title: 64 bit number support in CUDA
body: <p>I kind of found various opinions on this topic, so this is why I decided to ask here. My question is starting from what computing capability is int64_t supported on CUDA. I am running cuda 5 on a Quadro770M and the following code works without a problem, although I read that 64 bit unsigned are supported starting from compute capability 1.3. So what is the real answer to that question ? </p>
  
  <pre><code>__device__ void printBinary(int64_t a) {
      int bits[64];
      int i;
  
      for (i = 0; i &lt; 64; i++) {
          bits[63 - i] = (a &gt;&gt; i) &amp; 1; 
      }
  
      for (int i = 0; i &lt; 64; ++i) {
          cuPrintf("%d", bits[i]);
      }
      cuPrintf("\n");
      cuPrintf("%016llX", a);
  }
  </code></pre>