gcc/testsuite/gcc.dg/tree-ssa/flatten-3.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fno-ipa-icf" } */
   3
   4 extern void do_something_usefull();
   5 /* Check that we finish compiling even if instructed to
   6    flatten a cyclic callgraph.  Verify we correctly
   7    flatten with another function marked flatten in the
   8    callgraph.  */
   9
  10 void __attribute__((flatten)) direct(void)
  11 {
  12   direct();
  13 }
  14
  15
  16 void __attribute__((flatten)) indirect(void);
  17 static void indirect1(void)
  18 {
  19   indirect();
  20 }
  21 void __attribute__((flatten)) indirect(void)
  22 {
  23   indirect1();
  24 }
  25
  26
  27 void __attribute__((flatten)) doubleindirect(void);
  28 static void doubleindirect2(void)
  29 {
  30   doubleindirect();
  31   do_something_usefull ();
  32 }
  33 static void doubleindirect1(void)
  34 {
  35   doubleindirect2();
  36 }
  37 void __attribute__((flatten)) doubleindirect(void)
  38 {
  39   doubleindirect1();
  40 }
  41
  42
  43 static void subcycle1(void);
  44 static void subcycle2(void)
  45 {
  46   subcycle1();
  47   do_something_usefull ();
  48 }
  49 static void subcycle1(void)
  50 {
  51   subcycle2();
  52 }
  53 void __attribute__((flatten)) subcycle(void)
  54 {
  55   subcycle1();
  56 }
  57
  58
  59 static void doublesubcycle1(void);
  60 static void doublesubcycle2(void);
  61 static void doublesubcycle3(void)
  62 {
  63   doublesubcycle1();
  64   do_something_usefull ();
  65 }
  66 static void doublesubcycle2(void)
  67 {
  68   doublesubcycle3();
  69 }
  70 static void doublesubcycle1(void)
  71 {
  72   doublesubcycle2();
  73 }
  74 void __attribute__((flatten)) doublesubcycle(void)
  75 {
  76   doublesubcycle1();
  77 }
  78
  79 /* { dg-final { scan-assembler "cycle\[123\]\[: \t\n\]" } } */