If the function being called is noreturn it's functionally correct to have a tail call followed by unreachable. It appears to be avoided for normal tail calls for performance reasons, but it's allowed in other guaranteed TCO cases, so I don't think there's any reason to restrict musttail.
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Diff Detail
Diff Detail
| Time | Test | |
|---|---|---|
| 60,080 ms | x64 debian > MLIR.Examples/standalone::test.toy Script:
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: 'RUN: at line 1'; /usr/bin/cmake /var/lib/buildkite-agent/builds/llvm-project/mlir/examples/standalone -G "Ninja" -DCMAKE_CXX_COMPILER=/usr/bin/clang++ -DCMAKE_C_COMPILER=/usr/bin/clang -DLLVM_ENABLE_LIBCXX=OFF -DMLIR_DIR=/var/lib/buildkite-agent/builds/llvm-project/build/lib/cmake/mlir -DLLVM_USE_LINKER=lld
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