Author: Brian Richardson
Date: 10:21:33 02/06/03
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On February 04, 2003 at 11:37:52, Dann Corbit wrote: >On February 04, 2003 at 11:19:06, David Rasmussen wrote: > >>When at last the long-awaited 64-bit processors from AMD and Intel are hitting >>the market in relevant quantities later this year, how is the compiler >>situation? I mean, to take advantage of such new architectures, you have to have >>a good compiler. It is certain that the first generation compilers for these >>processors won't be as good as those to come. But are there already compilers >>available for these processors (I think gcc is ready for both), and in what >>condition are they in? Can we expect to just go out and buy a Hammer processer >>later this year, go home and compile with our newly updated compiler from Intel, >>Microsoft or GNU etc. and then have blazingly fast 64-bit performance or what? >>Does anybody have some real experience? > >The 64 bit compilers for Intel chips are already available. In fact, I have had >64 bit Intel compilers for over a year now. > >Of course, they are going to improve over time. > >We don't do much real development in 64 bit architectures other than UNIX right >now (however) since there is no market yet. I have a test dual Itanium2 server. As of right now, Microsoft does not support an "integrated" compiler with the Visual Studio environment. It does from command line interfaces and Intel's compiler is also supported this way. Early performance tests are not encouraging vs AMD for computer chess application workloads, although I have not used Intel's profiler, nor tried Microsoft's compiler, yet. The current non-integrated environment is difficult to deal with (for me). I can say that raw x86 binaries only run at about 40% of the speed of a 2GHz x86. Intel's IA-64 compiler improves things to be about equal (without profiling). Have not been able to get all the PATH and environment setting just right yet to test Microsoft's optimizing compiler, but clearly performance on IA-64 is heavily dependent upon the compiler. There is a reason Dell skipped McKinley. Brian
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