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6502: Various optimization fixes and improvements
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Karol Stasiak
parent
e280aca08b
commit
80efa95ba7
@ -23,7 +23,9 @@ object AlwaysGoodOptimizations {
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def getNextLabel(prefix: String) = f".$prefix%s__${counter.getAndIncrement()}%05d"
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val PointlessMath = new RuleBasedAssemblyOptimization("Pointless math",
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private def jvmFix(r: => RuleBasedAssemblyOptimization): RuleBasedAssemblyOptimization = r
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val PointlessMath = jvmFix(new RuleBasedAssemblyOptimization("Pointless math",
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needsFlowInfo = FlowInfoRequirement.BackwardFlow,
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(HasOpcode(CLC) & Elidable) ~
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(HasOpcode(ADC) & Elidable & MatchParameter(0)) ~
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@ -39,7 +41,7 @@ object AlwaysGoodOptimizations {
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AssemblyLine.implied(CLC),
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AssemblyLine.immediate(ADC, (ctx.get[Constant](0) + ctx.get[Constant](1)).quickSimplify),
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)),
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)
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))
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val PointlessAccumulatorShifting = new RuleBasedAssemblyOptimization("Pointless accumulator shifting",
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needsFlowInfo = FlowInfoRequirement.BackwardFlow,
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@ -333,7 +335,7 @@ object AlwaysGoodOptimizations {
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},
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)
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val PointlessStashingForLaterLoad = new RuleBasedAssemblyOptimization("Pointless stashing for later load",
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val PointlessStashingForLaterLoad = jvmFix(new RuleBasedAssemblyOptimization("Pointless stashing for later load",
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needsFlowInfo = FlowInfoRequirement.BackwardFlow,
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(Elidable & HasOpcode(LDA) & MatchAddrMode(0) & MatchParameter(1)) ~
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(Elidable & HasOpcode(STA) & MatchAddrMode(10) & MatchParameter(11) & DoesntMatterWhatItDoesWith(State.A, State.Z, State.N)) ~
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@ -382,7 +384,7 @@ object AlwaysGoodOptimizations {
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(Elidable & HasOpcode(TZA)) ~~> { code =>
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code.tail.init ++ List(code.head.copy(opcode = LDA), AssemblyLine.implied(TAZ))
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},
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)
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))
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val PointlessLoadBeforeReturn = new RuleBasedAssemblyOptimization("Pointless load before return",
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needsFlowInfo = FlowInfoRequirement.NoRequirement,
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@ -441,8 +443,8 @@ object AlwaysGoodOptimizations {
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operationPairBuilder(PHZ, PLZ, Not(ChangesIZ) & Not(ConcernsStack), Some(DISCARD_YF)),
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operationPairBuilder(INX, DEX, Not(ConcernsX) & Not(ReadsNOrZ), None),
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operationPairBuilder(DEX, INX, Not(ConcernsX) & Not(ReadsNOrZ), None),
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operationPairBuilder(INY, DEY, Not(ConcernsX) & Not(ReadsNOrZ), None),
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operationPairBuilder(DEY, INY, Not(ConcernsX) & Not(ReadsNOrZ), None),
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operationPairBuilder(INY, DEY, Not(ConcernsY) & Not(ReadsNOrZ), None),
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operationPairBuilder(DEY, INY, Not(ConcernsY) & Not(ReadsNOrZ), None),
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)
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@ -510,8 +512,8 @@ object AlwaysGoodOptimizations {
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operationPairBuilder3(PHB, Anything, PLB, Not(HasOpcodeIn(ChangesDataBankRegister)), None),
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operationPairBuilder3(INX, DoesntMatterWhatItDoesWith(State.N, State.Z), DEX, Not(ConcernsX) & Not(ReadsNOrZ), None),
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operationPairBuilder3(DEX, DoesntMatterWhatItDoesWith(State.N, State.Z), INX, Not(ConcernsX) & Not(ReadsNOrZ), None),
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operationPairBuilder3(INY, DoesntMatterWhatItDoesWith(State.N, State.Z), DEY, Not(ConcernsX) & Not(ReadsNOrZ), None),
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operationPairBuilder3(DEY, DoesntMatterWhatItDoesWith(State.N, State.Z), INY, Not(ConcernsX) & Not(ReadsNOrZ), None),
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operationPairBuilder3(INY, DoesntMatterWhatItDoesWith(State.N, State.Z), DEY, Not(ConcernsY) & Not(ReadsNOrZ), None),
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operationPairBuilder3(DEY, DoesntMatterWhatItDoesWith(State.N, State.Z), INY, Not(ConcernsY) & Not(ReadsNOrZ), None),
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operationPairBuilder4(
