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Re: [DotGNU]cscc::optimisation::literals

From: Rhys Weatherley
Subject: Re: [DotGNU]cscc::optimisation::literals
Date: Fri, 22 Mar 2002 13:32:45 +1000

Rhys Weatherley wrote:

> The first time you call the function, and while it is
> being converted to CVM bytecode, it will hash the
> literal and find the object.  This object reference is
> then embedded into the code.  Every subsequent
> call to the method will use the object directly,
> with no extra overhead.

My mistake - it does hash the object each time, but it
will not create a new object unless the string literal
has never been seen before.  I better fix this I suppose.

Anyway, it doesn't change my point - don't try to
second-guess the engine.  It's easier to optimise
cases like this in the engine, than in the pnetlib code.

Using a "static" field forces the system to always do
a lookup on the field.  Static fields are quite expensive
to access.  Once I optimise string literals some more,
it will be a simple "load pointer onto stack" operation,
which is much more efficient that a static field access.



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