It's destroyed by gimple_value_profile_transformations.
Patch updated to move the update_ssa early.
Index: gcc/auto-profile.c
===================================================================
--- gcc/auto-profile.c (revision 216278)
+++ gcc/auto-profile.c (working copy)
@@ -1674,7 +1674,14 @@ afdo_annotate_cfg (const stmt_set &promoted_stmts)
counts_to_freqs ();
}
if (flag_value_profile_transformations)
- gimple_value_profile_transformations ();
+ {
+ gimple_value_profile_transformations ();
+ free_dominance_info (CDI_DOMINATORS);
+ free_dominance_info (CDI_POST_DOMINATORS);
+ calculate_dominance_info (CDI_POST_DOMINATORS);
+ calculate_dominance_info (CDI_DOMINATORS);
+ update_ssa (TODO_update_ssa);
+ }
}
/* Wrapper function to invoke early inliner. */
@@ -1756,7 +1763,6 @@ auto_profile (void)
early_inline ();
autofdo::afdo_annotate_cfg (promoted_stmts);
compute_function_frequency ();
- update_ssa (TODO_update_ssa);
/* Local pure-const may imply need to fixup the cfg. */
if (execute_fixup_cfg () & TODO_cleanup_cfg)
Dehao
On Wed, Oct 15, 2014 at 10:50 AM, Xinliang David Li <davi...@google.com> wrote:
> Is it destroyed by value profile transformations? Can you move the
> dominance recomputing code closer to where it gets invalidated?
>
> David
>
> On Wed, Oct 15, 2014 at 10:37 AM, Dehao Chen <de...@google.com> wrote:
>> This patch recalculates dominance info before update_ssa call in
>> AutoFDO. This fixes bug when dominance info is out-of-date and causes
>> segfaults during update_ssa.
>>
>> Bootstrapped and regression test on-going.
>>
>> OK for google-4_9 branch?
>>
>> Thanks,
>> Dehao
>>
>> Index: gcc/auto-profile.c
>> ===================================================================
>> --- gcc/auto-profile.c (revision 216278)
>> +++ gcc/auto-profile.c (working copy)
>> @@ -1756,6 +1756,11 @@ auto_profile (void)
>> early_inline ();
>> autofdo::afdo_annotate_cfg (promoted_stmts);
>> compute_function_frequency ();
>> +
>> + free_dominance_info (CDI_DOMINATORS);
>> + free_dominance_info (CDI_POST_DOMINATORS);
>> + calculate_dominance_info (CDI_POST_DOMINATORS);
>> + calculate_dominance_info (CDI_DOMINATORS);
>> update_ssa (TODO_update_ssa);
>>
>> /* Local pure-const may imply need to fixup the cfg. */
