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   Andy Smith (pre-Grinch mode) (grifferz@social.bitfolk.com)'s status on Sunday, 24-Nov-2024 02:17:30 JST Andy Smith (pre-Grinch mode)

   TIL that LLVM (and thus Rust) is not safe on 32-bit x86 due to some weirdness with floating point that does not even require floating point arithmetic to trigger, just the use of any floating point at all.

   Clearly dividing God's integers into fractional parts was a heresy.

   https://github.com/rust-lang/rust/issues/114479#issuecomment-2072052116

   #rustlang

   • Embed this notice
     Anthk (anthk@paquita.masto.host)'s status on Sunday, 24-Nov-2024 02:18:14 JST Anthk

     in reply to

     @grifferz hyperbola did the right thing throwing away Rust.

   • Embed this notice
     Andy Smith (pre-Grinch mode) (grifferz@social.bitfolk.com)'s status on Sunday, 24-Nov-2024 02:18:15 JST Andy Smith (pre-Grinch mode)

     in reply to

     Leading to this proposal last week to require SSE2 instructions for 32-bit x86 Rust.

     If that passes, Debian would not be able to package Rust on 32-bit x86, though the next stable release of Debian won't have a 32-bit kernel so arguably it would be no loss to say "all Rust is 64-bit on x86 from now."

     https://github.com/rust-lang/compiler-team/issues/808

     #rustlang #debian

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     Andy Smith (pre-Grinch mode) (grifferz@social.bitfolk.com)'s status on Sunday, 24-Nov-2024 02:18:16 JST Andy Smith (pre-Grinch mode)

     in reply to

     This is not theoretical: e.g. Debian's 32-bit x86 baseline is i686-without-SSE2 but this will include the problematic instructions so to fix this would require the baseline for the whole operating system to change or else to special-case rust to target i586.

     Arguably this because Debian is not enabling SSE2 on i686 but that is just to allow more hardware to work.

     https://lists.debian.org/msgid-search/d8b5003f-8543-47b3-84a5-ade34c831655@app.fastmail.com

     #Debian