scalac_perf

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List should use eq Nil instead of isEmpty for end of list detection

11

``` @inline final override def foreach[U](f: A => U) { var these = this while (!these.isEmpty) { f(these.head) these = these.tail } } ``` could be ``` @inline final override...

mkeskells

move thread start/stop to ThreadFactory avoid race on shutdown profile a hook for lock contention in profiler add reporting of lock stats in profiler

mkeskells

If a Vector is compared to another Vector (or some other collection that efficiently implements length and apply) then we should prefer that mechanism, with a default/fallback to the existing...

mkeskells

StringOps * could be improved by shortcutting on n=0 or 1

3

If n=0 or 1 no need to create builders etc

RobinStephenson

StringInterpolation is slow and inefficient

6

String Interpolation is slow at run time and inefficient code generation, with lots of temporary garbage generated convert s and raw to macros (like f is already) generate optimal code...

mkeskells

classpath scanning and caching is slow

1

improve some work started on this in 2.12.x_classpath_2

mkeskells

mkeskells

move validation of typer to separate phase

1

move the non typechecking things after typer e.g. rangepos validation lint etc opportunities for parallelization

mkeskells

-Yrangepos - parallelize

1

rangepos is read only, and doesn't cause typing - its a check of the relative positions in the tree it seems to be a good candidate to be moved into...

mkeskells

package object math

3

this contains scala aliases for java.lang.Math primitives e.g. ``` /** @group minmax */ def min(x: Int, y: Int): Int = java.lang.Math.min(x, y) /** @group minmax */ def min(x: Long, y:...

mkeskells