[PR 69920] Prevent SRA from leaving a removed SSA_NAME in IL

2016-02-26  Martin Jambor  <mjambor@suse.cz>

	PR middle-end/69920
	* tree-sra.c (sra_modify_assign): Do not remove loads of
	uninitialized aggregates to SSA_NAMEs.

testsuite/
	* gcc.dg/torture/pr69932.c: New test.
	* gcc.dg/torture/pr69936.c: Likewise.

From-SVN: r233753

gcc/ChangeLog

+2016-02-26  Martin Jambor  <mjambor@suse.cz>
+
+	PR middle-end/69920
+	* tree-sra.c (sra_modify_assign): Do not remove loads of
+	uninitialized aggregates to SSA_NAMEs.
+
 2016-02-26  Richard Henderson  <rth@redhat.com>
 
 	PR target/69709

gcc/testsuite/ChangeLog

+2016-02-26  Martin Jambor  <mjambor@suse.cz>
+
+	PR middle-end/69920
+	* gcc.dg/torture/pr69932.c: New test.
+	* gcc.dg/torture/pr69936.c: Likewise.
+
 2016-02-26  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>
 
 	PR target/69709

gcc/testsuite/gcc.dg/torture/pr69932.c

+/* { dg-do compile } */
+
+int a;
+void fn1() {
+  int b = 4;
+  short c[4];
+  c[b] = c[a];
+  if (c[2]) {}
+
+}

gcc/testsuite/gcc.dg/torture/pr69936.c

+/* { dg-do compile } */
+
+int a;
+char b;
+void fn1(int p1) {}
+
+int fn2() { return 5; }
+
+void fn3() {
+  if (fn2())
+    ;
+  else {
+    char c[5];
+    c[0] = 5;
+  lbl_608:
+    fn1(c[9]);
+    int d = c[9];
+    c[2] | a;
+    d = c[b];
+  }
+  goto lbl_608;
+}
+
+int main() { return 0; }

gcc/tree-sra.c

@@ -3504,7 +3504,8 @@ sra_modify_assign (gimple *stmt, gimple_stmt_iterator *gsi)
       else
 	{
 	  if (access_has_children_p (racc)
-	      && !racc->grp_unscalarized_data)
+	      && !racc->grp_unscalarized_data
+	      && TREE_CODE (lhs) != SSA_NAME)
 	    {
 	      if (dump_file)
 		{