llvm/test/Verifier/PhiGrouping.ll

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int "test"(int %i, int %j, bool %c) {
br bool %c, label %A, label %B
A:
br label %C
B:
br label %C
C:
%a = phi int [%i, %A], [%j, %B]
%x = add int %a, 0 ; Error, PHI's should be grouped!
%b = phi int [%i, %A], [%j, %B]
ret int %x
}