re PR tree-optimization/92056 (ice in expr_object_size, at tree-object-si ze.c:675 with -O3)

	PR tree-optimization/92056
	* tree-object-size.c (cond_expr_object_size): Return early if then_
	processing resulted in unknown size.

	* gcc.c-torture/compile/pr92056.c: New test.

From-SVN: r277093

gcc/ChangeLog

 2019-10-17  Jakub Jelinek  <jakub@redhat.com>
 
+	PR tree-optimization/92056
+	* tree-object-size.c (cond_expr_object_size): Return early if then_
+	processing resulted in unknown size.
+
 	PR tree-optimization/92115
 	* tree-ssa-ifcombine.c (ifcombine_ifandif): Force condition into
 	temporary if it could trap.

gcc/testsuite/ChangeLog

 2019-10-17  Jakub Jelinek  <jakub@redhat.com>
 
+	PR tree-optimization/92056
+	* gcc.c-torture/compile/pr92056.c: New test.
+
 	PR tree-optimization/92115
 	* gcc.dg/pr92115.c: New test.
 

gcc/testsuite/gcc.c-torture/compile/pr92056.c

+/* PR tree-optimization/92056 */
+
+const char *d;
+
+void
+foo (int c, char *e, const char *a, const char *b)
+{
+  switch (c)
+    {
+    case 33:
+      for (;; d++)
+        if (__builtin_strcmp (b ? : "", d))
+          return;
+      break;
+    case 4:
+      __builtin_sprintf (e, a);
+    }
+}

gcc/tree-object-size.c

@@ -903,6 +903,9 @@ cond_expr_object_size (struct object_size_info *osi, tree var, gimple *stmt)
   else
     expr_object_size (osi, var, then_);
 
+  if (object_sizes[object_size_type][varno] == unknown[object_size_type])
+    return reexamine;
+
   if (TREE_CODE (else_) == SSA_NAME)
     reexamine |= merge_object_sizes (osi, var, else_, 0);
   else