ir: ignore empty chunks instead of crashing

codeGenIntermediate/src/prog8/codegen/intermediate/IRCodeGen.kt

@@ -283,15 +283,10 @@ class IRCodeGen(
             else -> TODO("missing codegen for $node")
         }
 
-        chunks.forEach { chunk ->
-            require(chunk.isNotEmpty() || chunk.label != null) {
-                "chunk should have instructions and/or a label"
-            }
-        }
+        val nonEmptyChunks = chunks.filter { it.isNotEmpty() || it.label != null }
+        nonEmptyChunks.filterIsInstance<IRCodeChunk>().firstOrNull()?.appendSrcPosition(node.position)
 
-        chunks.filterIsInstance<IRCodeChunk>().firstOrNull()?.appendSrcPosition(node.position)
-
-        return chunks
+        return nonEmptyChunks
     }
 
     private fun readBinaryData(node: PtIncludeBinary): Collection<UByte> {

docs/source/todo.rst

@@ -2,6 +2,9 @@
 TODO
 ====
 
+- 10 * (uw/10)  is correct, (uw/10) * 10 fails with -noopt    10 * (uw/10) needs -noopt to work correctly
+- don't print the leading space in print_f()
+- uword scanline_buf = memory("scanline", 320, 0)   different result when inside a sub or outside a sub??! (imageviewer iff module)
 - [on branch: shortcircuit] investigate McCarthy evaluation again? this may also reduce code size perhaps for things like if a>4 or a<2 ....
 - once VAL_1 is merged into the kernal properly, remove all the workarounds in cx16 floats.parse_f()
 

examples/test.p8

@@ -1,25 +1,13 @@
 %import textio
-%import floats
-%import string
 %zeropage basicsafe
 %option no_sysinit
 
 main {
     sub start() {
-        str buffer = "???????????????????????????"
-        repeat {
-            txt.print("enter number: ")
-            void txt.input_chars(buffer)
-            txt.print("\nprog8's parse_f: ")
-            float value = floats.parse_f(buffer)
-            floats.print_f(value)
-
-            ; floats.VAL_1 is defined as:
-            ; romsub $fe09 = VAL_1(uword string @XY, ubyte length @A) clobbers(A,X,Y) -> float @FAC1
-;            txt.print("\nrom val_1: ")
-;            value = floats.VAL_1(buffer, string.length(buffer))
-;            floats.print_f(value)
-            txt.nl()
-        }
+        ubyte uw = 97
+        txt.print_ub( 10 * (uw/10) )    ; 90
+        txt.nl()
+        txt.print_ub( (uw/10) * 10 )    ; 90
+        txt.nl()
     }
 }