1 /* Simple check that sibling calls are performed from a 2 void non-leaf-function taking one int argument calling a function which 3 is about the same as itself. 4 5 Copyright (C) 2002 Free Software Foundation Inc. 6 Contributed by Hans-Peter Nilsson <hp@bitrange.com> */ 7 8 /* { dg-do run { xfail arc-*-* avr-*-* c4x-*-* cris-*-* h8300-*-* i370-*-* i960-*-* ip2k-*-* m32r-*-* m68hc1?-*-* m681?-*-* m680*-*-* m68k-*-* mcore-*-* mips*-*-* mn10?00-*-* ns32k-*-* s390*-*-* xstormy16-*-* v850*-*-* vax-*-* xtensa-*-* } } */ 9 /* { dg-options "-O2 -foptimize-sibling-calls" } */ 10 11 /* The option -foptimize-sibling-calls is the default, but serves as 12 marker. This test is xfailed on targets without sibcall patterns 13 (except targets where the test does not work due to the return address 14 not saved on the regular stack). */ 15 16 static void recurser_void1 (int); 17 static void recurser_void2 (int); 18 extern void track (int); 19 20 int main () 21 { 22 recurser_void1 (0); 23 exit (0); 24 } 25 26 /* The functions should get the same stack-frame, and best way to make it 27 reasonably sure is to make them have the same contents (regarding the 28 n tests). */ 29 30 static void 31 recurser_void1 (int n) 32 { 33 if (n == 0 || n == 7 || n == 8) 34 track (n); 35 36 if (n == 10) 37 return; 38 39 recurser_void2 (n + 1); 40 } 41 42 static void 43 recurser_void2 (int n) 44 { 45 if (n == 0 || n == 7 || n == 8) 46 track (n); 47 48 if (n == 10) 49 return; 50 51 recurser_void1 (n + 1); 52 } 53 54 void *trackpoint; 55 56 void 57 track (int n) 58 { 59 char stackpos[1]; 60 61 if (n == 0) 62 trackpoint = stackpos; 63 else if ((n != 7 && n != 8) || trackpoint != stackpos) 64 abort (); 65 } 66