[Bug tree-optimization/94621] [9/10 Regression] GCC 9.2.1 segfaults when compiling file with -O3 since r9-5354

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94621

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |9.4
            Summary|GCC 9.2.1 segfaults when    |[9/10 Regression] GCC 9.2.1
                   |compiling file with -O3     |segfaults when compiling
                   |                            |file with -O3 since r9-5354
                 CC|                            |jakub at gcc dot gnu.org
           Assignee|unassigned at gcc dot gnu.org      |jakub at gcc dot gnu.org
          Component|c                           |tree-optimization
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2020-04-16
     Ever confirmed|0                           |1

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Started with my r9-5354-gda972c05f48637060ae3a3b121f99d1522413b82
Slightly cleaned up testcase at -O2:
struct S { int c, e[]; };

static inline int
foo (struct S *m, int r, int c)
{
  int (*a)[][m->c] = (int (*)[][m->c])&m->e;
  return (*a)[r][c];
}

void
bar (struct S *a)
{
  foo (a, 0, 0);
}