[llvm-bugs] [Bug 41026] New: AVX-512dq: fatal error : error in backend: unknown codeview register

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=41026

            Bug ID: 41026
           Summary: AVX-512dq: fatal error : error in backend: unknown
                    codeview register
           Product: clang
           Version: 7.0
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: angus.hewlett at roli.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org,
                    neeilans at live.com, richard-llvm at metafoo.co.uk

Created attachment 21580
  --> https://bugs.llvm.org/attachment.cgi?id=21580&action=edit
shell file for clang-cl execution

Note: possible duplicate of 38482 - unable to confirm at this time, as I'm
still on v7.0.1 (clang-cl Windows x64 prebuilt).

********************************************
Summary: 

Bug description: AVX512dq clang-cl crash during compilation
CL : fatal error : error in backend: unknown codeview register
clang frontend command failed with exit code 70
Compiling AVX512 code using clang-cl.

Command line options:
/MP /GS- /W3 /Gy /Zc:wchar_t /Zi /Gm- /Ox /Ob2 /Zc:inline /fp:fast  /fp:except-
/errorReport:prompt /GF- /WX- /Zc:forScope /GR /Gd /Oy- /Oi /MT /std:c++17 /FC
/EHa /nologo /Ot  /diagnostics:classic -mavx512dq

(Side-note: non-AVX512 versions of code following the same pattern compile fine
- SSE2, SSE4.1, AVX, AVX2-FMA are all OK).


*********************************************

Full error report:



1>CL : fatal error : error in backend: unknown codeview register
1>clang-cl.exe : error : clang frontend command failed with exit code 70 (use
-v to see invocation)
1>clang version 7.0.1 (tags/RELEASE_701/final)
1>Target: x86_64-pc-windows-msvc
1>Thread model: posix
1>InstalledDir: C:\Program Files\LLVM\bin
1>clang-cl.exe: note: diagnostic msg: PLEASE submit a bug report to
https://bugs.llvm.org/ and include the crash backtrace, preprocessed source,
and associated run script.
1>clang-cl.exe: note: diagnostic msg:
1>********************
1>
1>PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
1>Preprocessed source(s) and associated run script(s) are located at:
1>clang-cl.exe: note: diagnostic msg:
C:\Users\Angus\AppData\Local\Temp\DispatchAVX512-f040c6.cpp
1>clang-cl.exe: note: diagnostic msg:
C:\Users\Angus\AppData\Local\Temp\DispatchAVX512-f040c6.sh
1>clang-cl.exe: note: diagnostic msg:
1>
1>********************

Shell file attached - cannot attach the preprocessed *.cpp file due to its
size. Please contact me if you'd like to inspect the preprocessed .cpp (about
2MB compressed, 18MB uncompressed).

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