ptx preliminary rtl patches [3/4]
Thu Sep 11 13:27:00 GMT 2014
nvptx will be the first port to use BImode and have
STORE_FLAG_VALUE==-1. That has exposed a bug in combine where we can end
up calling num_sign_bit_copies for a BImode value. However, the return
value is always 1 in that case, so it doesn't tell us anything and is
going to be misinterpreted by the caller.
Bootstrapped and tested on x86_64-linux, together with the other
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