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Karol Stasiak 2023-01-27 18:16:02 +01:00
parent 1594d63a9a
commit ca7166d1ae
1 changed files with 50 additions and 0 deletions
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src/main/scala/millfork/assembly/mos/opt/IdentityPageOptimizations.scala Normal file
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package millfork.assembly.mos.opt
import millfork.assembly.mos.AddrMode._
import millfork.assembly.mos.{AssemblyLine, State}
import millfork.assembly.mos.Opcode._
import millfork.env.NumericConstant
object IdentityPageOptimizations {
val SimplifiableAccess = new RuleBasedAssemblyOptimization("Simplifiable identity page access",
needsFlowInfo = FlowInfoRequirement.NoRequirement,
(Elidable & HasOpcode(LDA) & HasAddrMode(AbsoluteX) & HasIdentityPageParameter) ~~> { c =>
List(AssemblyLine.implied(TXA))
},
(Elidable & HasOpcode(LDA) & HasAddrMode(AbsoluteY) & HasIdentityPageParameter) ~~> { c =>
List(AssemblyLine.implied(TYA))
},
)
val UseInsteadOfStack = new RuleBasedAssemblyOptimization("Use identity page instead of stack",
needsFlowInfo = FlowInfoRequirement.BackwardFlow,
(Elidable & HasOpcode(PHA)) ~
(Not(ConcernsX) & Not(ConcernsStack)).*.capture(0) ~
(Elidable & HasOpcode(TSX) & HasAddrMode(AbsoluteX) & HasIdentityPageParameter) ~
(Elidable & HasAddrMode(AbsoluteX) & HasParameterWhere{
case NumericConstant(0x101, _) => true
case _ => false
}).capture(1) ~
(Elidable & HasOpcode(INX)) ~
(Elidable & HasOpcode(TXS) & DoesntMatterWhatItDoesWith(State.X)) ~~> { (code, ctx) =>
List(AssemblyLine.implied(TAX)) ++ ctx.get[List[AssemblyLine]](0) ++ List(ctx.get[AssemblyLine](1).copy(parameter = ctx.identityPage))
},
(Elidable & HasOpcode(PHA)) ~
(Not(ConcernsY) & Not(ConcernsStack)).*.capture(0) ~
(Elidable & HasOpcode(TSX) & HasAddrMode(AbsoluteX) & HasIdentityPageParameter) ~
(Elidable & HasAddrMode(AbsoluteX) & HasParameterWhere{
case NumericConstant(0x101, _) => true
case _ => false
}).capture(1) ~
(Elidable & HasOpcode(INX)) ~
(Elidable & HasOpcode(TXS) & DoesntMatterWhatItDoesWith(State.Y)) ~~> { (code, ctx) =>
List(AssemblyLine.implied(TAY)) ++ ctx.get[List[AssemblyLine]](0) ++ List(ctx.get[AssemblyLine](1).copy(parameter = ctx.identityPage, addrMode = AbsoluteY))
},
)
val All: List[RuleBasedAssemblyOptimization] = List(
SimplifiableAccess,
UseInsteadOfStack)
}