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Subject: [Bug 218387] -march=native or any specific CPU with clang seems to
 produce a lot of x87 instructions
Date: Wed, 05 Apr 2017 06:24:50 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D218387

Rodney W. Grimes <rgrimes@FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rgrimes@FreeBSD.org

--- Comment #3 from Rodney W. Grimes <rgrimes@FreeBSD.org> ---
Attempting to confirm.

Using FreeBSD 11.0-STABLE #0 r316340 system.
Built src/lib/msun with /etc/make.conf containing CPUTYPE=3Dsandybridge

clang -v
FreeBSD clang version 3.8.0 (tags/RELEASE_380/final 262564) (based on LLVM
3.8.0)

objdump -dSRC libm.so.5 indicates lots of legacy fpu instructions like
fmuls instead of mulss as well as usage of the %st() registers

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