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Tracking Issue for exposing float mask constants #154064

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Tracking Issue for exposing float mask constants#154064
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C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCT-libsRelevant to the library team, which will review and decide on the PR/issue.

Description

@Apersoma
Apersoma
opened on Mar 19, 2026

Feature gate: #![feature(float_masks)]

This is a tracking issue for exposing constants for masking parts of floating point numbers.

Public API

pub const SIGN_MASK: u32 = 0x8000_0000;

pub const EXPONENT_MASK: u32 = 0x7f80_0000;

pub const MANTISSA_MASK: u32 = 0x007f_ffff;

Steps / History

(Remember to update the S-tracking-* label when checking boxes.)

Unresolved Questions

  • None at this time/

Footnotes

  1. https://std-dev-guide.rust-lang.org/feature-lifecycle/stabilization.html ↩

Activity

  1. Apersoma
    added
    T-libs-api[DEPRECATED; DO NOT USE]
    C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFC
    S-tracking-unimplementedStatus: The feature has not been implemented.
    on Mar 19, 2026

  2. Apersoma commented on Apr 24, 2026

    @Apersoma
    Apersoma
    on Apr 24, 2026
    ContributorAuthor

    @rustbot label: -S-tracking-unimplemented +S-tracking-impl-incomplete

  3. rustbot
    added
    S-tracking-impl-incompleteStatus: The implementation is incomplete.
    and removed
    S-tracking-unimplementedStatus: The feature has not been implemented.
    on Apr 24, 2026

  4. Apersoma commented on Apr 24, 2026

    @Apersoma
    Apersoma
    on Apr 24, 2026
    ContributorAuthor

    @rustbot label: -S-tracking-impl-incomplete
    realized that was the wrong label. not sure what the right one is

  5. rustbot
    removed
    S-tracking-impl-incompleteStatus: The implementation is incomplete.
    on Apr 24, 2026
  6. jhpratt
    added 2 commits that reference this issue on Apr 25, 2026

    Rollup merge of rust-lang#154372 - Apersoma:float_masks, r=tgross35

    e9d170c

    Rollup merge of rust-lang#154372 - Apersoma:float_masks, r=tgross35

    b3ccc96
  7. rust-timer
    added a commit that references this issue on Apr 25, 2026

    Unrolled build for #154372

    863518e
  8. jannic
    added a commit that references this issue on May 30, 2026

    Fix future incompatibility warning regarding float bit masks

    dd7d929
  9. clarfonthey
    added
    T-libsRelevant to the library team, which will review and decide on the PR/issue.
    and removed
    T-libs-api[DEPRECATED; DO NOT USE]
    on Aug 12, 2026
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