fix signed byte to word casting issue uw = 8888 + (bb as ubyte)

codeGenCpu6502/src/prog8/codegen/cpu6502/assignment/AssignmentAsmGen.kt

@@ -1830,8 +1830,9 @@ internal class AssignmentAsmGen(private val program: PtProgram,
                 RegisterOrPair.AY,
                 RegisterOrPair.XY,
                 in Cx16VirtualRegisters -> {
-                    // cast an ubyte value to a 16 bits register, just assign it and make use of the value extension
-                    return assignExpressionToRegister(value, target.register!!, false)
+                    assignExpressionToRegister(value, RegisterOrPair.A, false)
+                    assignRegisterByte(target, CpuRegister.A, false)
+                    return
                 }
                 else -> {}
             }

docs/source/todo.rst

@@ -1,9 +1,6 @@
 TODO
 ====
 
-- fix codegen signed byte to word casting issue  uw = 8888 + (bb as ubyte)
-
-- remove after(assignment from BeforeAsmAstChanger permanently once issues above fixed
 - gfx2/monogfx: use vera auto in/decrement in the flood fill routine (getpixels)
 - gfx2: use vera fx fill for horizontal_line of sufficient length?
 

examples/test.p8

@@ -4,15 +4,11 @@
 
 main {
     sub start() {
-        uword @shared uw = 5555
         byte @shared bb = -44
-
-        uw = (bb as ubyte) as uword
-        txt.print_uw(uw)            ; 212
-        txt.nl()
-
-        uw = 8888 + (bb as ubyte)   ; TODO fix 6502 codegen
+        uword uw = 8888 + (bb as ubyte)
         txt.print_uw(uw)            ; 9100
         txt.nl()
+        txt.print_uw(8888 + (bb as ubyte))            ; 9100
+        txt.nl()
     }
 }

gradle.properties

@@ -5,4 +5,4 @@ org.gradle.daemon=true
 kotlin.code.style=official
 javaVersion=11
 kotlinVersion=1.9.10
-version=9.5
+version=9.5.1