diff options
Diffstat (limited to 'gcc/tree-cfg.c')
| -rw-r--r-- | gcc/tree-cfg.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/gcc/tree-cfg.c b/gcc/tree-cfg.c index cdab639..ff72601 100644 --- a/gcc/tree-cfg.c +++ b/gcc/tree-cfg.c @@ -1674,8 +1674,12 @@ gimple_can_merge_blocks_p (basic_block a, basic_block b) return false; } - /* Protect the loop latches. */ - if (current_loops && b->loop_father->latch == b) + /* Protect simple loop latches. We only want to avoid merging + the latch with the loop header in this case. */ + if (current_loops + && b->loop_father->latch == b + && loops_state_satisfies_p (LOOPS_HAVE_SIMPLE_LATCHES) + && b->loop_father->header == a) return false; /* It must be possible to eliminate all phi nodes in B. If ssa form |