gcc/testsuite/gcc.target/i386/call-1.c

   1 /* PR optimization/11304 */
   2 /* Originator: <manuel.serrano@sophia.inria.fr> */
   3 /* { dg-do run } */
   4 /* { dg-options "-O -fomit-frame-pointer" } */
   5
   6 /* Verify that %eax is always restored after a call.  */
   7
   8 extern void abort(void);
   9
  10 volatile int r;
  11
  12 void set_eax(int val)
  13 {
  14   __asm__ __volatile__ ("mov %0, %%eax" : : "m" (val));
  15 }
  16
  17 void foo(int val)
  18 {
  19   r = val;
  20 }
  21
  22 int bar(int x)
  23 {
  24   if (x)
  25   {
  26     set_eax(0);
  27     return x;
  28   }
  29
  30   foo(x);
  31 }
  32
  33 int main(void)
  34 {
  35   if (bar(1) != 1)
  36     abort();
  37
  38   return 0;
  39 }