re PR c/39648 (internal compiler error: in fold_convert, at fold-const.c:2506)

2009-04-05  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/39648
	* tree-ssa-sccvn.c (vn_reference_fold_indirect): Work around
	our &A vs. &A[0] IL deficiencies.

	* gcc.c-torture/compile/pr39648.c: New testcase.

From-SVN: r145569

gcc/ChangeLog

+2009-04-05  Richard Guenther  <rguenther@suse.de>
+
+	PR tree-optimization/39648
+	* tree-ssa-sccvn.c (vn_reference_fold_indirect): Work around
+	our &A vs. &A[0] IL deficiencies.
+
 2009-04-04  Jan Hubicka  <jh@suse.cz>
 
-	* except.c (sjlj_find_directly_reachable_regions): Be ready for removed toplevel
-	regions.
+	* except.c (sjlj_find_directly_reachable_regions): Be ready for
+	removed toplevel regions.
 	(sjlj_mark_call_sites): Likewise.
 
 2009-04-04  Dave Korn  <dave.korn.cygwin@gmail.com>

gcc/testsuite/ChangeLog

+2009-04-05  Richard Guenther  <rguenther@suse.de>
+
+	PR tree-optimization/39648
+	* gcc.c-torture/compile/pr39648.c: New testcase.
+
 2009-04-05  Jason Merrill  <jason@redhat.com>
 
 	PR c++/14912

gcc/testsuite/gcc.c-torture/compile/pr39648.c

+void
+yysyntax_error (char *yyp)
+{
+        char const *yyf;
+        char yyformat[5];
+
+        yyf = yyformat;
+        while ((*yyp = *yyf) != '\0') {
+                if (yyf[1] == 's')
+                        yyf += 2;
+        }
+}

gcc/tree-ssa-sccvn.c

@@ -757,6 +757,23 @@ vn_reference_fold_indirect (VEC (vn_reference_op_s, heap) **ops,
 
   /* Get ops for the addressed object.  */
   op = VEC_index (vn_reference_op_s, *ops, i);
+  /* ???  If this is our usual typeof &ARRAY vs. &ARRAY[0] problem, work
+     around it to avoid later ICEs.  */
+  if (TREE_CODE (TREE_TYPE (TREE_OPERAND (op->op0, 0))) == ARRAY_TYPE
+      && TREE_CODE (TREE_TYPE (TREE_TYPE (op->op0))) != ARRAY_TYPE)
+    {
+      vn_reference_op_s aref;
+      tree dom;
+      aref.type = TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (op->op0)));
+      aref.opcode = ARRAY_REF;
+      aref.op0 = integer_zero_node;
+      if ((dom = TYPE_DOMAIN (TREE_TYPE (TREE_OPERAND (op->op0, 0))))
+	  && TYPE_MIN_VALUE (dom))
+	aref.op0 = TYPE_MIN_VALUE (dom);
+      aref.op1 = NULL_TREE;
+      aref.op2 = NULL_TREE;
+      VEC_safe_push (vn_reference_op_s, heap, mem, &aref);
+    }
   copy_reference_ops_from_ref (TREE_OPERAND (op->op0, 0), &mem);
 
   /* Do the replacement - we should have at least one op in mem now.  */