I was asking you for some examples ..as i dont have any knowledge regarding this assembly code and how to study it .
there was no intention of mine to challenge you or disregard you . On 11/22/10, Gene <gene.ress...@gmail.com> wrote: > I'm not sure what you mean by support. > > If you mean examples, gcc uses several of the techniques I mentioned. > Write some switch statements with different distributions of cases. > Compile with -S, and inspect the assembly code. If you don't now how > to do that, take the time to learn. > > If you mean justify the truth of what I wrote, it's observation while > studying and teaching courses about compilers on and off for over 15 > years and building some myself. > > BTW, u c I won't ansr mor ??s if wrds arnt spld out... > > > On Nov 22, 12:28 am, LALIT SHARMA <lks.ru...@gmail.com> wrote: >> @dipankar.... >> >> Can u tell us , sumthng more in support of ur ans...?? >> >> On Mon, Nov 22, 2010 at 10:40 AM, DIPANKAR DUTTA >> >> <dutta.dipanka...@gmail.com> wrote: >> > both are same .. because any good optimizing compiler generate same >> > assembly >> > code of them... >> >> > On Mon, Nov 22, 2010 at 9:38 AM, Gene <gene.ress...@gmail.com> wrote: >> >> >> A good compiler will never generate a switch that is slower than an >> >> if...else chain. It will analyze the switch cases and pick one of >> >> several options for code generation. These may include cascaded >> >> conditional jumps (like if...else code), simple jump tables, segmented >> >> jump tables (cascaded jumps pick one of several jump tables because a >> >> single table would be too big), binary searches in a sorted table of >> >> case values, and perfect hash functions. These are the ones I've >> >> seen. There may be others. >> >> >> On Nov 21, 8:15 am, shiva <shivanand.kadwad...@gmail.com> wrote: >> >> > As per my understanding it is compiler depending thing.. >> >> >> > what i feel is switch need to evaluate the expression only once but >> >> > if >> >> > else if need to evaluate the expression more than once(what if >> >> > expression stored in variable and then compare...) >> >> >> > Does any one please comment difference in speed of switch and if >> >> > depending on how it is implemented... >> >> >> > I heard switch uses jump table for its operation. >> >> >> -- >> >> You received this message because you are subscribed to the Google >> >> Groups >> >> "Algorithm Geeks" group. >> >> To post to this group, send email to algoge...@googlegroups.com. >> >> To unsubscribe from this group, send email to >> >> algogeeks+unsubscr...@googlegroups.com. >> >> For more options, visit this group at >> >>http://groups.google.com/group/algogeeks?hl=en. >> >> > -- >> > DIPANKAR DUTTA >> > M-TECH,Computer Science & Engg. >> > E&C Dept,IIT ROORKEE >> > Uttarakhand , India – 247667 >> > ------------------------------------------- >> > website:http://people.iitr.ernet.in/shp/09535009/Website/index.html >> > ph no-09045809987 >> > email:dipan...@iitr.ernet.in >> >> > -- >> > You received this message because you are subscribed to the Google >> > Groups >> > "Algorithm Geeks" group. >> > To post to this group, send email to algoge...@googlegroups.com. >> > To unsubscribe from this group, send email to >> > algogeeks+unsubscr...@googlegroups.com. >> > For more options, visit this group at >> >http://groups.google.com/group/algogeeks?hl=en. >> >> -- >> Lalit Kishore Sharma >> IIIT Allahabad (Amethi Capmus) >> 5th Sem > > -- > You received this message because you are subscribed to the Google Groups > "Algorithm Geeks" group. > To post to this group, send email to algoge...@googlegroups.com. > To unsubscribe from this group, send email to > algogeeks+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/algogeeks?hl=en. > > -- Lalit Kishore Sharma IIIT Allahabad (Amethi Capmus) 5th Sem -- You received this message because you are subscribed to the Google Groups "Algorithm Geeks" group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en.
