remove redundant asm optimizer

codeGenCpu6502/src/prog8/codegen/cpu6502/AsmOptimizer.kt

@@ -22,13 +22,6 @@ internal fun optimizeAssembly(lines: MutableList<String>, machine: IMachineDefin
         numberOfOptimizations++
     }
 
-    mods = optimizeCmpSequence(linesByFour)
-    if(mods.isNotEmpty()) {
-        apply(mods, lines)
-        linesByFour = getLinesBy(lines, 4)
-        numberOfOptimizations++
-    }
-
     mods = optimizeStoreLoadSame(linesByFour, machine, symbolTable)
     if(mods.isNotEmpty()) {
         apply(mods, lines)
@@ -90,27 +83,6 @@ private fun getLinesBy(lines: MutableList<String>, windowSize: Int) =
 // all lines (that aren't empty or comments) in sliding windows of certain size
         lines.withIndex().filter { it.value.isNotBlank() && !it.value.trimStart().startsWith(';') }.windowed(windowSize, partialWindows = false)
 
-private fun optimizeCmpSequence(linesByFour: List<List<IndexedValue<String>>>): List<Modification> {
-    // when statement (on bytes) generates a sequence of:
-    //	 lda  $ce01,x
-    //	 cmp  #$20
-    //	 beq  check_prog8_s72choice_32
-    //	 lda  $ce01,x
-    //	 cmp  #$21
-    //	 beq  check_prog8_s73choice_33
-    // the repeated lda can be removed
-    val mods = mutableListOf<Modification>()
-//    for(lines in linesByFour) {
-//        if(lines[0].value.trim()=="lda  P8ESTACK_LO+1,x" &&
-//                lines[1].value.trim().startsWith("cmp ") &&
-//                lines[2].value.trim().startsWith("beq ") &&
-//                lines[3].value.trim()=="lda  P8ESTACK_LO+1,x") {
-//            mods.add(Modification(lines[3].index, true, null)) // remove the second lda
-//        }
-//    }
-    return mods
-}
-
 private fun optimizeSameAssignments(
     linesByFourteen: List<List<IndexedValue<String>>>,
     machine: IMachineDefinition,

docs/source/todo.rst

@@ -1,7 +1,6 @@
 TODO
 ====
 
-- (branch): fix optimizeCmpSequence in AsmOptimizer
 - (branch): fix up cx16/keyboardhandler.p8 X register shenanigans
 
 - IR: instructions that do type conversion (SZ etc, CONCAT, SGN) should put the result in a DIFFERENT register.

examples/test.p8

@@ -5,27 +5,15 @@ main
 {
     sub start()
     {
-        word zc = -5583
-        txt.print_w(zc)
-        txt.spc()
-        txt.print_w(zc>>10)  ; -6
-        txt.nl()
+        byte zc = -55
 
-        txt.print_w(zc)
-        txt.spc()
-        txt.print_w(zc>>4)   ; -349
-        txt.nl()
-
-        txt.print_w(zc)
-        txt.spc()
-        txt.print_w(zc>>10)  ; -6
-        txt.nl()
-
-        cx16.r1L = (zc>>10) as ubyte
-        txt.print_ub(cx16.r1L)      ; 250
-        txt.nl()
-        cx16.r1L = (zc>>4) as ubyte
-        txt.print_ub(cx16.r1L)      ; 163
-        txt.nl()
+        when zc*3 {
+            123 -> zc++
+            124 -> zc++
+            125 -> zc++
+            121 -> zc++
+            120 -> zc++
+            else -> zc++
+        }
     }
 }