[Bug c++/64106] New: [5 Regression][C++14] internal compiler error: in cxx_eval_store_expression

[ai.azuma at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64106

            Bug ID: 64106
           Summary: [5 Regression][C++14] internal compiler error: in
                    cxx_eval_store_expression
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ai.azuma at gmail dot com

Created attachment 34133
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34133&action=edit
Output of -v option and preprocessed file

The following code causes an ICE on 5.0.0 20141123 with -std=c++1y.

//==========================================
void f(long &c, int &lc, char *&out)
{
  while (lc >= 8) *out++ = (c >> (lc -= 8));
}
//==========================================

The ICE message is "internal compiler error: in cxx_eval_store_expression",
which is the same as one reported in PR64080, so I suspect that this bug report
could be a dup. However, the above reproducer looks very different than one in
PR64080, so I think this is worth being reported independently.

The above code successfully compiles on GCC 4.9.3 20141119 with -std=c++1y, so
it seems a regression. The reproducer originally comes from an OpenCV 2.4.10
source code.