diff options
| author | aoliva <aoliva@138bc75d-0d04-0410-961f-82ee72b054a4> | 2014-02-28 12:57:06 +0000 |
|---|---|---|
| committer | aoliva <aoliva@138bc75d-0d04-0410-961f-82ee72b054a4> | 2014-02-28 12:57:06 +0000 |
| commit | e6aeb304a315c7f9f6ed43fe208036efcb9f760a (patch) | |
| tree | 7d53a818d98bcca10434e439b2d2301235657e96 /gcc/cselib.c | |
| parent | 50f4b776667225611302c24037acf6159b1f1659 (diff) | |
PR debug/59992
* cselib.c (remove_useless_values): Skip to avoid quadratic
behavior if the condition moved from...
(cselib_process_insn): ... here holds.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@208220 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/cselib.c')
| -rw-r--r-- | gcc/cselib.c | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/gcc/cselib.c b/gcc/cselib.c index 525e717c633..dabd2d32f63 100644 --- a/gcc/cselib.c +++ b/gcc/cselib.c @@ -662,6 +662,14 @@ remove_useless_values (void) { cselib_val **p, *v; + if (n_useless_values <= MAX_USELESS_VALUES + /* remove_useless_values is linear in the hash table size. Avoid + quadratic behavior for very large hashtables with very few + useless elements. */ + || ((unsigned int)n_useless_values + <= (cselib_hash_table.elements () - n_debug_values) / 4)) + return; + /* First pass: eliminate locations that reference the value. That in turn can make more values useless. */ do @@ -2693,13 +2701,7 @@ cselib_process_insn (rtx insn) cselib_current_insn = NULL_RTX; - if (n_useless_values > MAX_USELESS_VALUES - /* remove_useless_values is linear in the hash table size. Avoid - quadratic behavior for very large hashtables with very few - useless elements. */ - && ((unsigned int)n_useless_values - > (cselib_hash_table.elements () - n_debug_values) / 4)) - remove_useless_values (); + remove_useless_values (); } /* Initialize cselib for one pass. The caller must also call |