[Bug middle-end/56548] [4.8 Regression] ICE in emit_move_insn, at expr.c:3486 with -march=pentium{pro,2,3} -O3

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56548



--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-03-06 
18:18:52 UTC ---

But you can't achieve that through generation of invalid RTL.



Anyway, I wonder why nonzero_bits during combine doesn't figure out that the

upper bits are already all zero and optimize away the masking.