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...ith an explanation of how > you compiled them exactly (exact sequence of commands) both for gcc and LLVM. > > Ciao, Duncan. > Hi Ciao Thank you very much for your help and patience I want to check with you the compilation steps witout turn on any optimazation in both gcc and llvm : Fft_x.c The first program before the transformation Fft_dswp.c The second program after the transformation In gcc compiler I used the following steps --Before the transformation gcc –Wall fft_x.c –o samp -lm Time ./samp 0.544 the execution time before transformation --A...

> I would be happy if you give me an insight into what could have caused the > difference. No idea. Maybe you forgot to turn optimizations on when compiling? Otherwise you are going to have to send in your programs along with an explanation of how you compiled them exactly (exact sequence of commands) both for gcc and LLVM. Ciao, Duncan.

Duncan Sands <baldrick <at> free.fr> writes: > > Hi esraa, > > > i am using LLVM to execute two programs both of them was exactly > > similar but the difference was the first one is a sequential program > > has three functions. In the second program i am trying to execute it > > by giving each function to thread (three thread work in parallel way)