gcc/testsuite/gcc.dg/20020224-1.c

   1 /* PR target/5755
   2    This testcase failed because the caller of a function returning struct
   3    expected the callee to pop up the hidden return structure pointer,
   4    while callee was actually not poping it up (as the hidden argument
   5    was passed in register).  */
   6 /* { dg-do run { target i?86-*-* } } */
   7 /* { dg-options "-O2 -fomit-frame-pointer" } */
   8
   9 extern void abort (void);
  10 extern void exit (int);
  11
  12 typedef struct {
  13    int a1, a2;
  14 } A;
  15
  16 A a;
  17
  18 A __attribute__ ((regparm (2)))
  19 foo (int x)
  20 {
  21   return a;
  22 }
  23
  24 int __attribute__ ((regparm (2)))
  25 bar (int x)
  26 {
  27   int r = foo(0).a2;
  28   return r;
  29 }
  30
  31 int
  32 main ()
  33 {
  34   int f;
  35   a.a1 = 530;
  36   a.a2 = 980;
  37   f = bar (0);
  38   if (f != 980)
  39     abort ();
  40   exit (0);
  41 }