http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56439
--- Comment #4 from Robert "Finny" Merrill <rfmerrill at berkeley dot edu> 2013-02-25 05:46:29 UTC --- Wouldn't that be a reason /against/ doing this: mov r24,r4 lsl r24 mov r4,r24 instead of just lsl r4?