GNU Compiler Collection (GCC) Internals: Jumps

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#### 11.7.5 Jumps

Other jumps are expressed by either `GOTO_EXPR` or `RETURN_EXPR`.

The operand of a `GOTO_EXPR` must be either a label or a variable containing the address to jump to.

The operand of a `RETURN_EXPR` is either `NULL_TREE`, `RESULT_DECL`, or a `MODIFY_EXPR` which sets the return value. It would be nice to move the `MODIFY_EXPR` into a separate statement, but the special return semantics in `expand_return` make that difficult. It may still happen in the future, perhaps by moving most of that logic into `expand_assignment`.