gcc/testsuite/gcc.dg/20000724-1.c

   1 /* { dg-do run { target i?86-*-linux* } } */
   2 /* { dg-options "-O2 -fomit-frame-pointer" } */
   3
   4 extern void abort (void);
   5 extern void exit (int);
   6
   7 struct s {
   8   struct { int a; } a;
   9   int b;
  10   struct { struct { int a; } a; struct t { struct t *a, *b; } b; } c;
  11 };
  12
  13 int bar(int (*fn)(void *), void *arg, unsigned long flags)
  14 {
  15   return 0;
  16 }
  17
  18 int baz(void *x)
  19 {
  20   return 0;
  21 }
  22
  23 void do_check (struct s *) asm ("do_check") __attribute__((regparm(1)));
  24
  25 void __attribute__((regparm(1))) do_check(struct s *x)
  26 {
  27   if (x->a.a || x->b || x->c.a.a)
  28     abort();
  29   if (x->c.b.a != &x->c.b || x->c.b.b != &x->c.b)
  30     abort();
  31 }
  32
  33 #define NT "\n\t"
  34
  35 asm ("\n"
  36 "___checkme:"
  37 NT      "pushl %eax; pushl %ebx; pushl %ecx; pushl %edx; pushl %esi; pushl %edi"
  38
  39 NT      "pushl $0; pushl $0; pushl $0; pushl $0; pushl $0"
  40 NT      "pushl $0; pushl $0; pushl $0; pushl $0; pushl $0"
  41
  42 NT      "movl %ecx, %eax"
  43 NT      "call do_check"
  44
  45 NT      "popl %eax; popl %eax; popl %eax; popl %eax; popl %eax"
  46 NT      "popl %eax; popl %eax; popl %eax; popl %eax; popl %eax"
  47
  48 NT      "popl %edi; popl %esi; popl %edx; popl %ecx; popl %ebx; popl %eax"
  49 NT      "ret"
  50 );
  51
  52 extern inline void do_asm(struct s * x)
  53 {
  54   asm volatile("call ___checkme" : : "c" (x) : "memory");
  55 }
  56
  57 int foo(void)
  58 {
  59   struct s x = { { 0 }, 0, { { 0 }, { &x.c.b, &x.c.b } } };
  60   bar(baz, &x, 1);
  61   do_asm(&x);
  62   bar(baz, &x, 1);
  63   do_asm(&x);
  64   return 0;
  65 }
  66
  67 int main()
  68 {
  69   foo();
  70   exit(0);
  71 }