Properly redirect alias for MVC (PR ipa/84722).

2018-03-16  Martin Liska  <mliska@suse.cz>

	PR ipa/84722
	* multiple_target.c (create_dispatcher_calls): Redirect also
	an alias.
2018-03-16  Martin Liska  <mliska@suse.cz>

	PR ipa/84722
	* gcc.target/i386/mvc10.c: New test.

From-SVN: r258595

gcc/ChangeLog

+2018-03-16  Martin Liska  <mliska@suse.cz>
+
+	PR ipa/84722
+	* multiple_target.c (create_dispatcher_calls): Redirect also
+	an alias.
+
 2018-03-16  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c++/79937

gcc/multiple_target.c

@@ -145,6 +145,13 @@ create_dispatcher_calls (struct cgraph_node *node)
 		    walk_gimple_stmt (&it, NULL, replace_function_decl, &wi);
 		}
 	    }
+	  else if (ref->use == IPA_REF_ALIAS)
+	    {
+	      symtab_node *source = ref->referring;
+	      ref->remove_reference ();
+	      source->create_reference (inode, IPA_REF_ALIAS);
+	      source->add_to_same_comdat_group (inode);
+	    }
 	  else
 	    gcc_unreachable ();
 	}

gcc/testsuite/ChangeLog

+2018-03-16  Martin Liska  <mliska@suse.cz>
+
+	PR ipa/84722
+	* gcc.target/i386/mvc10.c: New test.
+
 2018-03-16  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c++/79937

gcc/testsuite/gcc.target/i386/mvc10.c

+/* PR ipa/84722.  */
+/* { dg-do run } */
+/* { dg-require-ifunc "" } */
+
+__attribute__ ((target_clones ("avx", "arch=core-avx2", "default"))) int
+foo (int i)
+{
+  return i - 1;
+}
+int weaks (int i) __attribute__ ((weak, alias ("foo")));
+
+int
+main (int argc, char **argv)
+{
+  return weaks (argc);
+}