gnu/dist/gcc4/gcc/testsuite/gcc.target/i386/bitfield1.c

   1 // Test for bitfield alignment in structs on IA-32
   2 // { dg-do run { target i?86-*-* x86_64-*-* } }
   3 // { dg-require-effective-target ilp32 }
   4 // { dg-options "-O2" }
   5 // { dg-options "-mno-align-double -mno-ms-bitfields" { target i?86-*-interix* i?86-*-cygwin* i?86-*-mingw*} }
   6
   7 extern void abort (void);
   8 extern void exit (int);
   9
  10 struct A
  11 {
  12   char a;
  13   long long b : 61;
  14   char c;
  15 } a, a4[4];
  16
  17 struct B
  18 {
  19   char d;
  20   struct A e;
  21   char f;
  22 } b;
  23
  24 struct C
  25 {
  26   char g;
  27   union U
  28   {
  29     char u1;
  30     long long u2;
  31     long long u3 : 64;
  32   } h;
  33   char i;
  34 } c;
  35
  36 int main (void)
  37 {
  38   if (&a.c - &a.a != 12)
  39     abort ();
  40   if (sizeof (a) != 16)
  41     abort ();
  42   if (sizeof (a4) != 4 * 16)
  43     abort ();
  44   if (sizeof (b) != 2 * 4 + 16)
  45     abort ();
  46   if (__alignof__ (b.e) != 4)
  47     abort ();
  48   if (&c.i - &c.g != 12)
  49     abort ();
  50   if (sizeof (c) != 16)
  51     abort ();
  52   if (__alignof__ (c.h) != 4)
  53     abort ();
  54   exit (0);
  55 }