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6502: more possible comparisons for 16-bit words

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This commit is contained in:
Karol Stasiak 2019-07-19 15:48:08 +02:00
parent ed6d96f3f5
commit 45c137e2c0
1 changed files with 53 additions and 3 deletions
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56
src/main/scala/millfork/compiler/mos/BuiltIns.scala
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@ -704,9 +704,59 @@ object BuiltIns {
AssemblyLine.immediate(CPX, constant.hiByte),
AssemblyLine.relative(BNE, Label(x)))
case _ =>
// TODO comparing expressions
ctx.log.error("Too complex expressions in comparison", lhs.position.orElse(rhs.position))
(Nil, Nil, Nil, Nil, Nil)
val lc = MosExpressionCompiler.compileToAX(ctx, lhs)
val rc = MosExpressionCompiler.compileToAX(ctx, rhs)
(lc, rc, effectiveComparisonType) match {
case (
List(lcl@AssemblyLine0(LDA, Absolute | Immediate | ZeroPage | LongAbsolute, _), lch@AssemblyLine0(LDX, Absolute | Immediate | ZeroPage, _)),
_,
ComparisonType.NotEqual
) =>
return rc ++ List(
lcl.copy(opcode = CMP),
AssemblyLine.relative(BNE, Label(x)),
lch.copy(opcode = CPX),
AssemblyLine.relative(BNE, Label(x)))
case (
_,
List(rcl@AssemblyLine0(LDA, Absolute | Immediate | ZeroPage | LongAbsolute, _), rch@AssemblyLine0(LDX, Absolute | Immediate | ZeroPage, _)),
ComparisonType.NotEqual
) =>
return lc ++ List(
rcl.copy(opcode = CMP),
AssemblyLine.relative(BNE, Label(x)),
rch.copy(opcode = CPX),
AssemblyLine.relative(BNE, Label(x)))
case (
List(lcl@AssemblyLine0(LDA, Absolute | Immediate | ZeroPage | LongAbsolute, _), lch@AssemblyLine0(LDX, Absolute | Immediate | ZeroPage, _)),
_,
ComparisonType.Equal
) =>
val skip = ctx.nextLabel("cp")
return rc ++ List(
lcl.copy(opcode = CMP),
AssemblyLine.relative(BNE, skip),
lch.copy(opcode = CPX),
AssemblyLine.relative(BEQ, Label(x)),
AssemblyLine.label(skip))
case (
_,
List(rcl@AssemblyLine0(LDA, Absolute | Immediate | ZeroPage | LongAbsolute, _), rch@AssemblyLine0(LDX, Absolute | Immediate | ZeroPage, _)),
ComparisonType.Equal
) =>
val skip = ctx.nextLabel("cp")
return lc ++ List(
rcl.copy(opcode = CMP),
AssemblyLine.relative(BNE, Label(skip)),
rch.copy(opcode = CPX),
AssemblyLine.relative(BEQ, Label(x)),
AssemblyLine.label(skip))
case _ =>
// TODO comparing expressions
ctx.log.error("Too complex expressions in comparison", lhs.position.orElse(rhs.position))
(Nil, Nil, Nil, Nil, Nil)
}
}
val lType = MosExpressionCompiler.getExpressionType(ctx, lhs)
val rType = MosExpressionCompiler.getExpressionType(ctx, rhs)