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RE: [Bug-gnubg] gnubg on amd64 architecture

From: Jonathan Kinsey
Subject: RE: [Bug-gnubg] gnubg on amd64 architecture
Date: Tue, 13 Feb 2007 10:42:53 +0000

From: Jim Segrave <address@hidden>

I just got a new laptop with an Intel Core2 Duo and tried building
gnubg there (gentoo Linux as FreeBSD can't currently support the
Radeon graphics chip nor the Intel sound chip :-(( )

I have a fix for the sse tests in neuralnet.c, which otherwise don't
compile (pushfl is not valid on this architecture, pushf pushes a 64
bit value, so the pop's must become popq's to 64 bit
registers). What's the best way of setting a #define so that
neuralnet.c can choose which assembler code to generate for 32 bit and
64 bit machines? #define ATHLON perhaps?

As a side note, when it wouldn't compile and before I found the AMD
instruction set documents, I tried building it with the -march=sse2
and -DUSE_SSE_VECTORIZE flags omitted (on a fresh fetch from cvs), yet
conf.h still had #define USE_SSE_VECTORISE 1, so the compile still
failed. What's the correct way of suppressing the sse code?

>From brief testing, the results of analysing a match with a CLI
invocation of gnubg gives virtually identical results as I was getting
on my 686 machine, so it looks like the sse code is working.

However, in GUI mode, it is segfaulting in RenderBoard, I think because
nStride is -324, which in turn appears to be because nSize is
-1. Anyone know what's happening here? It's not 3d related, as a
rebuild --without-board3d behaves the same way.

A stack trace would be handy, you might want to look at the value of nSize.
It might be an idea to do a cli build first to get things going.

I'm going to check in a couple of small changes tonight which may well effect the multi-threaded code on 64bit, so you will want to get that later.

* Just remembered a crash I got the other day, when the direction of play was swapped, didn't get time to track it down but may be the problem you have.


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