[sp332]

The original is 1,287 bytes after removing comments and line endings where possible. After just a bit of search-and-replace to shrink variable names, I got the new one down to 2,373 bytes including the same error checking and output at the end. So 1.8 business cards, which is not too bad.

And no I haven't tried to compile it. https://pastebin.com/LDRd6U4e

[a1369209993]

Hmm, some further improvements:

  typedef float F;typedef int I;
  // saves 2 lines (but zero bytes)
  
  #define R return
  // OR
  #define O(S,A,R) operator S(A){return R;}
  
  #define E(F){E_((F||cudaPeekAtLastError)(),__FILE__,__LINE__);}

and so on - although you'd probably have to make semantic chages to get onto a single card. (Or use a smaller font, but that's presumably cheating.)

[sp332]

I feel like the self-timing and error-checking is unnecessary, and you can at least fit it on the front + back of a business card with enough room left for your name and an email address.