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| author | Jeff Law <law@redhat.com> | 2015-10-26 09:36:04 -0600 |
|---|---|---|
| committer | Jeff Law <law@gcc.gnu.org> | 2015-10-26 09:36:04 -0600 |
| commit | c67e5194634c5c3dfd16580e862fb9d4a4552bc9 (patch) | |
| tree | a68e04085366e1abc4cc40f951f5ad25faa89a6e /gcc | |
| parent | 335dde2981e5680619d25bf934527c9549959569 (diff) | |
| download | gcc-c67e5194634c5c3dfd16580e862fb9d4a4552bc9.zip gcc-c67e5194634c5c3dfd16580e862fb9d4a4552bc9.tar.gz gcc-c67e5194634c5c3dfd16580e862fb9d4a4552bc9.tar.bz2 | |
[PATCH] [PR tree-optimization/68013] Make sure first block in FSM path
is in VISITED_BBs
PR tree-optimization/68013
* tree-ssa-threadbackward.c
(fsm_find_control_statement_thread_paths): Make sure the first block
in the path is in VISITED_BBs.
PR tree-optimization/68013
* gcc.c-torture/compile/pr68013.c: New test.
From-SVN: r229375
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 7 | ||||
| -rw-r--r-- | gcc/testsuite/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.c-torture/compile/pr68013.c | 16 | ||||
| -rw-r--r-- | gcc/tree-ssa-threadbackward.c | 5 |
4 files changed, 33 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 95479f3..b5cfa1e 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,10 @@ +2015-10-26 Jeff Law <law@redhat.com> + + PR tree-optimization/68013 + * tree-ssa-threadbackward.c + (fsm_find_control_statement_thread_paths): Make sure the first block + in the path is in VISITED_BBs. + 2015-10-26 Richard Biener <rguenther@suse.de> Dominik Vogt <vogt@linux.vnet.ibm.com> diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index fd5ade4..688f745 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,8 @@ +2015-10-26 Jeff Law <law@redhat.com> + + PR tree-optimization/68013 + * gcc.c-torture/compile/pr68013.c: New test. + 2015-10-26 Richard Biener <rguenther@suse.de> Dominik Vogt <vogt@linux.vnet.ibm.com> diff --git a/gcc/testsuite/gcc.c-torture/compile/pr68013.c b/gcc/testsuite/gcc.c-torture/compile/pr68013.c new file mode 100644 index 0000000..cc500da --- /dev/null +++ b/gcc/testsuite/gcc.c-torture/compile/pr68013.c @@ -0,0 +1,16 @@ +int a, b, c, d, e, f; + +void +fn1 () +{ + for (; e;) + { + e = f; + for (; b;) + { + b = a; + f = a || d ? 0 : c; + } + d = 0; + } +} diff --git a/gcc/tree-ssa-threadbackward.c b/gcc/tree-ssa-threadbackward.c index 9128094..cfb4ace 100644 --- a/gcc/tree-ssa-threadbackward.c +++ b/gcc/tree-ssa-threadbackward.c @@ -136,6 +136,11 @@ fsm_find_control_statement_thread_paths (tree name, vec<basic_block, va_gc> *next_path; vec_alloc (next_path, n_basic_blocks_for_fn (cfun)); + /* When VAR_BB == LAST_BB_IN_PATH, then the first block in the path + will already be in VISITED_BBS. When they are not equal, then we + must ensure that first block is accounted for to ensure we do not + create bogus jump threading paths. */ + visited_bbs->add ((*path)[0]); FOR_EACH_EDGE (e, ei, last_bb_in_path->preds) { hash_set<basic_block> *visited_bbs = new hash_set<basic_block>; |