RFR: 8324121: SIGFPE in PhaseIdealLoop::extract_long_range_checks [v2]

[Dean Long]

On Tue, 26 Mar 2024 08:22:03 GMT, Roland Westrelin <roland at openjdk.org> wrote:

>> Unfortunately, there is still an overflow here when `scale` is min_jlong.
>
> Right but isn't it harmless in this particular case?

No, if it's undefined behavior, we can't be sure what result the C++ compiler will give.  And if we test with -ftrapv it will crash.

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PR Review Comment: https://git.openjdk.org/jdk/pull/18397#discussion_r1539717622