Author: Dann Corbit
Date: 16:22:08 02/24/01
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On February 24, 2001 at 16:54:56, Dan Newman wrote: >On February 24, 2001 at 00:22:09, Dann Corbit wrote: > >>On February 24, 2001 at 00:01:33, Dan Newman wrote: >>[snip] >>>Heh. I bought the Intel compiler (version 5.0) on the basis of reports of >>>better performance than MSVC, but on my program I get a 24% hit instead... >>>I imagine what may happen is that if you optimize for one compiler, you >>>end up doing worse on another. Generally I've found MSVC to be 20-30% >>>better than anything else I've tried (Watcom, gcc, Intel). >> >>Which brings up another point -- >>If you are thinking of buying this compiler, keep this in mind: >>1. It *requires* Microsoft C++ Professional or Enterprise edition >>2. You can try it out for free for one month. >> >>>(It could be that I just haven't found the right switches yet.) >>> >>>The Intel compiler did find a few minor "bugs" that have been slipping past >>>MSVC--got 4 warnings that really needed fixing--so it's not a total loss :). >> >>It does have some excellent diagnostics. I have found that running my code >>through as many compilers as possible as well as PC-Lint and LCLint will turn up >>little nagging things that need attention each time. >> >>For floating point performance, the Intel compiler really shines. It is >>sometimes twice as fast as any other in my possession. >>Try this code with your favorite compilers, and you will find that Intel crushes >>the opposition: >> ><snip code> > >I tried it, and it blew Watcom out of the water. And Watcom (the last I >tested it) was a bit faster on FP than MSVC. I guess I ought to try it >out on some of my old raytracing codes... You can also mix and max objects if you compile some with the MS compiler first. There are lots of benefits to the Intel compiler. I suspect tremendous competition like that will get MS hopping to improve theirs also.
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