[llvm-bugs] [Bug 48197] New: clang-10 fails to compile C-embedded assembly with SSE and AVX instructions

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48197

            Bug ID: 48197
           Summary: clang-10 fails to compile C-embedded assembly with SSE
                    and AVX instructions
           Product: clang
           Version: 10.0
          Hardware: PC
                OS: FreeBSD
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C
          Assignee: unassignedclangbugs at nondot.org
          Reporter: yuri at tsoft.com
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

The attached testcases test_sse.cpp and test_avx.cpp fail on FreeBSD 12.2 with
clang-10:

> [yuri at yv /tmp/llvm-asm-failure]$ c++ -O2 -fPIC -o test_sse.gcc.o -msse -c test_sse.cpp
> test_sse.cpp:9:39: error: expected relocatable expression
>         "movups 0x00 + %[xs], %%xmm0\n\t"
>                                       ^
> <inline asm>:2:2: note: instantiated into assembly here
>         movups %xmm0, 0x00 + (%rax)
>         ^
> 1 error generated.
> [yuri at yv /tmp/llvm-asm-failure]$ c++ -O2 -fPIC -o test_sse.gcc.o -msse -c test_avx.cpp 
> test_avx.cpp:9:40: error: expected relocatable expression
>         "vmovups 0x00 + %[xs], %%ymm0\n\t"
>                                        ^
> <inline asm>:2:2: note: instantiated into assembly here
>         vmovups %ymm0, 0x00 + (%rax)
>         ^
> 1 error generated.

Originally spotted by the author of LSP-plugins Vladimir Sadovnikov:
https://github.com/sadko4u/lsp-plugins/issues/154#issuecomment-728394467

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