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| author | Ilya Leoshkevich <iii@linux.ibm.com> | 2019-11-12 14:24:35 +0000 |
|---|---|---|
| committer | Ilya Leoshkevich <iii@gcc.gnu.org> | 2019-11-12 14:24:35 +0000 |
| commit | e2d3e85c877af1cdade1dbbb95955c31932caa87 (patch) | |
| tree | 1f76b96a09d6c95ae8895c0b4d7a30b5f4d29a43 /gcc/cfgcleanup.c | |
| parent | 41098a37444b69d7b3b3072fde52e2785bef7012 (diff) | |
| download | gcc-e2d3e85c877af1cdade1dbbb95955c31932caa87.zip gcc-e2d3e85c877af1cdade1dbbb95955c31932caa87.tar.gz gcc-e2d3e85c877af1cdade1dbbb95955c31932caa87.tar.bz2 | |
Free dominance info at the beginning of pass_jump_after_combine
try_forward_edges does not update dominance info, and merge_blocks
relies on it being up-to-date. In PR92430 stale dominance info makes
merge_blocks produce a loop in the dominator tree, which in turn makes
delete_basic_block loop forever.
Fix by freeing dominance info at the beginning of cleanup_cfg.
gcc/ChangeLog:
2019-11-12 Ilya Leoshkevich <iii@linux.ibm.com>
PR rtl-optimization/92430
* cfgcleanup.c (pass_jump_after_combine::execute): Free
dominance info at the beginning.
gcc/testsuite/ChangeLog:
2019-11-12 Ilya Leoshkevich <iii@linux.ibm.com>
PR rtl-optimization/92430
* gcc.dg/pr92430.c: New test (from Arseny Solokha).
From-SVN: r278095
Diffstat (limited to 'gcc/cfgcleanup.c')
| -rw-r--r-- | gcc/cfgcleanup.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/gcc/cfgcleanup.c b/gcc/cfgcleanup.c index 6539d93..7f38825 100644 --- a/gcc/cfgcleanup.c +++ b/gcc/cfgcleanup.c @@ -3311,6 +3311,8 @@ public: unsigned int pass_jump_after_combine::execute (function *) { + /* Jump threading does not keep dominators up-to-date. */ + free_dominance_info (CDI_DOMINATORS); cleanup_cfg (flag_thread_jumps ? CLEANUP_THREADING : 0); return 0; } |