Tracking Issue for lahfsahf_target_feature

This is a tracking issue for lahfsahf_target_feature, the lahfsahf target feature on x86.

See https://github.com/rust-lang/rust/issues/44839 for discussion from before this feature got its own tracking issue.

About tracking issues

Tracking issues are used to record the overall progress of implementation.
They are also used as hubs connecting to other relevant issues, e.g., bugs or open design questions.
A tracking issue is however not meant for large scale discussion, questions, or bug reports about a feature.
Instead, open a dedicated issue for the specific matter and add the relevant feature gate label.
Discussion comments will get marked as off-topic or deleted.
Repeated discussions on the tracking issue may lead to the tracking issue getting locked.

Steps

• Figure out ABI interactions and other possible blockers/concerns
• Final Comment Period (FCP)
• Stabilization PR (see instructions on rustc-dev-guide)

Unresolved Questions

none at the moment

Implementation history

Start with the tracking issue checklist and the discussion in rust-lang/rust#44839. Read the stabilization guide linked from the issue, then investigate the ABI interactions and blockers for the x86 lahfsahf target feature. Done means those concerns are resolved and the FCP and stabilization PR steps can proceed.