Hi, > > Yes, you should check whether you are in an irreducible loop. This is done > > by > > testing EDGE_IRREDUCIBLE_LOOP flag, > > Alright, I was wondering whether there's any other way. Unfortunately, > here I couldn't do something like > > if (loop_preheader_edge (loop)->flags & EDGE_IRREDUCIBLE_LOOP) > ... > because we're natural loop in a subloop, so I abused the loop exits of > this loop. Hopefully I'm not doing something evil. > > Updated patch attached. Ok if testing passes? Thanks,
yes, this is OK, Zdenek > 2013-01-14 Richard Biener <rguent...@suse.de> > Marek Polacek <pola...@redhat.com> > > PR rtl-optimization/55833 > * loop-unswitch.c (unswitch_loops): Move loop verification... > (unswitch_single_loop): ...here. Call mark_irreducible_loops. > * cfgloopmanip.c (fix_loop_placement): Add IRRED_INVALIDATED parameter. > Set it to true when we're removing a loop from hierarchy tree in > an irreducible region. > (fix_bb_placements): Adjust caller. > (fix_loop_placements): Likewise. > > * gcc.dg/pr55833.c: New test.
