<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/55000>55000</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [FuncSpec] Assertion in Value::doRAUW
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          labrinea
      </td>
    </tr>
</table>

<pre>
    I found this when performing a two-stage build of clang with Function Specialization enabled and tuned aggresively. The crash appears only on release builds. Hereby is the offending command line:

`/home/alelab01/oss-llvm/funcspec_release/bin/clang++  -DGTEST_HAS_RTTI=0 -D_DEBUG -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -Ilib/Target/NVPTX -I/home/alelab01/oss-llvm/llvm-project/llvm/lib/Target/NVPTX -Iinclude -I/home/alelab01/oss-llvm/llvm-project/llvm/include -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wc++98-compat-extra-semi -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wstring-conversion -Wmisleading-indentation -fdiagnostics-color -ffunction-sections -fdata-sections -flto=full -O3 -DNDEBUG -fvisibility=hidden    -fno-exceptions -fno-rtti -UNDEBUG -std=c++14 -MD -MT lib/Target/NVPTX/CMakeFiles/LLVMNVPTXCodeGen.dir/NVPTXISelLowering.cpp.o -MF lib/Target/NVPTX/CMakeFiles/LLVMNVPTXCodeGen.dir/NVPTXISelLowering.cpp.o.d -o lib/Target/NVPTX/CMakeFiles/LLVMNVPTXCodeGen.dir/NVPTXISelLowering.cpp.o -c /home/alelab01/oss-llvm/llvm-project/llvm/lib/Target/NVPTX/NVPTXISelLowering.cpp`

I kept the IR just before the crash via `print-after-all` and reduced it with bugpoint.
</pre>
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