[Bug 197396] clang failure building kernel sys/dev/hptmv

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=197396

            Bug ID: 197396
           Summary: clang failure building kernel sys/dev/hptmv
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: sbruno at FreeBSD.org
                CC: dim at FreeBSD.org

Cannot emit physreg copy instruction
UNREACHABLE executed at
/usr/src/lib/clang/libllvmx86codegen/../../../contrib/llvm/lib/Target/X86/X86InstrInfo.cpp:3176!
Stack dump:
0.      Program arguments: /usr/obj/usr/src/tmp/usr/bin/cc -cc1 -triple
x86_64-unknown-freebsd11.0 -emit-obj -mrelax-all -disable-free -main-file-name
hptproc.c -mrelocation-model static -mdisable-fp-elim -masm-verbose
-mconstructor-aliases -mcode-model kernel -target-cpu x86-64 -target-feature
-mmx -target-feature -sse -target-feature -aes -target-feature -avx
-disable-red-zone -no-implicit-float -gdwarf-2 -dwarf-column-info
-coverage-file
/usr/obj/usr/src/sys/TASTY/modules/usr/src/sys/modules/hptmv/hptproc.o
-nostdsysteminc -nobuiltininc -resource-dir
/usr/obj/usr/src/tmp/usr/bin/../lib/clang/3.5.1 -include
/usr/obj/usr/src/sys/TASTY/opt_global.h -D _KERNEL -D KLD_MODULE -D
HAVE_KERNEL_OPTION_HEADERS -I . -I /usr/src/sys -I /usr/src/sys/contrib/altq -I
/usr/obj/usr/src/sys/TASTY -isysroot /usr/obj/usr/src/tmp -Werror
-Wno-error-tautological-compare -Wno-error-empty-body
-Wno-error-parentheses-equality -Wno-error-unused-function
-Wno-error-pointer-sign -Wall -Wredundant-decls -Wnested-externs
-Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual
-Wundef -Wno-pointer-sign -Wmissing-include-dirs -Wno-unknown-pragmas
-Wno-error-tautological-compare -Wno-error-empty-body
-Wno-error-parentheses-equality -Wno-error-unused-function
-Wno-error-pointer-sign -std=iso9899:1999 -fdebug-compilation-dir
/usr/obj/usr/src/sys/TASTY/modules/usr/src/sys/modules/hptmv -ferror-limit 19
-fmessage-length 0 -ffreestanding -fformat-extensions -fwrapv -stack-protector
1 -mstackrealign -fobjc-runtime=gnustep -fno-common -fdiagnostics-show-option
-o hptproc.o -x c /usr/src/sys/modules/hptmv/../../dev/hptmv/hptproc.c 
1.      <eof> parser at end of file
2.      Code generation
3.      Running pass 'Function Pass Manager' on module
'/usr/src/sys/modules/hptmv/../../dev/hptmv/hptproc.c'.
4.      Running pass 'Post-RA pseudo instruction expansion pass' on function
'@hpt_proc_in'
cc: error: unable to execute command: Abort trap (core dumped)
cc: error: clang frontend command failed due to signal (use -v to see
invocation)
FreeBSD clang version 3.5.1 (tags/RELEASE_351/final 225668) 20150115
Target: x86_64-unknown-freebsd11.0
Thread model: posix
cc: 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.
cc: note: diagnostic msg: 
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
cc: note: diagnostic msg: /tmp/hptproc-c873ed.c
cc: note: diagnostic msg: /tmp/hptproc-c873ed.sh
cc: note: diagnostic msg: 

********************
--- hptproc.o ---
*** [hptproc.o] Error code 254

make[4]: stopped in /usr/src/sys/modules/hptmv
1 error

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