re PR tree-optimization/55355 (internal compiler error: in tree_low_cst, at tree.c:6415)

2012-12-21  Martin Jambor  <mjambor@suse.cz>

	PR tree-optimization/55355
	* tree-sra.c (type_internals_preclude_sra_p): Also check that
	bit_position is small enough to fit a single HOST_WIDE_INT.

	* testsuite/g++.dg/torture/pr55355.C: New test.

From-SVN: r194682

gcc/ChangeLog

+2012-12-21  Martin Jambor  <mjambor@suse.cz>
+
+	PR tree-optimization/55355
+	* tree-sra.c (type_internals_preclude_sra_p): Also check that
+	bit_position is small enough to fit a single HOST_WIDE_INT.
+
 2012-12-21  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* rtlanal.c (volatile_insn_p): Delete commented out code.

gcc/testsuite/ChangeLog

+2012-12-21  Martin Jambor  <mjambor@suse.cz>
+
+	PR tree-optimization/55355
+	* g++.dg/torture/pr55355.C: New test.
+
 2012-12-21  Vladimir Makarov  <vmakarov@redhat.com>
 
 	PR middle-end/55775

gcc/testsuite/g++.dg/torture/pr55355.C

+/* { dg-do compile } */
+
+struct A
+{
+    void funcA(void);
+};
+
+struct B {};
+
+struct C
+{
+    void funcC(void) { a_mp->funcA(); }
+
+    char buf_ma[268435456];
+    A   *a_mp;
+    B    b_m;
+};
+
+void
+func(C *c_p)
+{
+    c_p->funcC();
+}

gcc/tree-sra.c

@@ -714,7 +714,12 @@ type_internals_preclude_sra_p (tree type, const char **msg)
 	      {
 	        *msg = "structure field size not fixed";
 		return true;
-	      }	      
+	      }
+	    if (!host_integerp (bit_position (fld), 0))
+	      {
+	        *msg = "structure field size too big";
+		return true;
+	      }
 	    if (AGGREGATE_TYPE_P (ft)
 		    && int_bit_position (fld) % BITS_PER_UNIT != 0)
 	      {