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i486 targets #70

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i486 targets#70
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enhancementNew feature or request

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@seritools
seritools
opened on Aug 15, 2026

Set target cpu to i486, reduce max_atomic_width to 32.

There are two places that unconditionally use 64bit atomics in windows code:

  • futex.rs: Can just make conditional on #[cfg(target_has_atomic = "64")]
  • time.rs: can store the FREQUENCY value in a regular static mut global, and use an AtomicBool to indicate whether it's fully set already

Limits crates to those without AtomicU64/AtomicI64 usage.

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  1. seritools
    added
    enhancementNew feature or request
    on Aug 15, 2026
  2. seritools
    changed the title [-]i386 targets[/-] [+]i486 targets[/+] on Aug 16, 2026

  3. seritools commented on Aug 16, 2026

    @seritools
    seritools
    on Aug 16, 2026
    MemberAuthor

    update: i386 isn't likely to happen: cmpxchg is 486+ and libatomic-ish emulation is too much 😅

    Even beyond atomics, LLVM doesn't support i386 well: llvm/llvm-project#58470

    Let's try with i486 then!

  4. seritools commented on Aug 18, 2026

    @seritools
    seritools
    on Aug 18, 2026
    MemberAuthor
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  5. seritools
    closed this as completedon Aug 18, 2026

  6. seritools commented on Aug 18, 2026

    @seritools
    seritools
    on Aug 18, 2026
    MemberAuthor

    released in https://github.com/rust9x/rust/releases/tag/rust9x-1.98-beta-v5

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