Hi, This PR implements addition and subtraction of 128-bit integers in C2. This may have numerous applications:
- It helps intrinsification of operations on 128-bit integers when we have one. - It allows computation that may be incorrect at `long` due to overflow, such as loop predication of long range checks. By implementing this separately, we don't need to worry about finalizing a public API, and we can have a better testing coverage. Testing: - [x] tier1-4,hs-comp-stress Please take a look and leave your review, thanks a lot. --------- - [x] I confirm that I make this contribution in accordance with the [OpenJDK Interim AI Policy](https://openjdk.org/legal/ai). ------------- Commit messages: - whitespace - Implement Int128T addsub Changes: https://git.openjdk.org/jdk/pull/31008/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=31008&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8383724 Stats: 436 lines in 13 files changed: 436 ins; 0 del; 0 mod Patch: https://git.openjdk.org/jdk/pull/31008.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/31008/head:pull/31008 PR: https://git.openjdk.org/jdk/pull/31008
