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Philip Withnall authored
Both GCC and Clang treat this as a hint that the code won’t be reached, which helps in the cases where they might not have automatically detected it already. It doesn’t change any behaviour of the compiled code, other than allowing the compiler to go off into undefined behaviour. See https://gcc.gnu.org/onlinedocs/gcc-8.3.0/gcc/Other-Builtins.html#index-_005f_005fbuiltin_005funreachable . Signed-off-by: Philip Withnall <withnall@endlessm.com>
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