### maroonrk's blog

By maroonrk, history, 6 weeks ago,

What if your solution got TLE due to denormal numbers? Would you add if(val<eps)val=0 everywhere? Today I found a simpler fix: let's include #include <xmmintrin.h> and insert _MM_SET_FLUSH_ZERO_MODE(_MM_FLUSH_ZERO_ON); at the beginning of the main function.

Example Problem

TLE Submission

AC Submission

I confirmed this magic works on AtCoder, Codechef, Yandex, and, of course, on Codeforces.

Since it's written on the Wikipedia page, I won't be surprised if this is a well-known trick in some countries. However, I and my friends haven't heard of this, so it must be worth sharing.

Note that I know nothing about what exactly this snippet does, and I'm happy to hear from computer experts what the possible defects it has if such exist.

• +193

 » 6 weeks ago, # | ← Rev. 2 →   +67 It might be a little hard to remember, but you can actually manipulate mxcsr register yourself as below without including any additional headers to achieve the same effect. int main() { __builtin_ia32_ldmxcsr(__builtin_ia32_stmxcsr() | 0x8000); return 0; } 
 » 6 weeks ago, # |   -95 great content learnt a new thing
 » 6 weeks ago, # |   -89 so learn silently don't brag here