[Bug middle-end/98366] New: [11 Regression] wrong-code with memcmp and -m32

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98366

            Bug ID: 98366
           Summary: [11 Regression] wrong-code with memcmp and -m32
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mpolacek at gcc dot gnu.org
  Target Milestone: ---

struct S {
  int b;
  int alignment;
  int c : 7;
  int d : 8;
} const e[] = {{.0, 3, '(', 2.0}};
typedef struct S S;

int memcmp (const void *, const void *, __SIZE_TYPE__);

int
main ()
{
  _Bool b = (!memcmp(e, (S[]){{.alignment = 3, '(', 2.0}}, sizeof (S)));
  if (!b)
    __builtin_abort ();
}

with -m32 -O2 generates a binary that aborts.  Started with r11-2709.