diff --git a/libc/arch-arm64/generic/bionic/memcpy.S b/libc/arch-arm64/generic/bionic/memcpy.S
new file mode 100644
index 0000000..e1b1a72
--- /dev/null
+++ b/libc/arch-arm64/generic/bionic/memcpy.S
@@ -0,0 +1,184 @@
+/* Copyright (c) 2012, Linaro Limited
+   All rights reserved.
+
+   Redistribution and use in source and binary forms, with or without
+   modification, are permitted provided that the following conditions are met:
+       * Redistributions of source code must retain the above copyright
+         notice, this list of conditions and the following disclaimer.
+       * 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.
+       * Neither the name of the Linaro nor the
+         names of its contributors may be used to endorse or promote products
+         derived from this software without specific prior written permission.
+
+   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+   "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 COPYRIGHT
+   HOLDER 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.
+*/
+
+/* Assumptions:
+ *
+ * ARMv8-a, AArch64
+ * Unaligned accesses
+ *
+ */
+
+#include <private/bionic_asm.h>
+
+#define dstin	x0
+#define src	x1
+#define count	x2
+#define tmp1	x3
+#define tmp1w	w3
+#define tmp2	x4
+#define tmp2w	w4
+#define tmp3	x5
+#define tmp3w	w5
+#define dst	x6
+
+#define A_l	x7
+#define A_h	x8
+#define B_l	x9
+#define B_h	x10
+#define C_l	x11
+#define C_h	x12
+#define D_l	x13
+#define D_h	x14
+
+ENTRY(memcpy)
+
+	mov	dst, dstin
+	cmp	count, #64
+	b.ge	.Lcpy_not_short
+	cmp	count, #15
+	b.le	.Ltail15tiny
+
+	/* Deal with small copies quickly by dropping straight into the
+	 * exit block.  */
+.Ltail63:
+	/* Copy up to 48 bytes of data.  At this point we only need the
+	 * bottom 6 bits of count to be accurate.  */
+	ands	tmp1, count, #0x30
+	b.eq	.Ltail15
+	add	dst, dst, tmp1
+	add	src, src, tmp1
+	cmp	tmp1w, #0x20
+	b.eq	1f
+	b.lt	2f
+	ldp	A_l, A_h, [src, #-48]
+	stp	A_l, A_h, [dst, #-48]
+1:
+	ldp	A_l, A_h, [src, #-32]
+	stp	A_l, A_h, [dst, #-32]
+2:
+	ldp	A_l, A_h, [src, #-16]
+	stp	A_l, A_h, [dst, #-16]
+
+.Ltail15:
+	ands	count, count, #15
+	beq	1f
+	add	src, src, count
+	ldp	A_l, A_h, [src, #-16]
+	add	dst, dst, count
+	stp	A_l, A_h, [dst, #-16]
+1:
+	ret
+
+.Ltail15tiny:
+	/* Copy up to 15 bytes of data.  Does not assume additional data
+	   being copied.  */
+	tbz	count, #3, 1f
+	ldr	tmp1, [src], #8
+	str	tmp1, [dst], #8
+1:
+	tbz	count, #2, 1f
+	ldr	tmp1w, [src], #4
+	str	tmp1w, [dst], #4
+1:
+	tbz	count, #1, 1f
+	ldrh	tmp1w, [src], #2
+	strh	tmp1w, [dst], #2
+1:
+	tbz	count, #0, 1f
+	ldrb	tmp1w, [src]
+	strb	tmp1w, [dst]
+1:
+	ret
+
+.Lcpy_not_short:
+	/* We don't much care about the alignment of DST, but we want SRC
+	 * to be 128-bit (16 byte) aligned so that we don't cross cache line
+	 * boundaries on both loads and stores.  */
+	neg	tmp2, src
+	ands	tmp2, tmp2, #15		/* Bytes to reach alignment.  */
+	b.eq	2f
+	sub	count, count, tmp2
+	/* Copy more data than needed; it's faster than jumping
+	 * around copying sub-Quadword quantities.  We know that
+	 * it can't overrun.  */
+	ldp	A_l, A_h, [src]
+	add	src, src, tmp2
+	stp	A_l, A_h, [dst]
+	add	dst, dst, tmp2
+	/* There may be less than 63 bytes to go now.  */
+	cmp	count, #63
+	b.le	.Ltail63
+2:
+	subs	count, count, #128
+	b.ge	.Lcpy_body_large
+	/* Less than 128 bytes to copy, so handle 64 here and then jump
+	 * to the tail.  */
+	ldp	A_l, A_h, [src]
+	ldp	B_l, B_h, [src, #16]
+	ldp	C_l, C_h, [src, #32]
+	ldp	D_l, D_h, [src, #48]
+	stp	A_l, A_h, [dst]
+	stp	B_l, B_h, [dst, #16]
+	stp	C_l, C_h, [dst, #32]
+	stp	D_l, D_h, [dst, #48]
+	tst	count, #0x3f
+	add	src, src, #64
+	add	dst, dst, #64
+	b.ne	.Ltail63
+	ret
+
+	/* Critical loop.  Start at a new cache line boundary.  Assuming
+	 * 64 bytes per line this ensures the entire loop is in one line.  */
+	.p2align 6
+.Lcpy_body_large:
+	/* There are at least 128 bytes to copy.  */
+	ldp	A_l, A_h, [src, #0]
+	sub	dst, dst, #16		/* Pre-bias.  */
+	ldp	B_l, B_h, [src, #16]
+	ldp	C_l, C_h, [src, #32]
+	ldp	D_l, D_h, [src, #48]!	/* src += 64 - Pre-bias.  */
+1:
+	stp	A_l, A_h, [dst, #16]
+	ldp	A_l, A_h, [src, #16]
+	stp	B_l, B_h, [dst, #32]
+	ldp	B_l, B_h, [src, #32]
+	stp	C_l, C_h, [dst, #48]
+	ldp	C_l, C_h, [src, #48]
+	stp	D_l, D_h, [dst, #64]!
+	ldp	D_l, D_h, [src, #64]!
+	subs	count, count, #64
+	b.ge	1b
+	stp	A_l, A_h, [dst, #16]
+	stp	B_l, B_h, [dst, #32]
+	stp	C_l, C_h, [dst, #48]
+	stp	D_l, D_h, [dst, #64]
+	add	src, src, #16
+	add	dst, dst, #64 + 16
+	tst	count, #0x3f
+	b.ne	.Ltail63
+	ret
+END(memcpy)