Potential bug in double_m operator==

[Georgios Bitzes]

Hi Matthias,

Have a look at the snippet below, it's producing strange output:
#include <Vc/Vc>

using namespace Vc;
int main() {
   double_m a(Vc::One);
   double_m b(Vc::Zero);
   std::cout << a << std::endl;
   std::cout << b << std::endl;
   std::cout << (a == b) << std::endl;
}

The output I get is:
m[1111]
m[0000]
1

Clearly, the two masks are not equal so the last line should be 0.. Could
you confirm if this is a bug?

Tested
with a1d8b9fc31060d870386613cc72319546c850b87,
f692ec56aa28204f2166571c5c30ec6cdcfaaecd,
both producing identical output.

Thanks,
Georgios
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