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Fix TCO

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This commit is contained in:
Karol Stasiak 2019-08-04 13:40:49 +02:00
parent dfda9f9283
commit 1a87929ad3
3 changed files with 4 additions and 2 deletions
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2
CHANGELOG.md
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@ -41,6 +41,8 @@ This matches both the CC65 behaviour and the return values from `readkey()`.
* Fixed many optimization bugs:
* incorrect removal of unused local variables;
* broken parameter passing to tail calls;
* 6502: miscompilation when using the zeropage pseudoregister;

2
src/main/scala/millfork/assembly/mos/opt/AlwaysGoodOptimizations.scala
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@ -825,7 +825,7 @@ object AlwaysGoodOptimizations {
(Elidable & HasOpcode(JSR)) ~
HasOpcode(LABEL).* ~
NoopDiscardsFlags.*.capture(0) ~
HasOpcode(RTS) ~~> ((code, ctx) => ctx.get[List[AssemblyLine]](0) ++ (code.head.copy(opcode = JMP) :: code.tail)),
HasOpcode(RTS) ~~> ((code, ctx) => code.head.copy(opcode = JMP) :: code.tail),
)
val UnusedCodeRemoval = new RuleBasedAssemblyOptimization("Unreachable code removal",

2
src/main/scala/millfork/assembly/z80/opt/LaterI80Optimizations.scala
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@ -138,7 +138,7 @@ object LaterI80Optimizations {
HasOpcode(LABEL).* ~
(Elidable & HasOpcodeIn(ZOpcodeClasses.NoopDiscards)).*.capture(0) ~
(Elidable & HasOpcode(RET) & HasRegisters(NoRegisters)) ~~> { (code, ctx) =>
ctx.get[List[ZLine]](0) ++ (code.head.copy(opcode = JP) :: code.tail)
code.head.copy(opcode = JP) :: code.tail
},
)