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Re: [patch] expr.c: Fix PR middle-end/18008.
>> After the tree optimizers run, I get
>> b->b = (<unnamed type>) (unsigned char) v;
>> where <unnamed type> is a 2-bit integer type. The problem is that we
>> get ANDs from two places. The first one is generated by the cast to
>> (<unnamed type>). The second one is from the assignment, more
>> specifically store_bit_field.
>> The patch fixes the problem by stripping a narrowing conversion.
It seems to me that the right fix is to avoid generating an AND in
store_bit_field if the value assigned is already appropriately narrow.