Message-Id: <m0zniWD-000S5EC@inti.gov.ar>
Comments: Authenticated sender is <salvador AT natacha DOT inti DOT gov DOT ar>
From: "Salvador Eduardo Tropea (SET)" <salvador AT inti DOT gov DOT ar>
Organization: INTI
To: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>, djgpp AT delorie DOT com,
        Arthur <arfa AT clara DOT net>, djgpp AT delorie DOT com
Date: Wed, 9 Dec 1998 09:23:46 +0000
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Subject: RE: [Announce] Benchmarks result tested with gcc, egcs and pgcc 
References: <m0zn3T4-000S5eC AT inti DOT gov DOT ar>
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Reply-To: djgpp AT delorie DOT com

Eli Zaretskii <eliz AT is DOT elta DOT co DOT il> wrote:
 
> On Mon, 7 Dec 1998, Salvador Eduardo Tropea (SET) wrote:
> 
> > In some days I'll upload a new table using geometric average, that's a little 
> > bit better for comparisson in this case (can be much better in other cases).
> 
> What is especially significant is that, while the average performance is 
> almost identical, there's some very large (40% or more!) 

Yes that's clear in the graphic that contains all. 

> differences in 
> several individual tests.  It would be interesting to know whether these 
> tests have any practical implications (e.g., it might be that those tests 
> use code which will rarely happen in real-world programs).

All the algorithms are real-world ones. They are just very well known 
algorithms. Some of them are floating point intensive, others are pure 
integer. All are relative complex and messure the CPU and compiler.

> If the tests are of practical importance, I think it would be interesting
> to know what are the cases where GCC-generated code is much slower than
> Watcom's, and vice versa.  From time to time, people ask here questions 
> about relative performance, and all we usually tell them is ``almost 
> identical''.

Lamentably I don't have a Watcom compiler to see the assembler generated (I 
don't want to disassemble a huge EXE ;-). But if somebody can make it we can 
learn a lot looking at the routines that Watcom optimizes better.
But perhaps we can't get the best of both because the 
differences are in different trade-offs in the design of the optimizer.  

SET
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