[DAG] Allow MIN/MAX signedness flip when operands are known-negative (#174469)
Extend the existing DAGCombine logic in visitIMINMAX so that signed and
unsigned MIN/MAX can be flipped not only when both operands are known
non-negative but also when both operands are known negative. This
replaces the old SignBitIsZero checks with computeKnownBits and explicit
tests for non-negative or negative operands while keeping all existing
legality and saturation gating in place. Add regression tests to cover
both the known-negative case and the known-non-negative case.
Fixes #174325
InstCombine: Improve single-use fneg(fabs(x)) SimplifyDemandedFPClass handling
Match the multi-use case's logic for understanding no-nan/no-inf context.
Also only apply the nsz handling in the single use case. alive2 seems to treat
nsz as nondeterministic for each use.
[docs] Add human-in-the-loop policy for tool-assisted contributions (#154441)
Over the course of 2025, we observed an increase in the volume of
LLM-assisted nuisance contributions to the project. Nuisance
contributions have always been an issue for open-source projects, but
until LLMs, we made do without a formal policy banning such
contributions. However, LLMs are here, so we are adopting this policy,
abbreviated as "human in the loop", which requires that every
contribution has a human author attesting to the value of that
contribution, and that it is high enough quality that it is worth the
time it takes to review the contribution.
This policy evolved over time based on community input from the
following Discourse threads and a few area team and LLVM project council
meetings:
* [Our AI policy vs code of conduct and vs
reality](https://discourse.llvm.org/t/our-ai-policy-vs-code-of-conduct-and-vs-reality/88300)
* [[RFC] LLVM AI tool policy: start small, no slop](https://discourse.llvm.org/t/rfc-llvm-ai-tool-policy-start-small-no-slop/88476)
* [[RFC] LLVM AI tool policy: human in the
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ng_netflow v9: fix template re-announcement using packet count
Increment fe->sent_packets after export9_send().
Previously, NetFlow v9 templates were only re-announced based on
time, ignoring the packet count parameter (`templ_packets`).
PR: 270083
Reviewed by: glebius pouria
Approved by: glebius (mentor)
MFC after: 1 week
Sponsored by: Subcarpathian BSD User Group
InstCombine: Fix duplicated code in SimplifyDemandedFPClass fabs handling (#176442)
2b03d68398819fe3608c680d6c25aa9d5a043c03 factored this into a function
and used from the new place, but forgot to delete the old code from
the original location.
NAS-139207 / 25.10.2 / Robustize iSCSI ALUA (#17995)
- For HA systems, do not use systemd to start SCST.
- Improve DLM cleanup.
- Improve ALUA handling with locked or disabled extents.
- Add additional lun health checks to standby_after_start.
- Eliminate customization of recovery_tmo on HA sessions.
- Optimize removal of ALUA HA LUN in removed_target_extent.
(cherry picked from commit d963e7ac7aeb1b2c688365cb54350971ec1d1751)
