gcc/testsuite/gcc.target/i386/stack-check-17.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fstack-clash-protection -mtune=generic -fomit-frame-pointer" } */
   3 /* { dg-require-effective-target supports_stack_clash_protection } */
   4
   5
   6 int x0, x1;
   7 void f1 (void);
   8 void f2 (int, int);
   9
  10 __attribute__ ((noreturn))
  11 void
  12 f3 (void)
  13 {
  14   int y0 = x0;
  15   int y1 = x1;
  16   f1 ();
  17   f2 (y0, y1);
  18   while (1);
  19 }
  20
  21 /* Verify no explicit probes.  */
  22 /* { dg-final { scan-assembler-not "or\[ql\]" } } */
  23
  24 /* We also want to verify we did not use a push/pop sequence
  25    to probe *sp as the callee register saves are sufficient
  26    to probe *sp.
  27
  28    y0/y1 are live across the call and thus must be allocated
  29    into either a stack slot or callee saved register.  The former
  30    would be rather dumb.  So assume it does not happen.
  31
  32    So search for two/four pushes for the callee register saves/argument
  33    pushes and no pops (since the function has no reachable epilogue).  */
  34 /* { dg-final { scan-assembler-times "push\[ql\]" 2 { target { ! ia32 } } } }  */
  35 /* { dg-final { scan-assembler-times "push\[ql\]" 4 { target { ia32 } } } }  */
  36 /* { dg-final { scan-assembler-not "pop" } } */
  37