEATURE (AVX_Fast_Unaligned_Load) ? __memmove_chk_avx_unaligned :
 	    (HAS_CPU_FEATURE (SSSE3)
 	    ? (HAS_ARCH_FEATURE (Fast_Copy_Backward)
diff --git a/sysdeps/x86_64/multiarch/mempcpy-avx512-no-vzeroupper.S b/sysdeps/x86_64/multiarch/mempcpy-avx512-no-vzeroupper.S
new file mode 100644
index 0000000000..ccffb3193d
--- /dev/null
+++ b/sysdeps/x86_64/multiarch/mempcpy-avx512-no-vzeroupper.S
@@ -0,0 +1,22 @@
+/* mempcpy optimized with AVX512 for KNL hardware.

+   Copyright (C) 2016 Free Software Foundation, Inc.

+   This file is part of the GNU C Library.

+

+   The GNU C 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 C 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 C Library; if not, see

+   <http://www.gnu.org/licenses/>.  */

+

+#define USE_AS_MEMPCPY

+#define MEMCPY		__mempcpy_avx512_no_vzeroupper

+#define MEMCPY_CHK	__mempcpy_chk_avx512_no_vzeroupper

+#include "memcpy-avx512-no-vzeroupper.S"

diff --git a/sysdeps/x86_64/multiarch/mempcpy.S b/sysdeps/x86_64/multiarch/mempcpy.S
index 96ffb2881b..ed78623565 100644
--- a/sysdeps/x86_64/multiarch/mempcpy.S
+++ b/sysdeps/x86_64/multiarch/mempcpy.S
@@ -28,7 +28,15 @@
 ENTRY(__mempcpy)
 	.type	__mempcpy, @gnu_indirect_function
 	LOAD_RTLD_GLOBAL_RO_RDX
-	leaq	__mempcpy_sse2(%rip), %rax
+#ifdef HAVE_AVX512_ASM_SUPPORT
+	HAS_ARCH_FEATURE (AVX512F_Usable)
+	jz	1f
+	HAS_ARCH_FEATURE (Prefer_No_VZEROUPPER)
+	jz	1f
+	leaq    __mempcpy_avx512_no_vzeroupper(%rip), %rax
+	ret
+#endif
+1:	leaq	__mempcpy_sse2(%rip), %rax
 	HAS_CPU_FEATURE (SSSE3)
 	jz	2f
 	leaq	__mempcpy_ssse3(%rip), %rax
diff --git a/sysdeps/x86_64/multiarch/mempcpy_chk.S b/sysdeps/x86_64/multiarch/mempcpy_chk.S
index ae7a765224..6e8a89d38c 100644
--- a/sysdeps/x86_64/multiarch/mempcpy_chk.S
+++ b/sysdeps/x86_64/multiarch/mempcpy_chk.S
@@ -30,7 +30,15 @@
 ENTRY(__mempcpy_chk)
 	.type	__mempcpy_chk, @gnu_indirect_function
 	LOAD_RTLD_GLOBAL_RO_RDX
-	leaq	__mempcpy_chk_sse2(%rip), %rax
+#ifdef HAVE_AVX512_ASM_SUPPORT
+	HAS_ARCH_FEATURE (AVX512F_Usable)
+	jz	1f
+	HAS_ARCH_FEATURE (Prefer_No_VZEROUPPER)
+	jz	1f
+	leaq    __mempcpy_chk_avx512_no_vzeroupper(%rip), %rax
+	ret
+#endif
+1:	leaq	__mempcpy_chk_sse2(%rip), %rax
 	HAS_CPU_FEATURE (SSSE3)
 	jz	2f
 	leaq	__mempcpy_chk_ssse3(%rip), %rax