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111
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1 /* Simple check that sibling calls are performed from a
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2 void non-leaf-function taking no arguments calling a function which
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3 is about the same as itself.
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4
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5 Copyright (C) 2002 Free Software Foundation Inc.
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6 Contributed by Hans-Peter Nilsson <hp@bitrange.com> */
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7
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131
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8 /* { dg-do run { xfail { { cris-*-* crisv32-*-* csky-*-* h8300-*-* hppa*64*-*-* m32r-*-* mcore-*-* mn10300-*-* msp430*-*-* nds32*-*-* xstormy16-*-* v850*-*-* vax-*-* xtensa*-*-* } || { arm*-*-* && { ! arm32 } } } } } */
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111
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9 /* -mlongcall disables sibcall patterns. */
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10 /* { dg-skip-if "" { powerpc*-*-* } { "-mlongcall" } { "" } } */
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11 /* -msave-restore disables sibcall patterns. */
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12 /* { dg-skip-if "" { riscv*-*-* } { "-msave-restore" } { "" } } */
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13 /* { dg-options "-O2 -foptimize-sibling-calls" } */
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14
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15 /* The option -foptimize-sibling-calls is the default, but serves as
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16 marker. This test is xfailed on targets without sibcall patterns
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17 (except targets where the test does not work due to the return address
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18 not saved on the regular stack). */
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19
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20 extern void abort (void);
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21 extern void exit (int);
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22
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23 /* Sibcalls are not supported in MIPS16 mode, which has direct calls but
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24 not direct jumps. */
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25 #ifdef __mips
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26 #define ATTR __attribute__((nomips16))
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27 #else
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28 #define ATTR
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29 #endif
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30
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31 static ATTR void recurser_void1 (void);
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32 static ATTR void recurser_void2 (void);
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33 extern void track (void);
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34 volatile int v;
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35
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36 int n = 0;
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37 int main ()
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38 {
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39 recurser_void1 ();
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40 if (v != 5)
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41 abort ();
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42 exit (0);
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43 }
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44
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45 /* The functions should get the same stack-frame, and best way to make it
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46 reasonably sure is to make them have the same contents (regarding the
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47 n tests). */
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48
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49 static void __attribute__((noinline)) ATTR
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50 recurser_void1 (void)
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51 {
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52 if (n == 0 || n == 7 || n == 8)
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53 track ();
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54
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55 if (n == 10)
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56 return;
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57 n++;
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58 recurser_void2 ();
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59 }
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60
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61 static void __attribute__((noinline)) ATTR
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62 recurser_void2 (void)
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63 {
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64 if (n == 0 || n == 7 || n == 8)
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65 track ();
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66
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67 if (n == 10)
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68 return;
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69 n++;
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70 v++;
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71 recurser_void1 ();
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72 }
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73
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74 void *trackpoint;
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75
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76 void __attribute__ ((noinline))
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77 track ()
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78 {
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79 char stackpos[1];
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80
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81 if (n == 0)
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82 trackpoint = stackpos;
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83 else if ((n != 7 && n != 8) || trackpoint != stackpos)
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84 abort ();
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85 }
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