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re PR middle-end/65950 (exit in main is causing the path to it to become unlikely.)

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2016-10-18  Andrew Pinski  <apinski@cavium.com>

        PR tree-opt/65950
        * predict.c (is_exit_with_zero_arg): New function.
        (tree_bb_level_predictions): Don't consider paths leading to exit(0)
        as nottaken.

From-SVN: r241309
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Andrew Pinski 2016-10-18 15:42:21 +00:00 • committed by Andrew Pinski
parent 5cb96b6a87
commit e25a366f6f
2 changed files with 25 additions and 1 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2016-10-18 Andrew Pinski <apinski@cavium.com>
PR tree-opt/65950
* predict.c (is_exit_with_zero_arg): New function.
(tree_bb_level_predictions): Don't consider paths leading to exit(0)
as nottaken.
2016-10-18 Uros Bizjak <ubizjak@gmail.com>
PR target/77991

19
gcc/predict.c
View file

@ -2512,6 +2512,21 @@ tree_predict_by_opcode (basic_block bb)
}
}
/* Returns TRUE if the STMT is exit(0) like statement. */
static bool
is_exit_with_zero_arg (const gimple *stmt)
{
/* This is not exit, _exit or _Exit. */
if (!gimple_call_builtin_p (stmt, BUILT_IN_EXIT)
&& !gimple_call_builtin_p (stmt, BUILT_IN__EXIT)
&& !gimple_call_builtin_p (stmt, BUILT_IN__EXIT2))
return false;
/* Argument is an interger zero. */
return integer_zerop (gimple_call_arg (stmt, 0));
}
/* Try to guess whether the value of return means error code. */
static enum br_predictor
@ -2638,7 +2653,9 @@ tree_bb_level_predictions (void)
if (is_gimple_call (stmt))
{
if (gimple_call_noreturn_p (stmt) && has_return_edges)
if (gimple_call_noreturn_p (stmt)
&& has_return_edges
&& !is_exit_with_zero_arg (stmt))
predict_paths_leading_to (bb, PRED_NORETURN,
NOT_TAKEN);
decl = gimple_call_fndecl (stmt);