[Bug tree-optimization/92706] New: SRA confuses FRE

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92706

            Bug ID: 92706
           Summary: SRA confuses FRE
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rguenth at gcc dot gnu.org
  Target Milestone: ---

Reduced from one of the issues in PR92645

struct S { int i[4]; } __attribute__((aligned(128)));
typedef __int128_t my_int128 __attribute__((may_alias));
__int128_t load (void *p)
{
  struct S v;
  __builtin_memcpy (&v, p, sizeof (struct S));
  struct S u;
  u = v;
  struct S w;
  w = u;
  return *(my_int128 *)&w;
}