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| Rev 301 |
Rev 338 |
// { dg-do run }
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// { dg-do run }
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/* { dg-options "-O2" } */
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/* { dg-options "-O2" } */
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// We used to get alias grouping wrong on this one, hoisting accesses
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// We used to get alias grouping wrong on this one, hoisting accesses
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// to the vector's end out of the loop.
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// to the vector's end out of the loop.
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#include
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#include
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#include
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#include
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struct A
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struct A
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{
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{
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double unused; // If I remove it => it works.
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double unused; // If I remove it => it works.
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std::vector v;
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std::vector v;
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A() : v(1) {}
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A() : v(1) {}
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};
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};
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inline // If not inline => it works.
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inline // If not inline => it works.
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A g()
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A g()
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{
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{
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A r;
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A r;
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r.v.resize(2);
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r.v.resize(2);
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r.v[0] = 1;
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r.v[0] = 1;
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while (!r.v.empty() && r.v.back() == 0)
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while (!r.v.empty() && r.v.back() == 0)
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r.v.pop_back();
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r.v.pop_back();
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return r;
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return r;
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}
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}
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A f(const A &a)
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A f(const A &a)
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{
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{
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if (a.v.empty()) return a;
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if (a.v.empty()) return a;
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if (a.v.empty()) return a;
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if (a.v.empty()) return a;
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// A z = g(); return z; // If I return like this => it works.
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// A z = g(); return z; // If I return like this => it works.
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return g();
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return g();
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}
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}
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int main()
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int main()
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{
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{
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A a;
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A a;
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A b;
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A b;
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A r = f(a);
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A r = f(a);
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assert(r.v.size() != 0);
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assert(r.v.size() != 0);
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return 0;
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return 0;
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}
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}
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