More optimizations...

As half a followup to my last post, I just tried to recompile all of the C/C++ code I've written on my system (and a few small projects I didn't) with -O3 -ftree-vectorizer-verbose=2 to see what it could actually vectorize.

The results were rather dismal. It optimized one loop that looked like this:

for(int x=0;x<mySize;x++) {
    t[x] = myItems[x];
}

And a bunch that were constant initialization like this:

for(int x=0;x<mySize;x++) {
    t[x] = 0;
}

There were also a couple more in my BitArray that had errors, but looked like I might be able to rewrite them to be vectorizable. Granted, you spend a lot of time in loops, so a few optimizations go a long way, but overall it looks like it has a hard time working with most code.