46 lines
993 B
C
46 lines
993 B
C
// PR c++/16405
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// { dg-options "-O2" }
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// { dg-do run }
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// There should be exactly one temporary generated for the code in "f"
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// below when optimizing -- for the result of "b + c". We have no
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// easy way of checking that directly, so we count the number of calls
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// to "memcpy", which is used on (some?) targets to copy temporaries.
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// If there is more than two calls (one for coping "*this" to "t", and
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// one for copying the temporary to "a"), then there are too many
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// temporaries.
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int i;
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extern "C"
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void *memcpy (void *dest, const void *src, __SIZE_TYPE__ n)
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{
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char *d = (char *) dest;
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const char *s = (const char *) src;
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while (n--)
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d[n] = s[n];
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++i;
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return dest;
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}
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struct T {
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int a[128];
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T &operator+=(T const &v) __attribute__((noinline));
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T operator+(T const &v) const { T t = *this; t += v; return t; }
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};
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T &T::operator+=(T const &v) {
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return *this;
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}
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T a, b, c;
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void f() { a = b + c; }
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int main () {
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i = 0;
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f();
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if (i > 2)
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return 1;
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}
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