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-rw-r--r--src/string/x86_64/memcpy.s22
1 files changed, 22 insertions, 0 deletions
diff --git a/src/string/x86_64/memcpy.s b/src/string/x86_64/memcpy.s
new file mode 100644
index 00000000..1282dc3b
--- /dev/null
+++ b/src/string/x86_64/memcpy.s
@@ -0,0 +1,22 @@
+.global memcpy
+.type memcpy,@function
+memcpy:
+	mov %rdi,%rax
+	cmp $8,%rdx
+	jc 1f
+	test $7,%edi
+	jz 1f
+2:	movsb
+	dec %rdx
+	test $7,%edi
+	jnz 2b
+1:	mov %rdx,%rcx
+	shr $3,%rcx
+	rep
+	movsq
+	and $7,%edx
+	jz 1f
+2:	movsb
+	dec %edx
+	jnz 2b
+1:	ret