> Since r230164, in PR68330 combine ends up with a sign_extend of an > lshiftrt by some constant, and it does not know to morph that into a > zero_extract (the extend will always extend with zeroes). I think > it is best to let simplify-rtx always replace such a sign_extend by > a zero_extend, after which everything works as expected.
Agreed. > 2015-11-15 Segher Boessenkool <seg...@kernel.crashing.org> > > PR rtl-optimization/68330 > * simplify-rtx.c (simplify_unary_operation_1): Simplify SIGN_EXTEND > of LSHIFTRT by a non-zero constant integer. OK, thanks. -- Eric Botcazou
