On Tue, 26 May 2026 08:24:22 GMT, Andrey Turbanov <[email protected]> wrote:
>> This PR proposes to swap the pattern-matching switch in `LazyConstant` with >> an if rake to reduce startup time. >> >> The PR also adds a missing `@DontInline` annotation on the slow path. >> >> Performance runs across several platforms suggest a ~20-30% startup >> improvement for noop. >> >> --------- >> - [x] I confirm that I make this contribution in accordance with the >> [OpenJDK Interim AI Policy](https://openjdk.org/legal/ai). > > src/java.base/share/classes/jdk/internal/lang/LazyConstantImpl.java line 96: > >> 94: final Object cf = computingFunctionOrExceptionType; >> 95: // Don't use pattern matching here in order to improve >> startup time. >> 96: if (cf instanceof Supplier<?> computingFunction) { > > But here you do use pattern matching for instanceof... Pattern matching `instanceof` is lowered directly into byte code by javac, it doesn't need bootstrapping like the `switch` variant does. ------------- PR Review Comment: https://git.openjdk.org/jdk/pull/31275#discussion_r3303551334
