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Subject: Re: what is the meaning of RESTRICT in crafty?

Author: Anthony Cozzie

Date: 11:25:02 12/17/03

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On December 17, 2003 at 14:22:22, Uri Blass wrote:

>I find that a lot of functions in Craftyget as a parameter TREE* RESTRICT
>
>What is the meaning of the RESTRICT word?
>
>I looked for that word in Crafty and except cases when Crafty get that parameter
>in functions
>I could only find in chess.h the following lines that I also do not understand.
>
>#if defined (_MSC_VER) && (_MSC_VER >= 1300) && (!defined(_M_IX86) || (_MSC_VER
>>= 1400))
>#  define RESTRICT __restrict
>#else
>#  define RESTRICT
>#endif
>
>
>Uri

restrict means an unaliased pointer. e.g.

void vectoradd(double *a, double *b, double *c, int len)
{
  for(int i = 0; i < len; i++)
    c[i] = b[i] + a[i];
}

the compiler doesn't know that a != b != c unless you use __restrict or specify
it as a command line option.

anthony



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