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3.7.2.2 Reversal Operator Pair Kill

The optimization removes the reversal transform operator pair occurrences. The reversal transform is (here) the transform that doubly applied is the null transform.

The struct x1f4_operator_type operator definition is to include the X1f4_E4_KILL_PAIR bit in its flags bits list field.

See struct x1f4_operator_type.

See Prefix Unary Operator Flags.

It applies for such operators as the C unary ‘-’ and ‘~’.

The optimization transforms expressions like:

--e

into:

e