Typos, better assertions, dead code #37
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More verbose assertions. Unnecessary semicolons removed.
| @@ -787,10 +787,6 @@ object Trees { | |||
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| def flatten[T >: Untyped](trees: List[Tree[T]]): List[Tree[T]] = { | |||
| var buf: ListBuffer[Tree[T]] = null | |||
| def add(tree: Tree[T]) = { | |||
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This is dead code
|
LGTM |
1 similar comment
|
LGTM |
DarkDimius
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Mar 3, 2014
Typos, better assertions, dead code
noti0na1
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to noti0na1/dotty
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Nov 4, 2019
Fix nullification of type arguments
odersky
referenced
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in dotty-staging/dotty
Jun 10, 2022
Some tests by Matt had cases where `.nn` figured prominently in the flamegraph.
I optimized it so that the fast path is streamlined and inlined.
In the following test code:
```
def x: String | Null = "abc"
val y = x.nn
```
the new implementation is
```
10: getstatic #20 // Field MODULE$:LTest$;
13: invokevirtual #24 // Method x:()Ljava/lang/String;
16: astore_0
17: getstatic #29 // Field scala/runtime/Scala3RunTime$.MODULE$:Lscala/runtime/Scala3RunTime$;
20: aload_0
21: invokevirtual #33 // Method scala/runtime/Scala3RunTime$.nn:(Ljava/lang/Object;)Ljava/lang/Object;
24: checkcast #35 // class java/lang/String
27: putstatic #37 // Field y:Ljava/lang/String;
```
The previous implementation was two bytes shorter, but contained in the critical path
- A call to a ScalaRuntime method, which was not inlineable by the JIT compiler due to its size,
- A conversion of a cmparison to a Boolean value (not sure this matters)
- A cast from the return type `Object` to the actual type.
bishabosha
referenced
this pull request
in dotty-staging/dotty
Oct 18, 2022
Some tests by Matt had cases where `.nn` figured prominently in the flamegraph.
I optimized it so that the fast path is streamlined and inlined.
In the following test code:
```
def x: String | Null = "abc"
val y = x.nn
```
the new implementation is
```
10: getstatic #20 // Field MODULE$:LTest$;
13: invokevirtual #24 // Method x:()Ljava/lang/String;
16: astore_0
17: getstatic #29 // Field scala/runtime/Scala3RunTime$.MODULE$:Lscala/runtime/Scala3RunTime$;
20: aload_0
21: invokevirtual #33 // Method scala/runtime/Scala3RunTime$.nn:(Ljava/lang/Object;)Ljava/lang/Object;
24: checkcast #35 // class java/lang/String
27: putstatic #37 // Field y:Ljava/lang/String;
```
The previous implementation was two bytes shorter, but contained in the critical path
- A call to a ScalaRuntime method, which was not inlineable by the JIT compiler due to its size,
- A conversion of a cmparison to a Boolean value (not sure this matters)
- A cast from the return type `Object` to the actual type.
WojciechMazur
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to WojciechMazur/dotty
that referenced
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Mar 19, 2025
Backport "Avoid using the current denotation in NamedType.disambiguate" to 3.3 LTS
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@sjrd @odersky please review