On Tue, May 21, 2002 at 10:54:53AM +0200, Jan Hubicka wrote: > mem_ref = validize_mem (gen_rtx_MEM (mode, tmp)); > > + set_mem_alias_set (mem_ref, new_alias_set ()); Seems to me you want to do it even earlier. Immediately after the gen_rtx_MEM. r~