diff options
Diffstat (limited to 'gcc/dominance.c')
| -rw-r--r-- | gcc/dominance.c | 31 |
1 files changed, 26 insertions, 5 deletions
diff --git a/gcc/dominance.c b/gcc/dominance.c index f001c680243..ce977e292fe 100644 --- a/gcc/dominance.c +++ b/gcc/dominance.c @@ -30,7 +30,7 @@ The algorithm computes this dominator tree implicitly by computing for each block its immediate dominator. We use tree balancing and path - compression, so its the O(e*a(e,v)) variant, where a(e,v) is the very + compression, so it's the O(e*a(e,v)) variant, where a(e,v) is the very slowly growing functional inverse of the Ackerman function. */ #include "config.h" @@ -372,7 +372,7 @@ calc_dfs_tree (struct dom_info *di, enum cdi_direction reverse) di->nodes = di->dfsnum - 1; - /* This aborts e.g. when there is _no_ path from ENTRY to EXIT at all. */ + /* Make sure there is a path from ENTRY to EXIT at all. */ gcc_assert (di->nodes == (unsigned int) n_basic_blocks + 1); } @@ -659,11 +659,11 @@ free_dominance_info (enum cdi_direction dir) FOR_ALL_BB (bb) { - delete_from_dominance_info (dir, bb); + et_free_tree_force (bb->dom[dir]); + bb->dom[dir] = NULL; } - /* If there are any nodes left, something is wrong. */ - gcc_assert (!n_bbs_in_dom_tree[dir]); + n_bbs_in_dom_tree[dir] = 0; dom_computed[dir] = DOM_NONE; } @@ -797,6 +797,27 @@ nearest_common_dominator (enum cdi_direction dir, basic_block bb1, basic_block b return et_nca (bb1->dom[dir], bb2->dom[dir])->data; } + +/* Find the nearest common dominator for the basic blocks in BLOCKS, + using dominance direction DIR. */ + +basic_block +nearest_common_dominator_for_set (enum cdi_direction dir, bitmap blocks) +{ + unsigned i, first; + bitmap_iterator bi; + basic_block dom; + + first = bitmap_first_set_bit (blocks); + dom = BASIC_BLOCK (first); + EXECUTE_IF_SET_IN_BITMAP (blocks, 0, i, bi) + if (dom != BASIC_BLOCK (i)) + dom = nearest_common_dominator (dir, dom, BASIC_BLOCK (i)); + + return dom; +} + + /* Return TRUE in case BB1 is dominated by BB2. */ bool dominated_by_p (enum cdi_direction dir, basic_block bb1, basic_block bb2) |