tweak pointer access, fix and optimize reading memory from a label as pointer

examples/test.p8

@@ -1,23 +1,46 @@
 %import textio
 %option no_sysinit
-%zeropage basicsafe
+%zeropage kernalsafe
 
 main {
     sub start() {
-        word @shared dx
-        uword @shared udx
-        dx++
-        udx++
-        dx = -5000
-        if abs(dx) < 9999
-            txt.print("yes1")
-        else
-            txt.print("no2")
+        ubyte[] array = [11,22,33,44,55,66,77,88,99]
+        uword @shared ptr = &array[5]
+        ubyte @shared offset
+
+
+        cx16.r0L = @(&start + 1)
+        cx16.r1L = @(&start - 1)
+        @(&start+1) = 99
+        @(&start-1) = 99
+
+;        @(ptr+1) = cx16.r0L
+;        @(ptr+2) = cx16.r0L
+;        @(ptr+offset) = cx16.r0L
+;        @(ptr-1) = cx16.r0L
+;        @(ptr-2) = cx16.r0L
+;        @(ptr-offset) = cx16.r0L
+
+
+;        cx16.r0L = @(ptr+1)
+;        cx16.r1L = @(ptr+2)
+;        cx16.r2L = @(ptr+offset)
+;        cx16.r3L = @(ptr-1)
+;        cx16.r4L = @(ptr-2)
+;        cx16.r5L = @(ptr-offset)
+
+
+
+;        %asm {{
+;            dec  p8v_ptr+1
+;            ldy  #255
+;            lda  (p8v_ptr),y
+;            inc  p8v_ptr+1
+;            sta  cx16.r0L
+;        }}
+
+        repeat {
+        }
 
-        dx = -15000
-        if abs(dx) < 9999
-            txt.print("yes2")
-        else
-            txt.print("no2")
     }
 }