Use `slot & ~0xFF == 0` instead of `(slot & 0xFF) == slot` to reduce codeSize.
The following is a comparison of the bytecode before and after the modification. It can be seen that using `slot & ~0xFF == 0` will reduce one iload operation. // (slot & 0xFF) == slot 56: iload_0 57: sipush 255 60: iand 61: iload_0 62: if_icmpne 71 // slot & ~0xFF == 0 56: iload_0 57: sipush -256 60: iand 61: ifne 70 ------------- Commit messages: - optimize validate slot - optimize validate slot Changes: https://git.openjdk.org/jdk/pull/21367/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21367&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8341581 Stats: 26 lines in 1 file changed: 0 ins; 0 del; 26 mod Patch: https://git.openjdk.org/jdk/pull/21367.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/21367/head:pull/21367 PR: https://git.openjdk.org/jdk/pull/21367
