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Faster +=1 for large variables

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This commit is contained in:
Karol Stasiak 2017-12-18 17:51:48 +01:00
parent 081e3bc55c
commit 1dd8c3d855
2 changed files with 74 additions and 0 deletions
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34
src/main/scala/millfork/compiler/BuiltIns.scala
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@ -618,7 +618,41 @@ object BuiltIns {
def isRhsStack(xs: List[AssemblyLine]): Boolean = xs.exists(_.opcode == TSX)
val canUseIncDec = !decimal && targetBytes.forall(_.forall(l => l.opcode != STA || (l.addrMode match {
case AddrMode.Absolute => true
case AddrMode.AbsoluteX => true
case AddrMode.ZeroPage => true
case AddrMode.ZeroPageX => true
case _ => false
})))
def doDec(lines: List[List[AssemblyLine]]):List[AssemblyLine] = lines match {
case Nil => Nil
case x :: Nil => staTo(DEC, x)
case x :: xs =>
val label = MlCompiler.nextLabel("de")
staTo(LDA, x) ++
List(AssemblyLine.relative(BNE, label)) ++
doDec(xs) ++
List(AssemblyLine.label(label)) ++
staTo(DEC, x)
}
val (calculateRhs, addendByteRead0): (List[AssemblyLine], List[List[AssemblyLine]]) = env.eval(addend) match {
case Some(NumericConstant(0, _)) =>
return Nil
case Some(NumericConstant(1, _)) if canUseIncDec && !subtract =>
val label = MlCompiler.nextLabel("in")
return staTo(INC, targetBytes.head) ++ targetBytes.tail.flatMap(l => AssemblyLine.relative(BNE, label)::staTo(INC, l)) :+ AssemblyLine.label(label)
case Some(NumericConstant(-1, _)) if canUseIncDec && subtract =>
val label = MlCompiler.nextLabel("in")
return staTo(INC, targetBytes.head) ++ targetBytes.tail.flatMap(l => AssemblyLine.relative(BNE, label)::staTo(INC, l)) :+ AssemblyLine.label(label)
case Some(NumericConstant(1, _)) if canUseIncDec && subtract =>
val label = MlCompiler.nextLabel("de")
return doDec(targetBytes)
case Some(NumericConstant(-1, _)) if canUseIncDec && !subtract =>
val label = MlCompiler.nextLabel("de")
return doDec(targetBytes)
case Some(constant) =>
addendSize = targetSize
Nil -> List.tabulate(targetSize)(i => List(AssemblyLine.immediate(LDA, constant.subbyte(i))))

40
src/test/scala/millfork/test/LongTest.scala
View File

@ -157,4 +157,44 @@ class LongTest extends FunSuite with Matchers {
m.readLong(0xc000) should equal(0x44)
}
}
test("Long INC/DEC") {
EmuBenchmarkRun(
"""
| long output0 @$c000
| long output1 @$c004
| long output2 @$c008
| long output3 @$c00c
| long output4 @$c010
| long output5 @$c014
| long output6 @$c018
| void main () {
| output0 = 0
| output1 = $FF
| output2 = $FFFF
| output3 = $FF00
| output4 = $FF00
| output5 = $10000
| output6 = 0
| barrier()
| output0 += 1
| output1 += 1
| output2 += 1
| output3 += 1
| output4 -= 1
| output5 -= 1
| output6 -= 1
| }
| void barrier() {
| }
""".stripMargin) { m =>
m.readLong(0xc000) should equal(1)
m.readLong(0xc004) should equal(0x100)
m.readLong(0xc008) should equal(0x10000)
m.readLong(0xc00c) should equal(0xff01)
m.readLong(0xc010) should equal(0xfeff)
m.readLong(0xc014) should equal(0xffff)
m.readLong(0xc018) should equal(0xffffffff)
}
}
}