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Few more minor optimizations

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This commit is contained in:
Karol Stasiak 2019-04-18 02:03:00 +02:00
parent af84a214bb
commit 85841c6395
3 changed files with 49 additions and 1 deletions
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5
src/main/scala/millfork/assembly/mos/opt/AlwaysGoodOptimizations.scala
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@ -1699,6 +1699,11 @@ object AlwaysGoodOptimizations {
(Elidable & HasOpcodeIn(ROL, ROR) & MatchAddrMode(0) & MatchParameter(1) & DoesntMatterWhatItDoesWith(State.Z, State.N)) ~~> { code =>
code.last.copy(addrMode = AddrMode.Implied, parameter = Constant.Zero) :: code.init
},
(Elidable & HasOpcode(STA) & MatchAddrMode(0) & MatchParameter(1)) ~
(Linear & DoesNotConcernMemoryAt(0, 1) & DoesntChangeIndexingInAddrMode(0) & Not(ConcernsA)).* ~
(Elidable & HasOpcodeIn(ROL, ROR, LSR, ASL) & MatchAddrMode(0) & MatchParameter(1) & DoesntMatterWhatItDoesWith(State.A)) ~~> { code =>
code.tail.init ++ List(code.last.copy(addrMode = AddrMode.Implied, parameter = Constant.Zero), code.head)
},
)
val SmarterShiftingBytes = new RuleBasedAssemblyOptimization("Smarter shifting of bytes",

28
src/main/scala/millfork/assembly/z80/opt/LaterI80Optimizations.scala
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@ -5,6 +5,7 @@ import millfork.assembly.z80._
import millfork.node.ZRegister
import ZOpcode._
import ZRegister._
import millfork.env.Constant
/**
@ -46,6 +47,33 @@ object LaterI80Optimizations {
(Elidable & HasOpcode(DEC) & HasRegisterParam(A) & DoesntMatterWhatItDoesWithFlags) ~
(HasOpcode(LABEL) & MatchParameter(0)) ~~> (code => List(ZLine.implied(CCF), ZLine.imm8(SBC, 0), code.last)),
(Elidable & Is8BitLoadTo(B) & Match8BitImmediate(1)) ~
(Elidable & Is8BitLoadTo(C) & Match8BitImmediate(0)) ~~> { (code, ctx) =>
val l = ctx.get[Constant](0)
val h = ctx.get[Constant](1)
List(ZLine.ldImm16(BC, h.asl(8).+(l).quickSimplify).pos(code.map(_.source)))
},
(Elidable & Is8BitLoadTo(C) & Match8BitImmediate(0)) ~
(Elidable & Is8BitLoadTo(B) & Match8BitImmediate(1)) ~~> { (code, ctx) =>
val l = ctx.get[Constant](0)
val h = ctx.get[Constant](1)
List(ZLine.ldImm16(BC, h.asl(8).+(l).quickSimplify).pos(code.map(_.source)))
},
(Elidable & Is8BitLoadTo(D) & Match8BitImmediate(1)) ~
(Elidable & Is8BitLoadTo(E) & Match8BitImmediate(0)) ~~> { (code, ctx) =>
val l = ctx.get[Constant](0)
val h = ctx.get[Constant](1)
List(ZLine.ldImm16(DE, h.asl(8).+(l).quickSimplify).pos(code.map(_.source)))
},
(Elidable & Is8BitLoadTo(E) & Match8BitImmediate(0)) ~
(Elidable & Is8BitLoadTo(D) & Match8BitImmediate(1)) ~~> { (code, ctx) =>
val l = ctx.get[Constant](0)
val h = ctx.get[Constant](1)
List(ZLine.ldImm16(DE, h.asl(8).+(l).quickSimplify).pos(code.map(_.source)))
},
)
val FreeHL = new RuleBasedAssemblyOptimization("Free HL (later)",

17
src/main/scala/millfork/assembly/z80/opt/LaterIntel8080Optimizations.scala
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@ -5,6 +5,7 @@ import millfork.assembly.z80.{ZLine, ZOpcode}
import millfork.node.ZRegister
import ZOpcode._
import ZRegister._
import millfork.env.Constant
/**
* @author Karol Stasiak
@ -24,8 +25,22 @@ object LaterIntel8080Optimizations {
},
)
val Store16BitConstantsDirectly = new RuleBasedAssemblyOptimization("Store 16-bit constants directly ",
needsFlowInfo = FlowInfoRequirement.BothFlows,
(Elidable & Is8BitLoad(MEM_ABS_8, A) & MatchParameter(1) & MatchRegister(A, 0)) ~
(Elidable & Is8BitLoad(MEM_ABS_8, A) & MatchParameter(2) & DoesntMatterWhatItDoesWith(A) & DoesntMatterWhatItDoesWithFlags & DoesntMatterWhatItDoesWith(HL)) ~
Where(ctx => ctx.get[Constant](1).+(1).quickSimplify == ctx.get[Constant](2)) ~~> { (code, ctx) =>
val l = ctx.get[Int](0)
val addr = ctx.get[Constant](1)
List(
ZLine.ldImm16(HL, 0x101 * l).pos(code.head.source),
ZLine.ldAbs16(addr, HL).pos(code.tail.map(_.source)))
},
)
val All: List[AssemblyOptimization[ZLine]] = List(
UseExDeHl
UseExDeHl, Store16BitConstantsDirectly
)
}