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Fourth, eliminate the redundant sign extension after an inlined strcmp.  More generally expose the sign extended nature of function return values.

Fifth, see if the ABI defined extension interface can be properly integrated in REE (with some code from IBM's Ajit Agarwal)using a technique Jivan introduced in 2023, we can seamlessly expose the sign extending nature of function return values in the backend which should eliminate another class of unnecessary sign extensions.

Sixth, investigate Ajit's work (IBM) to exploit cases where masking can be viewed as zero-extension within REE.

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