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optimized when asm
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c1343a78f1
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@ -32,6 +32,15 @@ fun optimizeAssembly(lines: MutableList<String>): Int {
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if(removeLines.isNotEmpty()) {
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for (i in removeLines.reversed())
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lines.removeAt(i)
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linesByFour = getLinesBy(lines, 4)
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numberOfOptimizations++
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}
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removeLines = optimizeCmpSequence(linesByFour)
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if(removeLines.isNotEmpty()) {
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for (i in removeLines.reversed())
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lines.removeAt(i)
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linesByFour = getLinesBy(lines, 4)
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numberOfOptimizations++
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}
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@ -40,6 +49,7 @@ fun optimizeAssembly(lines: MutableList<String>): Int {
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if(removeLines.isNotEmpty()) {
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for (i in removeLines.reversed())
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lines.removeAt(i)
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linesByFourteen = getLinesBy(lines, 14)
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numberOfOptimizations++
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}
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@ -48,6 +58,27 @@ fun optimizeAssembly(lines: MutableList<String>): Int {
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return numberOfOptimizations
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}
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fun optimizeCmpSequence(linesByFour: List<List<IndexedValue<String>>>): List<Int> {
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// the when statement (on bytes) generates a sequence of:
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// lda $ce01,x
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// cmp #$20
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// beq check_prog8_s72choice_32
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// lda $ce01,x
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// cmp #$21
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// beq check_prog8_s73choice_33
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// the repeated lda can be removed
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val removeLines = mutableListOf<Int>()
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for(lines in linesByFour) {
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if(lines[0].value.trim()=="lda ${(ESTACK_LO+1).toHex()},x" &&
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lines[1].value.trim().startsWith("cmp ") &&
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lines[2].value.trim().startsWith("beq ") &&
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lines[3].value.trim()=="lda ${(ESTACK_LO+1).toHex()},x") {
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removeLines.add(lines[3].index) // remove the second lda
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}
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}
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return removeLines
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}
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fun optimizeUselessStackByteWrites(linesByFour: List<List<IndexedValue<String>>>): List<Int> {
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// sta on stack, dex, inx, lda from stack -> eliminate this useless stack byte write
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// this is a lot harder for word values because the instruction sequence varies.
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@ -132,7 +163,7 @@ fun optimizeSameAssignments(linesByFourteen: List<List<IndexedValue<String>>>):
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}
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private fun getLinesBy(lines: MutableList<String>, windowSize: Int) =
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// all lines (that aren't empty or comments) in sliding pairs of 2
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// all lines (that aren't empty or comments) in sliding windows of certain size
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lines.withIndex().filter { it.value.isNotBlank() && !it.value.trimStart().startsWith(';') }.windowed(windowSize, partialWindows = false)
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private fun optimizeStoreLoadSame(linesByFour: List<List<IndexedValue<String>>>): List<Int> {
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