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111
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1 // PR c++/27768
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2 // Alias grouping was losing some may_aliases, causing us to think
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3 // the store to w.p was dead.
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4
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5 // { dg-do run }
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6 // { dg-options "-O2" }
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7
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8 int N = 1;
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9
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10 struct VA
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11 {
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12 int *p, *q, *r;
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13
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14 VA() : p(), q() {}
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15 VA(const VA&) : p(), q() {}
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16 ~VA() { if (p) --N; }
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17 };
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18
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19 inline void foo(VA, VA, VA) {}
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20
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21 struct VB
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22 {
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23 VA va;
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24
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25 VB() {}
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26
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27 VB(const VB&)
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28 {
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29 va.p = new int(va.q - va.p);
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30 va.r = va.p + (va.q - va.p);
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31 foo(va, va, va);
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32 }
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33 };
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34
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35 struct VC : VB { char c; };
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36 struct V : VC {};
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37
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38 struct WA
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39 {
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40 struct X {};
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41 X **p, **q, **r;
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42
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43 WA() : p() {}
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44 ~WA() { if (p) --N; }
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45 };
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46
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47 struct W : WA {};
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48
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49 int main()
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50 {
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51 {
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52 V v, u(v);
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53 W w;
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54 }
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55 return N;
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56 }
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