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/* { dg-do run } */

/* { dg-options "-O2" } */

/* { dg-options "-O2 -fno-short-enums -Wl,--no-enum-size-warning" {target arm_eabi} } */

/* This testcase got misoptimized by combine due to a wrong setting of

   subst_low_luid in try_combine.  */

enum rtx_code {

  A, B

};

void abort (void);

struct rtx_def {

  __extension__ enum rtx_code code:16;

};

typedef struct rtx_def *rtx;

void __attribute__((noinline))

add_constraint (unsigned char is_a)

{

  if (is_a)

    abort ();

}

void __attribute__((noinline))

foo (rtx defn)

{

  switch (defn->code)

    {

    case A:

    case B:

      add_constraint (defn->code == A);

      break;

    default:

      break;

    }

}

int

main ()

{

  struct rtx_def r;

  r.code = B;

  foo (&r);

  return 0;

}