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6502: Optimize constant comparisons

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This commit is contained in:
Karol Stasiak 2018-10-12 00:13:49 +02:00
parent ab267c88ac
commit bdd41350a7
1 changed files with 8 additions and 8 deletions
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16
src/main/scala/millfork/assembly/mos/opt/FlowAnalyzerForImmediate.scala
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@ -211,8 +211,8 @@ object FlowAnalyzerForImmediate {
},
CMP -> {(nn, currentStatus) =>
currentStatus.copy(
c = if (nn == 0) Status.SingleTrue else AnyStatus,
n = AnyStatus,
c = if (nn == 0) Status.SingleTrue else currentStatus.a.map(v => (v & 0xff) >= (nn & 0xff)),
n = currentStatus.a.map(v => v.-(nn).&(0x80).!=(0)),
z = currentStatus.a.map(v => (v & 0xff) == (nn & 0xff)) |
currentStatus.a0.flatMap(v => if (v) {
if ((nn & 1) == 0) Status.SingleFalse
@ -232,22 +232,22 @@ object FlowAnalyzerForImmediate {
},
CPX -> { (nn, currentStatus) =>
currentStatus.copy(
c = if (nn == 0) Status.SingleTrue else AnyStatus,
n = AnyStatus,
c = if (nn == 0) Status.SingleTrue else currentStatus.x.map(v => (v & 0xff) >= (nn & 0xff)),
n = currentStatus.x.map(v => v.-(nn).&(0x80).!=(0)),
z = currentStatus.x.map(v => (v & 0xff) == (nn & 0xff)),
src = if (nn == 0) SourceOfNZ.X else AnyStatus)
},
CPY -> {(nn, currentStatus) =>
currentStatus.copy(
c = if (nn == 0) Status.SingleTrue else AnyStatus,
n = AnyStatus,
c = if (nn == 0) Status.SingleTrue else currentStatus.y.map(v => (v & 0xff) >= (nn & 0xff)),
n = currentStatus.y.map(v => v.-(nn).&(0x80).!=(0)),
z = currentStatus.y.map(v => (v & 0xff) == (nn & 0xff)),
src = if (nn == 0) SourceOfNZ.Y else AnyStatus)
},
CPZ -> {(nn, currentStatus) =>
currentStatus.copy(
c = if (nn == 0) Status.SingleTrue else AnyStatus,
n = AnyStatus,
c = if (nn == 0) Status.SingleTrue else currentStatus.iz.map(v => (v & 0xff) >= (nn & 0xff)),
n = currentStatus.iz.map(v => v.-(nn).&(0x80).!=(0)),
z = currentStatus.iz.map(v => (v & 0xff) == (nn & 0xff)),
src = if (nn == 0) SourceOfNZ.Z else AnyStatus)
},