double « Cast « C Q&A

1. Fast double -> short conversion with clamping using SSE?    stackoverflow.com

Is there a fast way to cast double values to shorts (16 bits signed), currently I'm doing something like this:

double  dval = <sum junk>
int16_t sval;
if (val > int16_max) { 
 ...

2. Performance difference with casting to double and increment    stackoverflow.com

I'm incrementing a counter, which I will need to use after the loop in double arithmetic. So, which would you expect to be faster? (Or too close to call?) Code 1:

double dubs ...

3. HPUX Invalid Address Alignment when assigning double, casting to same type works?    bytes.com

Hello, I am running into an invalid address alignment error on an HPUX box when I attempt to lookup a value in a STL map. The argument being passed in is a double, which is accessed from a structure; the map's key is also a double. The issue seemed to be occuring in the map's default comparison function so I implemented ...

4. Rounding error when casting double to short    cboard.cprogramming.com