Compiler optimization causing program to run slower

Question

I have the following piece of code that I wrote in C. Its fairly simple as it just right bit-shifts x for every loop of for.

int main() {
   int         


        

Answer 1

Additional information about why integer overflows are undefined can be found here:

http://blog.llvm.org/2011/05/what-every-c-programmer-should-know.html

Search for the paragraph "Signed integer overflow".