[llvm-bugs] [Bug 42242] New: optimization complains invalid symbol redefinition

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42242

            Bug ID: 42242
           Summary: optimization complains invalid symbol redefinition
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: zhonghao at pku.org.cn
                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

My clang is 9.0.0, and the code is:

void x();
void rgb2yuv16bit_mmx422_row();

void x()
{
  rgb2yuv16bit_mmx422_row();
}

void rgb2yuv16bit_mmx422_row()
{
  __asm__ __volatile__ (
  "rgb2yuv16_422:\n"
  );
}

clang accepts the code, but with following parameters:

clang -Os | clang -O3 | clang -O2 | clang++ -Os | clang++ -O3 | clang++ -O2 | 

, it rejects the code:

error: invalid symbol redefinition
 "rgb2yuv16_422:\n"
 ^
<inline asm>:1:2: note: instantiated into assembly here
        rgb2yuv16_422:
        ^
1 error generated.

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