gcc/testsuite/gcc.dg/sibcall-5.c

   1 /* Check that indirect sibcalls understand regparm.  */
   2 /* { dg-do run { target i?86-*-* } } */
   3 /* { dg-options "-O2" } */
   4
   5 int (*f)(int, int) __attribute__((regparm(2)));
   6 int (*g)(int, int, int) __attribute__((regparm(3)));
   7
   8 int __attribute__((noinline))
   9 foo(void)
  10 {
  11   return f(1, 2);
  12 }
  13
  14 int __attribute__((noinline))
  15 bar(void)
  16 {
  17   return g(1, 2, 3);
  18 }
  19
  20 int __attribute__((regparm(2)))
  21 f1(int x, int y)
  22 {
  23   return x*3 + y;
  24 }
  25
  26 int __attribute__((regparm(3)))
  27 g1(int x, int y, int z)
  28 {
  29   return x*9 + y*3 + z;
  30 }
  31
  32 int main()
  33 {
  34   f = f1;
  35   g = g1;
  36   if (foo() != 1*3 + 2)
  37     abort ();
  38   if (bar() != 1*9 + 2*3 + 3)
  39     abort ();
  40   return 0;
  41 }