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https://github.com/irmen/prog8.git
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better asm code for repeat loops
This commit is contained in:
Irmen de Jong
parent
cf6ea63fa6
commit
53e9ad5088
@ -671,10 +671,8 @@ internal class AsmGen(private val program: Program,
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}
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private fun translate(stmt: RepeatLoop) {
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// TODO more optimized code possible now that continue is gone?
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val repeatLabel = makeLabel("repeat")
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val endLabel = makeLabel("repeatend")
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val counterLabel = makeLabel("repeatcounter")
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loopEndLabels.push(endLabel)
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when (stmt.iterations) {
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@ -691,13 +689,13 @@ internal class AsmGen(private val program: Program,
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throw AssemblyError("invalid number of iterations")
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when {
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iterations == 0 -> {}
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iterations <= 255 -> {
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out(" lda #${iterations}")
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repeatByteCountInA(counterLabel, repeatLabel, endLabel, stmt.body)
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iterations <= 256 -> {
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out(" lda #${iterations and 255}")
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repeatByteCountInA(iterations, repeatLabel, endLabel, stmt.body)
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}
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else -> {
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out(" lda #<${iterations} | ldy #>${iterations}")
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repeatWordCountInAY(counterLabel, repeatLabel, endLabel, stmt.body)
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repeatWordCountInAY(iterations, repeatLabel, endLabel, stmt.body)
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}
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}
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}
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@ -707,11 +705,11 @@ internal class AsmGen(private val program: Program,
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when(vardecl.datatype) {
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DataType.UBYTE, DataType.BYTE -> {
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out(" lda $name")
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repeatByteCountInA(counterLabel, repeatLabel, endLabel, stmt.body)
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repeatByteCountInA(null, repeatLabel, endLabel, stmt.body)
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}
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DataType.UWORD, DataType.WORD -> {
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out(" lda $name | ldy $name+1")
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repeatWordCountInAY(counterLabel, repeatLabel, endLabel, stmt.body)
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repeatWordCountInAY(null, repeatLabel, endLabel, stmt.body)
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}
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else -> throw AssemblyError("invalid loop variable datatype $vardecl")
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}
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@ -722,11 +720,11 @@ internal class AsmGen(private val program: Program,
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when (dt) {
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in ByteDatatypes -> {
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out(" inx | lda ${ESTACK_LO_HEX},x")
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repeatByteCountInA(counterLabel, repeatLabel, endLabel, stmt.body)
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repeatByteCountInA(null, repeatLabel, endLabel, stmt.body)
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}
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in WordDatatypes -> {
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out(" inx | lda ${ESTACK_LO_HEX},x | ldy ${ESTACK_HI_HEX},x")
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repeatWordCountInAY(counterLabel, repeatLabel, endLabel, stmt.body)
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repeatWordCountInAY(null, repeatLabel, endLabel, stmt.body)
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}
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else -> throw AssemblyError("invalid loop expression datatype $dt")
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}
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@ -736,9 +734,9 @@ internal class AsmGen(private val program: Program,
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loopEndLabels.pop()
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}
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private fun repeatWordCountInAY(counterVar: String, repeatLabel: String, endLabel: String, body: AnonymousScope) {
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private fun repeatWordCountInAY(constIterations: Int?, repeatLabel: String, endLabel: String, body: AnonymousScope) {
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// note: A/Y must have been loaded with the number of iterations already!
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// TODO allocate word counterVar on zeropage preferrably
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val counterVar = makeLabel("repeatcounter")
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out("""
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sta $counterVar
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sty $counterVar+1
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@ -752,29 +750,42 @@ $repeatLabel lda $counterVar
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+ dec $counterVar
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""")
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translate(body)
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out("""
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jmp $repeatLabel
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$counterVar .word 0
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$endLabel""")
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out(" jmp $repeatLabel")
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if(constIterations!=null && constIterations>=16 && zeropage.available() > 1) {
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// allocate count var on ZP
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val zpAddr = zeropage.allocate(counterVar, DataType.UWORD, body.position, errors)
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out("""$counterVar = $zpAddr ; auto zp UWORD""")
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} else {
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out("""
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$counterVar .word 0""")
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}
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out(endLabel)
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}
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private fun repeatByteCountInA(counterVar: String, repeatLabel: String, endLabel: String, body: AnonymousScope) {
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private fun repeatByteCountInA(constIterations: Int?, repeatLabel: String, endLabel: String, body: AnonymousScope) {
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// note: A must have been loaded with the number of iterations already!
