gcc/testsuite/gcc.target/i386/sibcall-5.c

   1 /* Check that indirect sibcalls understand regparm.  */
   2 /* { dg-do run } */
   3 /* { dg-require-effective-target ia32 } */
   4 /* { dg-options "-O2" } */
   5
   6 extern void abort (void);
   7
   8 int (*f)(int, int) __attribute__((regparm(2)));
   9 int (*g)(int, int, int) __attribute__((regparm(3)));
  10
  11 int __attribute__((noinline))
  12 foo(void)
  13 {
  14   return f(1, 2);
  15 }
  16
  17 int __attribute__((noinline))
  18 bar(void)
  19 {
  20   return g(1, 2, 3);
  21 }
  22
  23 int __attribute__((regparm(2)))
  24 f1(int x, int y)
  25 {
  26   return x*3 + y;
  27 }
  28
  29 int __attribute__((regparm(3)))
  30 g1(int x, int y, int z)
  31 {
  32   return x*9 + y*3 + z;
  33 }
  34
  35 int main()
  36 {
  37   f = f1;
  38   g = g1;
  39   if (foo() != 1*3 + 2)
  40     abort ();
  41   if (bar() != 1*9 + 2*3 + 3)
  42     abort ();
  43   return 0;
  44 }