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111
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1 /* PR optimization/5844
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2 This testcase was miscompiled because of an rtx sharing bug. */
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3 /* { dg-do run } */
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4 /* { dg-options "-O2" } */
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5 /* { dg-options "-O2 -mtune=i586" { target { { i?86-*-* x86_64-*-* } && ia32 } } } */
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6 /* { dg-xfail-if "doesn't support self-referential initializers" { nvptx-*-* } } */
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7
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8 struct A
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9 {
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10 struct A *a;
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11 int b;
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12 };
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13
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14 struct B
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15 {
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16 struct A *c;
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17 unsigned int d;
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18 };
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19
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20 struct A p = { &p, -1 };
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21 struct B q = { &p, 0 };
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22
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23 extern void abort (void);
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24 extern void exit (int);
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25
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26 struct B *
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27 foo (void)
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28 {
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29 return &q;
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30 }
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31
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32 void
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33 bar (void)
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34 {
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35 struct B *e = foo ();
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36 struct A *f = e->c;
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37 int g = f->b;
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38
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39 if (++g == 0)
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40 {
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41 e->d++;
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42 e->c = f->a;
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43 }
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44
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45 f->b = g;
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46 }
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47
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48 int
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49 main ()
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50 {
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51 bar ();
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52 if (p.b != 0 || q.d != 1 || q.c != &p)
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53 abort ();
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54 exit (0);
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55 }
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