From 219bfa538d69dee2c109c85659715b74e387c26a Mon Sep 17 00:00:00 2001
From: mykola2312 <49044616+mykola2312@users.noreply.github.com>
Date: Thu, 19 May 2022 01:04:20 +0300
Subject: [PATCH] implement _cu_memmove in AArch64

---
 arch/AArch64.S | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/arch/AArch64.S b/arch/AArch64.S
index 510bb63..9a98e09 100644
--- a/arch/AArch64.S
+++ b/arch/AArch64.S
@@ -47,6 +47,29 @@ _cu_memcpy:
     ret
 
 _cu_memmove:
+    // x0 - dst, x1 - src, x2 - size
+    cmp x0, x1
+    beq .move0
+    blt .less1
+
+    add x0, x0, x2
+    add x1, x1, x2
+    sub x0, x0, #1
+    sub x1, x1, #1
+.greater1:
+    ldrb w3, [x1]
+    strb w3, [x0]
+    sub x0, x0, #1
+    sub x1, x1, #1
+    subs x2, x2, #1
+    bne .greater1
+    b .move0
+.less1:
+    ldrb w3, [x1], #1
+    strb w3, [x0], #1
+    subs x2, x2, #1
+    bne .less1
+.move0:
     ret
 
 _cu_memcmp: