Fixed unsafe_mem.compare not working correctly when both input pointers are the same

unsafe_mem.asm

@@ -12,6 +12,8 @@
 ;   - `<0` if the first segment is less than the second segment.
 ;   - `>0` if the first segment is greater than the second segment.
 pub compare:
+    cmp r1, r2
+    je _compare__is_eq
     ; Exclusive end point of the second segment.
     add r4, r3, r2
     ; Exclusive end point of the first segment.
@@ -62,7 +64,7 @@ _compare__low1:
     ; Otherwise, the target is that non-zero byte.
     ; Check if the target is out of bounds, i.e. the loop terminated through the "bounds check".
     cmp r1, r3
-    jae _compare__oob
+    jae _compare__is_eq
     ; r5 is the comparison result in the format of `cmp`. Convert it to the desired format.
     ; 00 => 0x40000000 > 0
     ; 01 => 0x00000000 = 0
@@ -70,6 +72,6 @@ _compare__low1:
     xor r1, r5, 1
     lsl r1, r1, 30
     jmp r13
-_compare__oob:
+_compare__is_eq:
     mov r1, 0
     jmp r13