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Tracking Issue for f16b #160630
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B-experimentalBlocker: In-tree experiment; RFC pending, not yet approved or unneeded (requires FCP to stabilize).Blocker: In-tree experiment; RFC pending, not yet approved or unneeded (requires FCP to stabilize).C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFCF-f16b`#![feature(f16b)]``#![feature(f16b)]`S-tracking-unimplementedStatus: The feature has not been implemented.Status: The feature has not been implemented.T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.T-langRelevant to the language teamRelevant to the language teamT-libsRelevant to the library team, which will review and decide on the PR/issue.Relevant to the library team, which will review and decide on the PR/issue.
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B-experimentalBlocker: In-tree experiment; RFC pending, not yet approved or unneeded (requires FCP to stabilize).Blocker: In-tree experiment; RFC pending, not yet approved or unneeded (requires FCP to stabilize).C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFCF-f16b`#![feature(f16b)]``#![feature(f16b)]`S-tracking-unimplementedStatus: The feature has not been implemented.Status: The feature has not been implemented.T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.T-langRelevant to the language teamRelevant to the language teamT-libsRelevant to the library team, which will review and decide on the PR/issue.Relevant to the library team, which will review and decide on the PR/issue.
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Tracking
This is a tracking issue for the RFC "
bf16type" (rust-lang/rfcs#3983). The feature gate for the issue is#![feature(f16b)].Approved by the language team for experimentation in the 2026/08/06 triage meeting.
This feature is part of the "bf16" project goal from 2026 (pending in rust-lang/goals#723). It was discussed by the language team in the 2026/08/06 design meeting. It is currently being worked on by @Jamesbarford.
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
f16bfrombf16rustfmtUnresolved Questions
f16bcalling convention?Implementation history