https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71448

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I wrote so far
--- fold-const.c.jj1    2016-06-06 19:39:40.000000000 +0200
+++ fold-const.c        2016-06-08 09:56:56.830326277 +0200
@@ -8527,9 +8527,9 @@ fold_comparison (location_t loc, enum tr
          if ((offset0 == offset1
               || (offset0 && offset1
                   && operand_equal_p (offset0, offset1, 0)))
-             && (code == EQ_EXPR
-                 || code == NE_EXPR
-                 || (indirect_base0 && DECL_P (base0))
+             && (equality_code
+                 || (indirect_base0
+                     && (DECL_P (base0) || TREE_CODE (base0) == STRING_CST))
                  || POINTER_TYPE_OVERFLOW_UNDEFINED))

            {
@@ -8568,7 +8568,9 @@ fold_comparison (location_t loc, enum tr
             6.5.6/8 and /9 with respect to the signed ptrdiff_t.  */
          else if (bitpos0 == bitpos1
                   && (equality_code
-                      || (indirect_base0 && DECL_P (base0))
+                      || (indirect_base0
+                          && (DECL_P (base0)
+                              || TREE_CODE (base0) == STRING_CST))
                       || POINTER_TYPE_OVERFLOW_UNDEFINED))
            {
              /* By converting to signed sizetype we cover middle-end pointer
for this which works fine, but you're right CONSTANT_CLASS_P (base0) might be
better.

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