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8080: better handling of separate byte pairs

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This commit is contained in:
Karol Stasiak 2018-12-19 22:29:49 +01:00
parent 8582f0974d
commit 98585fcc38
1 changed files with 44 additions and 5 deletions
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49
src/main/scala/millfork/compiler/z80/Z80ExpressionCompiler.scala
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@ -451,21 +451,60 @@ object Z80ExpressionCompiler extends AbstractExpressionCompiler[ZLine] {
val hi = compileToA(ctx, h)
val lo = compileToA(ctx, l)
def xxx(hr: ZRegister.Value, lr: ZRegister.Value): List[ZLine] = {
def xxx(hr: ZRegister.Value, lr: ZRegister.Value, allowRedirect: Boolean = false): List[ZLine] = {
if (!lo.exists(x => x.changesRegister(hr) || x.readsRegister(hr))) {
hi ++ List(ZLine.ld8(hr, ZRegister.A)) ++
lo ++ List(ZLine.ld8(lr, ZRegister.A))
} else if (!hi.exists(x => x.changesRegister(lr) || x.readsRegister(lr))) {
lo ++ List(ZLine.ld8(lr, ZRegister.A)) ++
hi ++ List(ZLine.ld8(hr, ZRegister.A))
} else ???
} else if (allowRedirect) {
hr match {
case ZRegister.H =>
val viaDe = xxx(ZRegister.D, ZRegister.E)
if (viaDe.nonEmpty) {
viaDe ++ List(ZLine.ld8(ZRegister.L, ZRegister.E), ZLine.ld8(ZRegister.H, ZRegister.D))
} else {
val viaBc = xxx(ZRegister.B, ZRegister.C)
if (viaBc.nonEmpty) {
viaBc ++ List(ZLine.ld8(ZRegister.L, ZRegister.C), ZLine.ld8(ZRegister.H, ZRegister.B))
} else {
???
}
}
case ZRegister.B =>
val viaHl = xxx(ZRegister.H, ZRegister.L)
if (viaHl.nonEmpty) {
viaHl ++ List(ZLine.ld8(ZRegister.C, ZRegister.L), ZLine.ld8(ZRegister.B, ZRegister.H))
} else {
val viaDe = xxx(ZRegister.D, ZRegister.E)
if (viaDe.nonEmpty) {
viaDe ++ List(ZLine.ld8(ZRegister.C, ZRegister.E), ZLine.ld8(ZRegister.B, ZRegister.D))
} else {
???
}
}
case ZRegister.D =>
val viaHl = xxx(ZRegister.H, ZRegister.L)
if (viaHl.nonEmpty) {
viaHl ++ List(ZLine.ld8(ZRegister.E, ZRegister.L), ZLine.ld8(ZRegister.D, ZRegister.H))
} else {
val viaBc = xxx(ZRegister.B, ZRegister.C)
if (viaBc.nonEmpty) {
viaBc ++ List(ZLine.ld8(ZRegister.E, ZRegister.C), ZLine.ld8(ZRegister.D, ZRegister.B))
} else {
???
}
}
}
} else Nil
}
target match {
case ZExpressionTarget.NOTHING => hi ++ lo
case ZExpressionTarget.HL => xxx(ZRegister.H, ZRegister.L)
case ZExpressionTarget.DE => xxx(ZRegister.D, ZRegister.E)
case ZExpressionTarget.BC => xxx(ZRegister.B, ZRegister.C)
case ZExpressionTarget.HL => xxx(ZRegister.H, ZRegister.L, allowRedirect = true)
case ZExpressionTarget.DE => xxx(ZRegister.D, ZRegister.E, allowRedirect = true)
case ZExpressionTarget.BC => xxx(ZRegister.B, ZRegister.C, allowRedirect = true)
}
case f@FunctionCallExpression(name, params) =>
name match {