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LDA, DoesntMatterWhatItDoesWith(State.N, State.Z),
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Not(ConcernsA),
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@ -589,24 +591,48 @@ object AlwaysGoodOptimizations {
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needsFlowInfo = FlowInfoRequirement.BothFlows,
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(Elidable & HasOpcode(CLC) & HasClear(State.D)) ~
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(Elidable & HasOpcode(ADC) & HasImmediate(1)) ~
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(Elidable & HasOpcode(TAY) & DoesntMatterWhatItDoesWith(State.A, State.C)) ~~> { code =>
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(Elidable & HasOpcode(TAY) & DoesntMatterWhatItDoesWith(State.A, State.C, State.V)) ~~> { code =>
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List(AssemblyLine.implied(TAY), AssemblyLine.implied(INY))
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},
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(Elidable & HasOpcode(SEC) & HasClear(State.D)) ~
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(Elidable & HasOpcode(SBC) & HasImmediate(1)) ~
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(Elidable & HasOpcode(TAY) & DoesntMatterWhatItDoesWith(State.A, State.C)) ~~> { code =>
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(Elidable & HasOpcode(TAY) & DoesntMatterWhatItDoesWith(State.A, State.C, State.V)) ~~> { code =>
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List(AssemblyLine.implied(TAY), AssemblyLine.implied(DEY))
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},
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(Elidable & HasOpcode(CLC) & HasClear(State.D)) ~
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(Elidable & HasOpcode(ADC) & HasImmediate(1)) ~
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(Elidable & HasOpcode(TAX) & DoesntMatterWhatItDoesWith(State.A, State.C)) ~~> { code =>
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(Elidable & HasOpcode(TAX) & DoesntMatterWhatItDoesWith(State.A, State.C, State.V)) ~~> { code =>
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List(AssemblyLine.implied(TAX), AssemblyLine.implied(INX))
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},
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(Elidable & HasOpcode(SEC) & HasClear(State.D)) ~
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(Elidable & HasOpcode(SBC) & HasImmediate(1)) ~
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(Elidable & HasOpcode(TAX) & DoesntMatterWhatItDoesWith(State.A, State.C)) ~~> { code =>
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(Elidable & HasOpcode(TAX) & DoesntMatterWhatItDoesWith(State.A, State.C, State.V)) ~~> { code =>
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List(AssemblyLine.implied(TAX), AssemblyLine.implied(DEX))
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},
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(Elidable & HasOpcode(TXA)) ~
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(Elidable & HasOpcode(CLC) & HasClear(State.D)) ~
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(Elidable & HasOpcode(ADC) & HasImmediate(1)) ~
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(Elidable & HasOpcode(TAX) & DoesntMatterWhatItDoesWith(State.C, State.V)) ~~> { code =>
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List(AssemblyLine.implied(INX), AssemblyLine.implied(TXA))
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},
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(Elidable & HasOpcode(TXA)) ~
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(Elidable & HasOpcode(CLC) & HasClear(State.D)) ~
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(Elidable & HasOpcode(ADC) & HasImmediate(2)) ~
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(Elidable & HasOpcode(TAX) & DoesntMatterWhatItDoesWith(State.C, State.V)) ~~> { code =>
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List(AssemblyLine.implied(INX), AssemblyLine.implied(INX), AssemblyLine.implied(TXA))
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},
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(Elidable & HasOpcode(TYA)) ~
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(Elidable & HasOpcode(CLC) & HasClear(State.D)) ~
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(Elidable & HasOpcode(ADC) & HasImmediate(1)) ~
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(Elidable & HasOpcode(TAY) & DoesntMatterWhatItDoesWith(State.C, State.V)) ~~> { code =>
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List(AssemblyLine.implied(INY), AssemblyLine.implied(TYA))
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},
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(Elidable & HasOpcode(TYA)) ~
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(Elidable & HasOpcode(CLC) & HasClear(State.D)) ~
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(Elidable & HasOpcode(ADC) & HasImmediate(2)) ~
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(Elidable & HasOpcode(TAY) & DoesntMatterWhatItDoesWith(State.C, State.V)) ~~> { code =>
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List(AssemblyLine.implied(INY), AssemblyLine.implied(INY), AssemblyLine.implied(TYA))
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},
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)
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val BranchInPlaceRemoval = new RuleBasedAssemblyOptimization("Branch in place",
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@ -792,7 +818,7 @@ object AlwaysGoodOptimizations {
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}
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}
