SSE y SSE2

[Pedro Castro]

I wanted to personalize my program depending on the computer in which plays, be INTEL or AMD

The Pentium 4, it has instructions SSE and SSE2, if when compiling I say that uses SSE2 it plays worse than with the option for defect, with SSE it seems to play equally.

The AMD that I have has instructions SSE, SSE2 and SSE3, but it happens the same thing, if I use SSE2 it plays worse.

Does the code have to be prepared to use this instructions?

I use Visualc++ 2005 express, one can make some personalization depending of if it is the processor INTEL or AMD ?

I have the impression that my program plays worse in tourney with processors AMD64.

Best,

Pedro

[Gerd Isenberg]

Hi Pedro,

Agner Fog has a library for different compiler and os with eg.

Code: Select all

int InstructionSet (void);


to look whether the current processor as well the os supports SSE or SSE2, etc. http://www.agner.org/optimize/#manuals Subroutine library.

SSE is used under w64 for regular float/double instructions, most likely not important for chess. Intel C has some vectorize optimization options to use SSE2/3 integer-vector instructions. You can use SSE2/3 explicitly by instrinsics for various compilers, here the msdn aspx-site: http://msdn2.microsoft.com/en-us/library/y0dh78ez.aspx
Hope that helps

Gerd