[Bug ipa/81112] [7/8 Regression] internal compiler error: tree check: expected integer_cst, have range_expr in get_len, at tree.h:5321

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81112

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2017-06-16
          Component|middle-end                  |ipa
     Ever confirmed|0                           |1

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Ah, no.  This is ipa-prop.c special code (bah).

Index: gcc/ipa-prop.c
===================================================================
--- gcc/ipa-prop.c      (revision 249245)
+++ gcc/ipa-prop.c      (working copy)
@@ -3030,7 +3030,10 @@ find_constructor_constant_at_offset (tre

          if (index)
            {
-             off = wi::to_offset (index);
+            if (TREE_CODE (index) == RANGE_EXPR)
+              off = wi::to_offset (TREE_OPERAND (index, 0));
+            else
+              off = wi::to_offset (index);
              if (TYPE_DOMAIN (type) && TYPE_MIN_VALUE (TYPE_DOMAIN (type)))
                {
                  tree low_bound = TYPE_MIN_VALUE (TYPE_DOMAIN (type));
@@ -3039,6 +3042,9 @@ find_constructor_constant_at_offset (tre
                                  TYPE_PRECISION (TREE_TYPE (index)));
                }
              off *= wi::to_offset (unit_size);
+            if (TREE_CODE (index) == RANGE_EXPR)
+              off *= wi::sub (wi::to_offset (TREE_OPERAND (index, 1)),
+                              wi::to_offset (TREE_OPERAND (index, 0)));
            }
          else
            off = wi::to_offset (unit_size) * ix;

Fixes this.