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Subject: [Bug 223415] lang/rust: don't require SSE2 on i386 (at least for
 binary packages)
Date: Mon, 11 Dec 2017 05:04:37 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D223415

--- Comment #13 from Jan Beich <jbeich@FreeBSD.org> ---
(In reply to Bertrand Petit from comment #12)
> $ objdump -d usr/local/bin/rg | grep xmm
[...]

WITH_DEBUG=3D1 port build contains symbol names. It seems xmm registers are=
 used
by __floatdidf and __floatundidf from compiler-rt. Rust compiler always
includes optimized routines on i386 but not always uses them. If my
understanding is correct then the code is dead.

# Rust 1.22.1
https://github.com/rust-lang-nursery/compiler-builtins/blob/0b9844764ea1/bu=
ild.rs#L3977
https://github.com/rust-lang-nursery/compiler-builtins/blob/0b9844764ea1/sr=
c/float/conv.rs#L91
https://github.com/rust-lang-nursery/compiler-builtins/blob/0b9844764ea1/sr=
c/float/conv.rs#L120
https://github.com/rust-lang/compiler-rt/blob/c8a8767c56ad/lib/builtins/i38=
6/floatdidf.S
https://github.com/rust-lang/compiler-rt/blob/c8a8767c56ad/lib/builtins/i38=
6/floatundidf.S

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