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6502: More optimizations

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This commit is contained in:
Karol Stasiak 2019-07-23 23:17:03 +02:00
parent a25f6ca3f6
commit b873030b29
1 changed files with 16 additions and 0 deletions
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16
src/main/scala/millfork/assembly/mos/opt/AlwaysGoodOptimizations.scala
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@ -667,21 +667,37 @@ object AlwaysGoodOptimizations {
(Elidable & HasOpcode(TAY) & DoesntMatterWhatItDoesWith(State.A, State.C, State.V)) ~~> { code =>
List(AssemblyLine.implied(TAY), AssemblyLine.implied(INY))
},
(Elidable & HasOpcode(ADC) & HasImmediate(1) & HasClear(State.D) & HasClear(State.C)) ~
(Elidable & HasOpcode(TAY) & DoesntMatterWhatItDoesWith(State.A, State.C, State.V)) ~~> { code =>
List(AssemblyLine.implied(TAY), AssemblyLine.implied(INY))
},
(Elidable & HasOpcode(SEC) & HasClear(State.D)) ~
(Elidable & HasOpcode(SBC) & HasImmediate(1)) ~
(Elidable & HasOpcode(TAY) & DoesntMatterWhatItDoesWith(State.A, State.C, State.V)) ~~> { code =>
List(AssemblyLine.implied(TAY), AssemblyLine.implied(DEY))
},
(Elidable & HasOpcode(SBC) & HasImmediate(1) & HasClear(State.D) & HasSet(State.C)) ~
(Elidable & HasOpcode(TAY) & DoesntMatterWhatItDoesWith(State.A, State.C, State.V)) ~~> { code =>
List(AssemblyLine.implied(TAY), AssemblyLine.implied(DEY))
},
(Elidable & HasOpcode(CLC) & HasClear(State.D)) ~
(Elidable & HasOpcode(ADC) & HasImmediate(1)) ~
(Elidable & HasOpcode(TAX) & DoesntMatterWhatItDoesWith(State.A, State.C, State.V)) ~~> { code =>
List(AssemblyLine.implied(TAX), AssemblyLine.implied(INX))
},
(Elidable & HasOpcode(ADC) & HasImmediate(1) & HasClear(State.D) & HasClear(State.C)) ~
(Elidable & HasOpcode(TAX) & DoesntMatterWhatItDoesWith(State.A, State.C, State.V)) ~~> { code =>
List(AssemblyLine.implied(TAX), AssemblyLine.implied(INX))
},
(Elidable & HasOpcode(SEC) & HasClear(State.D)) ~
(Elidable & HasOpcode(SBC) & HasImmediate(1)) ~
(Elidable & HasOpcode(TAX) & DoesntMatterWhatItDoesWith(State.A, State.C, State.V)) ~~> { code =>
List(AssemblyLine.implied(TAX), AssemblyLine.implied(DEX))
},
(Elidable & HasOpcode(SBC) & HasImmediate(1) & HasClear(State.D) & HasSet(State.C)) ~
(Elidable & HasOpcode(TAX) & DoesntMatterWhatItDoesWith(State.A, State.C, State.V)) ~~> { code =>
List(AssemblyLine.implied(TAX), AssemblyLine.implied(DEX))
},
(Elidable & HasOpcode(TXA)) ~
(Elidable & HasOpcode(CLC) & HasClear(State.D)) ~
(Elidable & HasOpcode(ADC) & HasImmediate(1)) ~