On Fri, Jul 29, 2016 at 11:05:13AM +0200, Georg-Johann Lay wrote: > There might still problems linger around if hard-regs are used: > > Suppose we set the reg in DImode and then get_last_value is called for the > same reg in SImode. Using the DI value might be wrong, e.g. if it is used > to compute the sign (on little endian) or the number of sign bit copies.
rtlanal.c:num_sign_bit_copies1, see the part after /* For a smaller object, just ignore the high bits. */ Cheers, Segher
