[Bug 213008] [clang] Bad machine code: Using an undefined physical register

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=213008

            Bug ID: 213008
           Summary: [clang] Bad machine code: Using an undefined physical
                    register
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: thierry at FreeBSD.org

The port cad/gmsh-occ failed on the packages cluster with the following
message:

*** Bad machine code: Using an undefined physical register ***
- function:    _ZN11voroMetal3D14correspondanceEddddiRbddd
- basic block: BB#22 land.lhs.true34 (0x2ee848bc)
- instruction: FNSTSW16r
- operand 1:   %FPSW<imp-use,kill>
fatal error: error in backend: Found 1 machine code errors.
c++: error: clang frontend command failed with exit code 70 (use -v to see
invocation)
FreeBSD clang version 3.8.0 (tags/RELEASE_380/final 262564) (based on LLVM
3.8.0)
Target: i386-unknown-freebsd12.0
Thread model: posix
InstalledDir: /usr/bin
c++: note: diagnostic msg: PLEASE submit a bug report to
https://bugs.freebsd.org/submit/ and include the crash backtrace, preprocessed
source, and associated run script.
c++: note: diagnostic msg: 

Full log is available at
http://beefy3.nyi.freebsd.org/data/head-i386-default/p422738_s306306/logs/gmsh-occ-2.12.0_1.log

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