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tree-tailcall.c (eliminate_tail_call): Be more careful about not disturbin profile of entry block.

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* tree-tailcall.c (eliminate_tail_call): Be more careful about not
	disturbin profile of entry block.

From-SVN: r254887
This commit is contained in:
Jan Hubicka 2017-11-17 18:44:41 +01:00 committed by Jan Hubicka
parent 3860f31db1
commit db16c1841a
2 changed files with 16 additions and 3 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2017-11-17 Jan Hubicka <hubicka@ucw.cz>
* tree-tailcall.c (eliminate_tail_call): Be more careful about not
disturbin profile of entry block.
2017-11-17 Jan Hubicka <hubicka@ucw.cz>
* ipa-fnsummary.c (estimate_node_size_and_time): Be more tolerant for

14
gcc/tree-tailcall.c
View File

@ -889,10 +889,18 @@ eliminate_tail_call (struct tailcall *t)
/* Number of executions of function has reduced by the tailcall. */
e = single_succ_edge (gsi_bb (t->call_gsi));
decrease_profile (EXIT_BLOCK_PTR_FOR_FN (cfun), e->count ());
decrease_profile (ENTRY_BLOCK_PTR_FOR_FN (cfun), e->count ());
profile_count count = e->count ();
/* When profile is inconsistent and the recursion edge is more frequent
than number of executions of functions, scale it down, so we do not end
up with 0 executions of entry block. */
if (count >= ENTRY_BLOCK_PTR_FOR_FN (cfun)->count)
count = ENTRY_BLOCK_PTR_FOR_FN (cfun)->count.apply_scale (7, 8);
decrease_profile (EXIT_BLOCK_PTR_FOR_FN (cfun), count);
decrease_profile (ENTRY_BLOCK_PTR_FOR_FN (cfun), count);
if (e->dest != EXIT_BLOCK_PTR_FOR_FN (cfun))
decrease_profile (e->dest, e->count ());
decrease_profile (e->dest, count);
/* Replace the call by a jump to the start of function. */
e = redirect_edge_and_branch (single_succ_edge (gsi_bb (t->call_gsi)),