> -----Original Message----- > From: gcc-ow...@gcc.gnu.org [mailto:gcc-ow...@gcc.gnu.org] On Behalf Of Paulo > Matos > Sent: 13 March 2014 11:21 > To: Richard Biener > Cc: gcc@gcc.gnu.org > Subject: RE: dom requires PROP_loops > > > PROP_loops is enabled from tree loopinit to rtl loop_done2 and with this > property > enabled cfg_cleanup doesn't remove empty latches allowing GCC to move > instructions into the latch in the meantime. >
Let me clarify this statement. With PROP_loops enabled, loop_optimizer_finalize doesn't free loops and current_loops is non-null. This has an array of consequences, one of them being that loop latches are not removed. So, which PROP_loops is the reason for the non-removal of empty loop latches, removal actually depends on the value of current_loops. -- Paulo Matos
