Author: Vincent Diepeveen
Date: 05:13:09 08/07/03
Hello, exactly this i had noticed too. not the solution though. perhaps some of you might get helped by it for your software in case you use intel c++: ----------- Name: redpriest (redpriest@alum.wpi.edu) 8/5/03 ...but it isn't really. Sometimes it produces correct results. It just needs you to look at the results and ensure they are correct, disable if necessary. There is definite proof of what *can* happen. I built a ScienceMark binary and the results were seemingly impressive.... until I checked the results. They were completely incorrect. A possible issue here is that the Intel compiler has the /Op option OFF by default. With this off, fp results are much faster but they lose precision and generate weird errors further down the line. This happened to me. With /Op on, the compiler was no faster than say, the MSVC 6.0 SP5 compiler with /Op on. /Op appears to be the *default* setting for the Microsoft compiler. /Op off appears to be the *default* setting for the Intel C compiler. Also, some of those fp functions are ANSI C-compatible are broken when inlining is enabled... It's not cheating but it's very misleading. ALWAYS, ALWAYS check the results before getting too excited... David Kanter (dkanter@realworldtech.com) on 8/4/03 wrote: --------------------------- >There is no such proof there. We have person X saying that Intel's compiler deliberately >uses imprecise representations. > >I do not see any examples; I would want to see multiple ones. Perhaps a program >compiled with ICC that does such manipulations displaying the result at the end of each step. > >I have yet to see anything "proving" that Intel's compilers cheat. I have however >heard several people say that it is not the best for some sorts of code. > >David > > >Suki (323@yahoo.com) on 8/4/03 wrote: >--------------------------- >>Proof in this thread >> >>http://www.aceshardware.com/forum?read=105028264 >
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