[fpc-pascal] Optimisation : X+X or 2*X or X*2 ?

[Philippe]

forgot 

X shl 1 

normaly the fastest ... 

Em 19.01.2014 17:47,
Ched escreveu: 

> Dear Freepascalers,
> 
> The multiplication in
floating arthmetic units is usualy know as being slower than the
addition. So, have 
> I interest to code X+X, 2*X or X*2 when using
reals (mainly double and extended) ?And with integers ?
> 
> Can the
compiler optimise this operation choosing the fastest one - probably
depending on the 
> architecture x86, arm, aso.
> 
> Cheers, Raoul
>
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