usingSystem;usingSystem.Diagnostics;classProgram{staticlongdiv,rem,a,b;staticvoidMain(){// Various sets of a/b inputsvarpairs=new[]{Tuple.Create<long,long>(0,1),Tuple.Create<long,long>(4,2),Tuple.Create<long,long>(99,10),Tuple.Create<long,long>(-99,-10),Tuple.Create<long,long>(-99,10),Tuple.Create<long,long>(4,12),Tuple.Create<long,long>(1,long.MaxValue),Tuple.Create<long,long>(long.MaxValue,1),Tuple.Create<long,long>(long.MaxValue,3),Tuple.Create<long,long>(long.MaxValue,long.MaxValue-1),};constintIters=50000000;// Time the old and the new on each inputvarsw=newStopwatch();foreach(Tuple<long,long>tinpairs){a=t.Item1;b=t.Item2;sw.Restart();for(inti=0;i<Iters;i++)div=DivRem_Old(a,b,outrem);sw.Stop();TimeSpanoldTime=sw.Elapsed;sw.Restart();for(inti=0;i<Iters;i++)div=DivRem_New(a,b,outrem);sw.Stop();TimeSpannewTime=sw.Elapsed;Console.WriteLine($"Old:{oldTime} New:{newTime}");}}publicstaticlongDivRem_Old(longa,longb,outlongresult){result=a%b;returna/b;}publicstaticlongDivRem_New(longa,longb,outlongresult){longdiv=a/b;result=a-(div*b);returndiv;}}

> corerun divremtest.exeOld: 00:00:01.0659336 New: 00:00:00.5490556Old: 00:00:01.0559024 New: 00:00:00.5516266Old: 00:00:01.0675624 New: 00:00:00.5485116Old: 00:00:01.0537601 New: 00:00:00.5483118Old: 00:00:01.0612407 New: 00:00:00.5526581Old: 00:00:01.0874783 New: 00:00:00.5545691Old: 00:00:01.1375759 New: 00:00:00.5528239Old: 00:00:01.0875608 New: 00:00:00.5720249Old: 00:00:01.1346930 New: 00:00:00.6171032Old: 00:00:01.1621859 New: 00:00:00.5689636