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6502: Fix some optimizations

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This commit is contained in:
Karol Stasiak 2018-12-27 20:46:50 +01:00
parent e0cc25c54f
commit 985663083a
2 changed files with 16 additions and 6 deletions
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18
src/main/scala/millfork/assembly/mos/opt/AlwaysGoodOptimizations.scala
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@ -1923,25 +1923,25 @@ object AlwaysGoodOptimizations {
needsFlowInfo = FlowInfoRequirement.JustLabels,
(HasOpcode(LABEL) & MatchParameter(2) & HasCallerCount(1)) ~
(Elidable & HasOpcode(LDA) & MatchAddrMode(0) & MatchParameter(1) & IsNonvolatile) ~
(Linear & Not(ChangesA) & DoesntChangeMemoryAt(0, 1)).* ~
(Linear & Not(ChangesA) & DoesntChangeMemoryAt(0, 1) & DoesntChangeIndexingInAddrMode(0)).* ~
(ShortConditionalBranching & MatchParameter(2)) ~~> { code =>
code(1) :: code(0) :: code.drop(2)
},
(HasOpcode(LABEL) & MatchParameter(2) & HasCallerCount(1)) ~
(Elidable & HasOpcode(LDX) & MatchAddrMode(0) & MatchParameter(1) & IsNonvolatile) ~
(Linear & Not(ChangesX) & DoesntChangeMemoryAt(0, 1)).* ~
(Linear & Not(ChangesX) & DoesntChangeMemoryAt(0, 1) & DoesntChangeIndexingInAddrMode(0)).* ~
(ShortConditionalBranching & MatchParameter(2)) ~~> { code =>
code(1) :: code(0) :: code.drop(2)
},
(HasOpcode(LABEL) & MatchParameter(2) & HasCallerCount(1)) ~
(Elidable & HasOpcode(LDY) & MatchAddrMode(0) & MatchParameter(1) & IsNonvolatile) ~
(Linear & Not(ChangesY) & DoesntChangeMemoryAt(0, 1)).* ~
(Linear & Not(ChangesY) & DoesntChangeMemoryAt(0, 1) & DoesntChangeIndexingInAddrMode(0)).* ~
(ShortConditionalBranching & MatchParameter(2)) ~~> { code =>
code(1) :: code(0) :: code.drop(2)
},
(HasOpcode(LABEL) & MatchParameter(2) & HasCallerCount(1)) ~
(Elidable & HasOpcode(LDZ) & MatchAddrMode(0) & MatchParameter(1)) ~
(Linear & Not(ChangesIZ) & DoesntChangeMemoryAt(0, 1)).* ~
(Linear & Not(ChangesIZ) & DoesntChangeMemoryAt(0, 1) & DoesntChangeIndexingInAddrMode(0)).* ~
(ShortConditionalBranching & MatchParameter(2)) ~~> { code =>
code(1) :: code(0) :: code.drop(2)
},
@ -2659,5 +2659,15 @@ object AlwaysGoodOptimizations {
code(3).copy(opcode = BCC))
},
(Elidable & HasOpcode(TXA)) ~
(Elidable & HasOpcode(CMP) & DoesntMatterWhatItDoesWith(State.A) & HasAddrModeIn(Absolute, ZeroPage, Immediate)) ~~> { code =>
List(code.last.copy(opcode = CPX))
},
(Elidable & HasOpcode(TYA)) ~
(Elidable & HasOpcode(CMP) & DoesntMatterWhatItDoesWith(State.A) & HasAddrModeIn(Absolute, ZeroPage, Immediate)) ~~> { code =>
List(code.last.copy(opcode = CPY))
},
)
}

4
src/main/scala/millfork/assembly/mos/opt/VariableToRegisterOptimization.scala
View File

@ -52,7 +52,7 @@ object VariableToRegisterOptimization extends AssemblyOptimization[AssemblyLine]
private val opcodesThatAlwaysPrecludeXAllocation = Set(
JSR, STX, TXA, INX, DEX, CPX,
LDX_W, STX_W, CPX_W, DEX_W, INX_W,
PHX, PLX,
PHX, PLX, PHX_W, PLX_W,
SBX, SAX, LXA, XAA, AHX, SHX, SHY, LAS, TAS,
HuSAX, SXY, TXY, TXY,
BYTE,
@ -61,7 +61,7 @@ object VariableToRegisterOptimization extends AssemblyOptimization[AssemblyLine]
private val opcodesThatAlwaysPrecludeYAllocation = Set(
JSR, STY, TYA, INY, DEY, CPY,
LDY_W, STY_W, CPY_W, DEY_W, INY_W,
PHY, PLY,
PHY, PLY, PHY_W, PLY_W,
AHX, SHX, SHY, LAS, TAS,
SAY, SXY, TXY, TYX,
BYTE,