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| author | Jan Hubicka <hubicka@ucw.cz> | 2017-02-11 18:56:02 +0100 |
|---|---|---|
| committer | Jan Hubicka <hubicka@gcc.gnu.org> | 2017-02-11 17:56:02 +0000 |
| commit | acbbac0444a599e77b59b4d21186c9c2118b9f84 (patch) | |
| tree | 0efc3420ad98c534a5761346fa3b54636f7219b0 | |
| parent | bc61048a143b10d8efdc50195f2fc949d036ca92 (diff) | |
| download | gcc-acbbac0444a599e77b59b4d21186c9c2118b9f84.zip gcc-acbbac0444a599e77b59b4d21186c9c2118b9f84.tar.gz gcc-acbbac0444a599e77b59b4d21186c9c2118b9f84.tar.bz2 | |
re PR middle-end/56727 (Recursive call goes through the PLT unnecessarily)
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
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/ipa-utils.c | 18 | ||||
| -rw-r--r-- | gcc/testsuite/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.dg/tree-ssa/pr56727.c | 16 |
4 files changed, 42 insertions, 2 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 424fb4f..969fccf 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,5 +1,10 @@ 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 * ipa-inline-analysis.c (get_minimal_bb): New function. (record_modified): Use it. diff --git a/gcc/ipa-utils.c b/gcc/ipa-utils.c index fc1ae1e..98a4f11 100644 --- a/gcc/ipa-utils.c +++ b/gcc/ipa-utils.c @@ -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); - - return dest_node->semantically_equivalent_p (cnode); + ipa_ref *alias; + enum availability avail; + + 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; } diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index 7a5abd8..a6afdf5 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -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 diff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr56727.c b/gcc/testsuite/gcc.dg/tree-ssa/pr56727.c new file mode 100644 index 0000000..eaf8b5c --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/pr56727.c @@ -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" } } */ |