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111
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1 /* PR tree-optimization/33136 */
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2 /* { dg-do run } */
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3 /* { dg-options "-O2" } */
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4
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5 extern void abort (void);
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6
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7 struct S
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8 {
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9 void *a;
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10 int b;
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11 int *c;
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12 };
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13 static int d, e;
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14
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15 static struct S s;
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16
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17 static int *
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18 __attribute__((noinline, const))
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19 foo (void)
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20 {
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21 return &s.b;
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22 }
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23
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24 int *
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25 __attribute__((noinline))
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26 bar (int **f)
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27 {
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28 s.c = &d;
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29 *f = &e;
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30 /* As nothing ever takes the address of any int * field in struct S,
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31 the write to *f can't alias with the s.c field. */
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32 return s.c;
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33 }
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34
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35 int
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36 __attribute__((noinline))
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37 baz (int *x)
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38 {
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39 s.b = 1;
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40 *x = 4;
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41 /* Function foo takes address of an int field in struct S,
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42 so *x can alias with the s.b field (and it does in this testcase). */
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43 return s.b;
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44 }
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45
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46 int
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47 __attribute__((noinline))
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48 t (void)
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49 {
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50 int *f = (int *) 0;
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51 return 10 * (bar (&f) != &d) + baz (foo ());
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52 }
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53
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54 int
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55 main (void)
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56 {
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57 if (t () != 4)
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58 abort ();
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59 return 0;
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60 }
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