Relax cgraph_node::clone_of_p to also look through former clones

2019-03-07  Martin Jambor  <mjambor@suse.cz>

	PR ipa/88235
	* cgraph.h (cgraph_node): New inline method former_thunk_p.
	* cgraph.c (cgraph_node::dump): Dump a note if node is a former thunk.
	(clone_of_p): Treat expanded thunks like thunks, be optimistic if they
	have multiple callees.  At the end check if declarations match as
	opposed to cgraph_nodes.

	testsuite/
	* g++.dg/ipa/pr88235.C: New test.

From-SVN: r269462

2 files changed, 60 insertions, 0 deletions

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index d13a7db..d0bd734 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2019-03-07  Martin Jambor  <mjambor@suse.cz>
+
+	PR ipa/88235
+	* g++.dg/ipa/pr88235.C: New test.
+
 2019-04-07  Richard Biener  <rguenther@suse.de>
 
 	PR middle-end/89618
diff --git a/gcc/testsuite/g++.dg/ipa/pr88235.C b/gcc/testsuite/g++.dg/ipa/pr88235.C
new file mode 100644
index 0000000..29f3252
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ipa/pr88235.C
@@ -0,0 +1,55 @@
+// { dg-do compile }
+// { dg-options "-O1 -fdevirtualize -finline-small-functions -fipa-cp -fipa-cp-clone --param ipa-cp-eval-threshold=125 --param max-inline-insns-single=4" }
+
+extern "C" int printf (const char *, ...);
+enum E { vf_request, vf_event } want;
+
+int errs = 0;
+
+class ivResource {
+public:
+  virtual ~ivResource () { }
+};
+
+class ivHandler   : public ivResource   {
+public:
+  virtual void event() { }
+};
+
+class ivGlyph   : public ivResource   {
+public:
+  virtual ~ivGlyph  () { }
+  virtual void request () {
+    if (want!=vf_request)
+      ++errs;
+  }
+};
+
+class ItemView : public ivGlyph, public ivHandler {
+public:
+  virtual void event () {
+    if (want!=vf_event)
+      ++errs;
+  }
+} a;
+
+ivGlyph *bar() {
+  return &a;
+}
+
+ivHandler *bar2() {
+  return &a;
+}
+
+int main() {
+  want=vf_request;
+  bar()->request();
+  want=vf_event;
+  bar2()->event();
+  if (errs) {
+    printf("FAIL\n");
+    return 1;
+  }
+  printf("PASS\n");
+  return 0;
+}