gcc/testsuite/gcc.dg/i386-bitfield1.c

   1 // Test for bitfield alignment in structs on IA-32
   2 // { dg-do run { target i?86-*-* } }
   3 // { dg-options "-O2" }
   4 // { dg-options "-mno-align-double -mno-ms-bitfields" { target *-*-interix* } }
   5
   6 extern void abort (void);
   7 extern void exit (int);
   8
   9 struct A
  10 {
  11   char a;
  12   long long b : 61;
  13   char c;
  14 } a, a4[4];
  15
  16 struct B
  17 {
  18   char d;
  19   struct A e;
  20   char f;
  21 } b;
  22
  23 struct C
  24 {
  25   char g;
  26   union U
  27   {
  28     char u1;
  29     long long u2;
  30     long long u3 : 64;
  31   } h;
  32   char i;
  33 } c;
  34
  35 int main (void)
  36 {
  37   if (&a.c - &a.a != 12)
  38     abort ();
  39   if (sizeof (a) != 16)
  40     abort ();
  41   if (sizeof (a4) != 4 * 16)
  42     abort ();
  43   if (sizeof (b) != 2 * 4 + 16)
  44     abort ();
  45   if (__alignof__ (b.e) != 4)
  46     abort ();
  47   if (&c.i - &c.g != 12)
  48     abort ();
  49   if (sizeof (c) != 16)
  50     abort ();
  51   if (__alignof__ (c.h) != 4)
  52     abort ();
  53   exit (0);
  54 }