[PATCH] x86_64: memcpy/memmove family optimized with AVX512

[Andrew Senkevich <andrew dot n dot senkevich at gmail dot com>]

Hi,

here is 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.
Ok for trunk?

2016-01-12  Andrew Senkevich  <andrew.senkevich@intel.com>

        * sysdeps/x86_64/multiarch/Makefile: 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.

diff --git a/sysdeps/x86_64/multiarch/Makefile
b/sysdeps/x86_64/multiarch/Makefile
index b2e31ef..d234f4a 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 5f600dc..7746d79 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),
@@ -274,6 +280,9 @@ __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))

@@ -294,6 +303,9 @@ __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 0000000..462f038
--- /dev/null
+++ b/sysdeps/x86_64/multiarch/memcpy-avx512-no-vzeroupper.S
@@ -0,0 +1,418 @@
+/* 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)
+ 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
+
+#ifndef USE_AS_MEMMOVE
+L(1024bytesormore):
+ sub $0x200, %r9
+
+/* 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 $0x200, %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 $0x200, %rdi
+ cmp %r9, %rdi
+ jb L(gobble_512bytes_loop)
+ vmovups -0x200(%rcx), %zmm0
+ vmovups -0x1C0(%rcx), %zmm1
+ vmovups -0x180(%rcx), %zmm2
+ vmovups -0x140(%rcx), %zmm3
+ vmovups -0x100(%rcx), %zmm4
+ vmovups -0xC0(%rcx), %zmm5
+ vmovups -0x80(%rcx), %zmm6
+ vmovups -0x40(%rcx), %zmm7
+ vmovups %zmm0, (%r9)
+ vmovups %zmm1, 0x40(%r9)
+ vmovups %zmm2, 0x80(%r9)
+ vmovups %zmm3, 0xC0(%r9)
+ vmovups %zmm4, 0x100(%r9)
+ vmovups %zmm5, 0x140(%r9)
+ vmovups %zmm6, 0x180(%r9)
+ vmovups %zmm7, 0x1C0(%r9)
+ ret
+
+/* Align destination for access with non-temporal stores in the loop.  */
+L(preloop_large):
+ mov %rdi, %r8
+ and $-0x80, %rdi
+ add $0x80, %rdi
+ sub %rdi, %r8
+ vmovups (%rsi), %zmm0
+ vmovups 0x40(%rsi), %zmm1
+ vmovups %zmm0, (%rax)
+ vmovups %zmm1, 0x40(%rax)
+ sub %r8, %rsi
+ sub $0x100, %r9
+ prefetcht1 (%rsi)
+ prefetcht1 0x40(%rsi)
+ prefetcht1 0x80(%rsi)
+ prefetcht1 0xC0(%rsi)
+L(gobble_256bytes_nt_loop):
+ prefetcht1 0x100(%rsi)
+ prefetcht1 0x140(%rsi)
+ prefetcht1 0x180(%rsi)
+ prefetcht1 0x1C0(%rsi)
+ vmovups (%rsi), %zmm0
+ vmovups 0x40(%rsi), %zmm1
+ vmovups 0x80(%rsi), %zmm2
+ vmovups 0xC0(%rsi), %zmm3
+ add $0x100, %rsi
+ vmovntdq %zmm0, (%rdi)
+ vmovntdq %zmm1, 0x40(%rdi)
+ vmovntdq %zmm2, 0x80(%rdi)
+ vmovntdq %zmm3, 0xC0(%rdi)
+ add $0x100, %rdi
+ cmp %r9, %rdi
+ jb L(gobble_256bytes_nt_loop)
+ sfence
+ vmovups -0x100(%rcx), %zmm0
+ vmovups -0xC0(%rcx), %zmm1
+ vmovups -0x80(%rcx), %zmm2
+ vmovups -0x40(%rcx), %zmm3
+ vmovups %zmm0, (%r9)
+ vmovups %zmm1, 0x40(%r9)
+ vmovups %zmm2, 0x80(%r9)
+ vmovups %zmm3, 0xC0(%r9)
+ ret
+#else
+/* Memmove implementation.  */
+L(1024bytesormore):
+ cmp %rsi, %rdi
+ ja L(1024bytesormore_bkw)
+ prefetcht1 (%rsi)
+ prefetcht1 0x40(%rsi)
+ prefetcht1 0x80(%rsi)
+ prefetcht1 0xC0(%rsi)
+
+/* Loop with unaligned memory access.  */
+L(gobble_256bytes_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)
+ vmovups %zmm0, (%rdi)
+ vmovups %zmm1, 0x40(%rdi)
+ vmovups %zmm2, 0x80(%rdi)
+ vmovups %zmm3, 0xC0(%rdi)
+ sub $256, %rdx
+ add $256, %rsi
+ add $256, %rdi
+ cmp $256, %rdx
+ jae L(gobble_256bytes_loop)
+ jmp L(check)
+
+L(1024bytesormore_bkw):
+ prefetcht1 -0x100(%rcx)
+ prefetcht1 -0xC0(%rcx)
+ prefetcht1 -0x80(%rcx)
+ prefetcht1 -0x40(%rcx)
+
+/* Loop with unaligned memory access.  */
+L(gobble_256bytes_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)
+ vmovups %zmm0, -0x100(%r9)
+ vmovups %zmm1, -0xC0(%r9)
+ vmovups %zmm2, -0x80(%r9)
+ vmovups %zmm3, -0x40(%r9)
+ sub $256, %rdx
+ sub $256, %rcx
+ sub $256, %r9
+ cmp $256, %rdx
+ jae L(gobble_256bytes_loop_bkw)
+ jmp L(check)
+
+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)
+#endif
+END (MEMCPY)
+#endif
diff --git a/sysdeps/x86_64/multiarch/memcpy.S
b/sysdeps/x86_64/multiarch/memcpy.S
index 27fca29..64a1bcd 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 6476c62..a0d56d4 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 0000000..aaad0c5
--- /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 e844531..8da5640 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 60ed98f..f64da63 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 0000000..ccffb31
--- /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 96ffb28..ed78623 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 ae7a765..6e8a89d 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


--
WBR,
Andrew

Attachment: memmove-avx512_results.tar.bz2
Description: BZip2 compressed data

Attachment: memcpy-avx512_results.tar.bz2
Description: BZip2 compressed data