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6502: another optimization for comparisons

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This commit is contained in:
Karol Stasiak 2018-12-19 18:14:40 +01:00
parent 1e9be50ccb
commit 30d18fba01
1 changed files with 13 additions and 1 deletions
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14
src/main/scala/millfork/assembly/mos/opt/AlwaysGoodOptimizations.scala
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@ -2646,6 +2646,18 @@ object AlwaysGoodOptimizations {
code(1).copy(opcode = LDA),
code(0).copy(opcode = CMP),
code(2).copy(opcode = BCS))
}
},
(Elidable & HasOpcode(LDA)) ~
(Elidable & HasOpcode(CMP) & DoesntMatterWhatItDoesWith(State.A, State.N)) ~
(Elidable & HasOpcode(BEQ) & MatchParameter(2)) ~
(Elidable & HasOpcode(BCS) & DoesntMatterWhatItDoesWith(State.C) & MatchParameter(1)) ~
(Elidable & HasCallerCount(1) & MatchParameter(2)) ~~> { code =>
List(
code(1).copy(opcode = LDA),
code(0).copy(opcode = CMP),
code(3).copy(opcode = BCC))
},
)
}