diff options
Diffstat (limited to 'gcc/cfgloopmanip.c')
| -rw-r--r-- | gcc/cfgloopmanip.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/gcc/cfgloopmanip.c b/gcc/cfgloopmanip.c index aa9ab66454e..3802f9cff12 100644 --- a/gcc/cfgloopmanip.c +++ b/gcc/cfgloopmanip.c @@ -1,5 +1,5 @@ /* Loop manipulation code for GNU compiler. - Copyright (C) 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010 + Copyright (C) 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc. This file is part of GCC. @@ -174,7 +174,7 @@ fix_bb_placements (basic_block from, { sbitmap in_queue; basic_block *queue, *qtop, *qbeg, *qend; - struct loop *base_loop; + struct loop *base_loop, *target_loop; edge e; /* We pass through blocks back-reachable from FROM, testing whether some @@ -214,12 +214,14 @@ fix_bb_placements (basic_block from, /* Subloop header, maybe move the loop upward. */ if (!fix_loop_placement (from->loop_father)) continue; + target_loop = loop_outer (from->loop_father); } else { /* Ordinary basic block. */ if (!fix_bb_placement (from)) continue; + target_loop = from->loop_father; } FOR_EACH_EDGE (e, ei, from->succs) @@ -248,9 +250,12 @@ fix_bb_placements (basic_block from, && (nca == base_loop || nca != pred->loop_father)) pred = pred->loop_father->header; - else if (!flow_loop_nested_p (from->loop_father, pred->loop_father)) + else if (!flow_loop_nested_p (target_loop, pred->loop_father)) { - /* No point in processing it. */ + /* If PRED is already higher in the loop hierarchy than the + TARGET_LOOP to that we moved FROM, the change of the position + of FROM does not affect the position of PRED, so there is no + point in processing it. */ continue; } |