diff options
Diffstat (limited to 'gcc/cfgcleanup.c')
| -rw-r--r-- | gcc/cfgcleanup.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/gcc/cfgcleanup.c b/gcc/cfgcleanup.c index 8da967a..a8b38d7 100644 --- a/gcc/cfgcleanup.c +++ b/gcc/cfgcleanup.c @@ -1873,8 +1873,12 @@ try_optimize_cfg (int mode) edge s; bool changed_here = false; - /* Delete trivially dead basic blocks. */ - if (EDGE_COUNT (b->preds) == 0) + /* Delete trivially dead basic blocks. This is either + blocks with no predecessors, or empty blocks with no + successors. Empty blocks may result from expanding + __builtin_unreachable (). */ + if (EDGE_COUNT (b->preds) == 0 + || (EDGE_COUNT (b->succs) == 0 && BB_HEAD (b) == BB_END (b))) { c = b->prev_bb; if (dump_file) |