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val ModificationOfJustWrittenValue = new RuleBasedAssemblyOptimization("Modification of just written value",
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val ModificationOfJustWrittenValue = jvmFix(new RuleBasedAssemblyOptimization("Modification of just written value",
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needsFlowInfo = FlowInfoRequirement.BothFlows,
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modificationOfJustWrittenValue(STA, Absolute, MatchA(5), INC, Anything, atLeastTwo = false, Seq(), (c, i) => List(
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AssemblyLine.immediate(LDA, (c.get[Int](5) + i) & 0xff)
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@ -870,7 +896,7 @@ object AlwaysGoodOptimizations {
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(Elidable & HasOpcode(DEC) & Not(HasAddrMode(Implied)) & MatchAddrMode(3) & MatchParameter(0) & DoesntMatterWhatItDoesWith(State.N, State.Z)) ~
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(Linear & DoesNotConcernMemoryAt(3, 0) & DoesntChangeIndexingInAddrMode(3)).* ~
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(Elidable & HasOpcode(INC) & Not(HasAddrMode(Implied)) & MatchAddrMode(3) & MatchParameter(0) & DoesntMatterWhatItDoesWith(State.N, State.Z)) ~~> (_.init.tail),
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)
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))
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val ConstantFlowAnalysis = new RuleBasedAssemblyOptimization("Constant flow analysis",
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needsFlowInfo = FlowInfoRequirement.ForwardFlow,
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@ -903,8 +929,8 @@ object AlwaysGoodOptimizations {
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},
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)
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val LoadingOfJustWrittenValue = new RuleBasedAssemblyOptimization("Loading of just written value",
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needsFlowInfo = FlowInfoRequirement.ForwardFlow,
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val LoadingOfJustWrittenValue = jvmFix(new RuleBasedAssemblyOptimization("Loading of just written value",
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needsFlowInfo = FlowInfoRequirement.BothFlows,
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(HasOpcode(STA) & XContainsStackPointer & HasAddrMode(AbsoluteX) & MatchAddrMode(0) & MatchParameter(1) & MatchA(2) & HasParameterWhere(_ match {
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case NumericConstant(addr, _) => addr >= 0x100 && addr <= 0x1ff
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@ -944,7 +970,34 @@ object AlwaysGoodOptimizations {
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code.init :+ code.last.copy(addrMode = AddrMode.Immediate, parameter = NumericConstant(ctx.get[Int](2), 1))
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},
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)
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(HasOpcode(PHA)) ~
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(Linear & Not(ChangesA) & Not(ChangesStack) & Not(ChangesMemory)).* ~
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(Elidable & XContainsStackPointer & HasOpcode(LDA) & DoesntMatterWhatItDoesWith(State.N, State.Z) & HasAddrMode(AbsoluteX) & HasParameterWhere(p => p.quickSimplify match {
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case NumericConstant(n, _) => n == 0x101
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case _ => false
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})) ~~> (_.init),
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(HasOpcode(PHA)) ~
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(Linear & Not(ChangesA) & Not(ChangesStack) & Not(ChangesMemory)).* ~
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(Elidable & HasOpcode(LDA) & HasAddrMode(Stack) & DoesntMatterWhatItDoesWith(State.N, State.Z) & HasParameterWhere(p => p.quickSimplify match {
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case NumericConstant(n, _) => n == 1
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case _ => false
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})) ~~> (_.init),
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(HasOpcode(PHA)) ~
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(Linear & Not(ChangesA) & Not(ChangesStack) & Not(ChangesMemory)).* ~
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(Elidable & XContainsStackPointer & HasOpcode(LDA) & HasAddrMode(AbsoluteX) & HasParameterWhere(p => p.quickSimplify match {
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case NumericConstant(n, _) => n == 0x101
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case _ => false
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})) ~~> (code => code.init :+ AssemblyLine.immediate(ORA, 0)),
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(HasOpcode(PHA)) ~
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(Linear & Not(ChangesA) & Not(ChangesStack) & Not(ChangesMemory)).* ~
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(Elidable & HasOpcode(LDA) & HasAddrMode(Stack) & HasParameterWhere(p => p.quickSimplify match {
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case NumericConstant(n, _) => n == 1
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case _ => false
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})) ~~> (code => code.init :+ AssemblyLine.immediate(ORA, 0))
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))
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val PointlessStackStore = new RuleBasedAssemblyOptimization("Pointless stack store",
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needsFlowInfo = FlowInfoRequirement.BothFlows,
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