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// TODO allocate word counterVar on zeropage preferrably
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val counterVar = makeLabel("repeatcounter")
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out("""
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sta $counterVar
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$repeatLabel lda $counterVar
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beq $endLabel
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dec $counterVar""")
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sta $counterVar
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$repeatLabel""")
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translate(body)
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out("""
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jmp $repeatLabel
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$counterVar .byte 0
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$endLabel""")
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dec $counterVar
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bne $repeatLabel
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beq $endLabel""")
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if(constIterations!=null && constIterations>=16 && zeropage.available() > 0) {
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// allocate count var on ZP
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val zpAddr = zeropage.allocate(counterVar, DataType.UBYTE, body.position, errors)
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out("""$counterVar = $zpAddr ; auto zp UBYTE""")
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} else {
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out("""
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$counterVar .byte 0""")
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}
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out(endLabel)
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}
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private fun translate(stmt: WhileLoop) {
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// TODO more optimized code possible now that continue is gone?
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val whileLabel = makeLabel("while")
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val endLabel = makeLabel("whileend")
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loopEndLabels.push(endLabel)
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@ -801,7 +812,6 @@ $endLabel""")
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}
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private fun translate(stmt: UntilLoop) {
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// TODO more optimized code possible now that continue is gone?
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val repeatLabel = makeLabel("repeat")
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val endLabel = makeLabel("repeatend")
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loopEndLabels.push(endLabel)
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@ -314,7 +314,7 @@ $loopLabel sty $indexVar
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beq $endLabel""")
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}
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if(length>=16 && asmgen.zeropage.available() > 0) {
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// allocate index var on ZP if possible
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// allocate index var on ZP
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val zpAddr = asmgen.zeropage.allocate(indexVar, DataType.UBYTE, stmt.position, asmgen.errors)
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asmgen.out("""$indexVar = $zpAddr ; auto zp UBYTE""")
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} else {
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@ -353,7 +353,7 @@ $loopLabel sty $indexVar
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beq $endLabel""")
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}
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if(length>=16 && asmgen.zeropage.available() > 0) {
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// allocate index var on ZP if possible
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// allocate index var on ZP
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val zpAddr = asmgen.zeropage.allocate(indexVar, DataType.UBYTE, stmt.position, asmgen.errors)
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asmgen.out("""$indexVar = $zpAddr ; auto zp UBYTE""")
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} else {
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@ -293,8 +293,10 @@ internal class StatementOptimizer(private val program: Program,
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errors.warn("iterations is always 0, removed loop", iter.position)
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return listOf(IAstModification.Remove(repeatLoop, parent))
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}
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if (iterations == 1)
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if (iterations == 1) {
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errors.warn("iterations is always 1", iter.position)
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return listOf(IAstModification.ReplaceNode(repeatLoop, repeatLoop.body, parent))
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}
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}
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return noModifications
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}
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@ -6,50 +6,36 @@
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main {
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sub start() {
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byte[] data = [11,22,33,44,55,66]
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ubyte[256] data256 = 1
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word[] dataw = [1111,2222,3333,4444,5555,6666]
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uword[128] dataw128 = 1
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uword count=0
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ubyte u
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byte d
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word w
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uword uw
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for u in "hello" {
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c64scr.print_ub(u)
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c64.CHROUT(',')
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count=0
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repeat 10 {
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count++
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}
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c64scr.print_uw(count)
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c64.CHROUT('\n')
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for d in data {
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c64scr.print_b(d)
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c64.CHROUT(',')
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count=0
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repeat 255 {
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count++
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}
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c64scr.print_uw(count)
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c64.CHROUT('\n')
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data256[0]=0
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data256[254]=254
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data256[255]=255
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for u in data256 {
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c64scr.print_ub(u)
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c64.CHROUT(',')
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count=0
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repeat 256 {
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count++
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}
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c64scr.print_uw(count)
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c64.CHROUT('\n')
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for w in dataw {
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c64scr.print_w(w)
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c64.CHROUT(',')
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count=0
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repeat 40000 {
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count++
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}
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c64scr.print_uw(count)
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c64.CHROUT('\n')
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dataw128[0] = 0
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dataw128[126] =126
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dataw128[127] =127
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for uw in dataw128 {
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c64scr.print_uw(uw)
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c64.CHROUT(',')
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}
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c64.CHROUT('\n')
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}
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}
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