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convert_move has special code to handle conversion to and from
MODE_PARTIAL_INT. Above this code is a comment stating that targets are
expected to provide conversion insns for the MODE_PARTIAL_INT modes they
When presented with a move from HImode to PSImode, however, this code will
unconditionally convert HImode to SImode, then truncate back down to
PSImode. For cases where both these operations are fairly expensive, it
should instead first check to see whether the target provided the desired