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inline double abs(double x)
{
// remove sign bit
*reinterpret_cast<long long int*>(&x) &= 0x7FFFFFFFFFFFFFFFLL;
return x;
}
int main(int argc, char *argv[])
{
std::cout << "abs = " << abs(-2.1) << std::endl;
}
This simple code works correct in DEBUG. But it works INCORRECT in
release (-O2)
gcc 4.1.2/4.1.1
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