Re: Optimizations in C/C++ code doing matrix multiplications

marjan.sterk@ijs.si (Marjan Sterk)
31 Mar 2002 23:32:00 -0500

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Related articles
Optimizations in C/C++ code doing matrix multiplications ele1@gmx.ch (H. Ellenberger) (2002-03-22)
Re: Optimizations in C/C++ code doing matrix multiplications ele1@gmx.ch (H. Ellenberger) (2002-03-31)
Re: Optimizations in C/C++ code doing matrix multiplications marjan.sterk@ijs.si (2002-03-31)
Re: Optimizations in C/C++ code doing matrix multiplications mark@marklacey.com (2002-04-06)
Re: Optimizations in C/C++ code doing matrix multiplications lars.gregersen@it.dk (2002-04-06)
Re: Optimizations in C/C++ code doing matrix multiplications terryg@qwest.net (Terry Greyzck) (2002-04-07)
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From: marjan.sterk@ijs.si (Marjan Sterk)
Newsgroups: comp.compilers
Date: 31 Mar 2002 23:32:00 -0500
Organization: Jozef Stefan Institute
References: 02-03-151
Keywords: C, optimize
Posted-Date: 31 Mar 2002 23:32:00 EST

On 22 Mar 2002 21:03:51 -0500, "H. Ellenberger" <ele1@gmx.ch> wrote:


>Which compilers are smart enough to automagically optimize this kind
>of data acess by introducing hidden pointer variables (in registers)
>incremented and thus avoiding most multiplications?


Visual C++ 6, for example. I tested a small loop program (not exactly
matrix mult.) - the speed was the same whether I used pointers or
simple indices. With optimization turned off, however, the pointer
version was about twice as fast as the simple version.

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