re PR fortran/88229 (ICE tree check: expected integer_cst, have nop_expr in…

re PR fortran/88229 (ICE tree check: expected integer_cst, have nop_expr in get_len, at tree.h:5608)

2018-11-28  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/88229
	* tree-ssa.c (non_rewritable_mem_ref_base): Check DECL_SIZE_UNIT
	is an INTEGER_CST before accessing it so.

From-SVN: r266550

gcc/ChangeLog

+2018-11-28  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/88229
+	* tree-ssa.c (non_rewritable_mem_ref_base): Check DECL_SIZE_UNIT
+	is an INTEGER_CST before accessing it so.
+
 2018-11-28  Sam Tebbs  <sam.tebbs@arm.com>
 
 	* doc/invoke.texi (-mtune=): Remove obsolete CPU names.

gcc/tree-ssa.c

@@ -1446,6 +1446,7 @@ non_rewritable_mem_ref_base (tree ref)
 	return NULL_TREE;
       /* For integral typed extracts we can use a BIT_FIELD_REF.  */
       if (DECL_SIZE (decl)
+	  && TREE_CODE (DECL_SIZE_UNIT (decl)) == INTEGER_CST
 	  && (known_subrange_p
 	      (mem_ref_offset (base),
 	       wi::to_poly_offset (TYPE_SIZE_UNIT (TREE_TYPE (base))),