[Bug 221733] SSE2 instructions emited in compiler-rt on AMD Sempron 3000+

bugzilla-noreply at freebsd.org bugzilla-noreply at freebsd.org
Wed Aug 23 08:03:28 UTC 2017


https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221733

Konstantin Belousov <kib at FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |kib at FreeBSD.org

--- Comment #1 from Konstantin Belousov <kib at FreeBSD.org> ---
i386 system libraries must not access %xmm registers at all.  At least not
without checking for CPUID support first, and then checking for SSE and SSE2
features as needed.

lib32 libraries built on amd64 host are somewhat different.  We compile them
with ppro arch set, which at least allows cmovX instructions, and this
environment also can assume that SSE2 is present, since amd64 requires CPU with
SSE2 (there is no long-mode capable CPU not supporting SSE2).

For i386, this is definitely bug.

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