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re PR middle-end/56727 (Recursive call goes through the PLT unnecessarily)

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PR tree-ssa/56727
	* gcc.dg/tree-ssa/pr56727.c: New testcase.
	* ipa-utils.c (recursive_call_p): Be more careful about interposition.

From-SVN: r245359
This commit is contained in:
Jan Hubicka 2017-02-11 18:56:02 +01:00 • committed by Jan Hubicka
parent bc61048a14
commit acbbac0444
4 changed files with 41 additions and 1 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2017-02-11 Jan Hubicka <hubicka@ucw.cz>
PR tree-ssa/56727
* gcc.dg/tree-ssa/pr56727.c: New testcase.
2017-02-11 Jan Hubicka <hubicka@ucw.cz>
PR ipa/79224

16
gcc/ipa-utils.c
View file

@ -639,6 +639,20 @@ recursive_call_p (tree func, tree dest)
{
struct cgraph_node *dest_node = cgraph_node::get_create (dest);
struct cgraph_node *cnode = cgraph_node::get_create (func);
ipa_ref *alias;
enum availability avail;
return dest_node->semantically_equivalent_p (cnode);
gcc_assert (!cnode->alias);
if (cnode != dest_node->ultimate_alias_target (&avail))
return false;
if (avail >= AVAIL_AVAILABLE)
return true;
if (!dest_node->semantically_equivalent_p (cnode))
return false;
/* If there is only one way to call the fuction or we know all of them
are semantically equivalent, we still can consider call recursive. */
FOR_EACH_ALIAS (cnode, alias)
if (!dest_node->semantically_equivalent_p (alias->referring))
return false;
return true;
}

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2017-02-11 Jan Hubicka <hubicka@ucw.cz>
PR tree-ssa/56727
* gcc.dg/tree-ssa/pr56727.c: New testcase.
2017-02-10 Jakub Jelinek <jakub@redhat.com>
PR c++/79457

16
gcc/testsuite/gcc.dg/tree-ssa/pr56727.c Normal file
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@ -0,0 +1,16 @@
/* { dg-require-alias "" } */
/* { dg-do compile { target fpic } } *
/* { dg-options "-O2 -fPIC -fdump-tree-optimized" } */
void do_not_optimize(int b)
{
do_not_optimize(0);
}
void do_optimize(int b)
{
do_optimize(0);
}
void g(int b) __attribute__((alias(("do_not_optimize"))));
/* { dg-final { scan-tree-dump "do_not_optimize .0" "optimized" } } */
/* { dg-final { scan-tree-dump-not "do_optimize .0" "optimized" } } */