[llvm-dev] How Instruction and ConstExpr derived from Operator?

[Mahesha S via llvm-dev]

Hi,

Looking at https://llvm.org/doxygen/classllvm_1_1User.html, I don't see any
hierarchical relationship between Instruction and Operator, and the same is
true with ConstExpr and Operator. Then, I am not getting how
Operator::getOpcode() will successfully dyn_cast<> Operator either to
Instruction or to ConstExpr.

Thanks,
Mahesha
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