RE: [Dev-C++] #DEFINE versus cont variables in array inicializations

[Ioannis V. <iv...@em...>]

> -----Original Message-----
> From: Per Westermark [mailto:pw...@ia...] 
> Sent: Friday, May 30, 2003 2:00 AM
> To: Ioannis Vranos
> Cc: Dev-C++ Mailing List
> Subject: RE: [Dev-C++] #DEFINE versus cont variables in array 
> inicializations
> 
> 
> I guess you don't think of gcc as a decent compiler then.
> 
> try gcc -O3 -S on the code below and look at the output.
>   4 byte for the value 7
>   4 byte for the SIZE reference.
>   access loads SIZE and pushes [SIZE] (4 byte addr info + extra instr)
> 
> with const int SIZE = 7
>   zero byte for value
>   every access pushes 7 directly. (4 byte value)
> 
> Most compilers treat 'const int v = <value>' identical to #define XX
> <value>, i.e. optimal code is generated.



... and we are talking about C++ here, so g++ is the compiler and not gcc.



Ioannis Vranos
 
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