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Message-ID: <409094D4.5070202@ompf.org>
Date: Thu, 29 Apr 2004 07:38:28 +0200
From: tbp <gcc AT ompf DOT org>
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To: cygwin AT cygwin DOT com, ford AT vss DOT fsi DOT com
Subject: Re: g++ 3.4.0 cygwin, codegen SSE & alignement issues
References: <408F2C65 DOT 4090804 AT ompf DOT org> <Pine DOT CYG DOT 4 DOT 58 DOT 0404281232440 DOT 5560 AT fordpc DOT vss DOT fsi DOT com>
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Brian Ford wrote:
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14776
I wonder how i've missed that one. My bugzilla-fu is weak.

> I'm working with Red Hat to resolve this issue right now.  The problem is
> that thread stacks are not always 16 byte aligned.  You could try the
> following hack if you need something right away and don't mind building
> your own Cygwin DLL.
Surely not, thanks a lot.

That will surely do wonders for the stack alignement issue, but there's 
another fold that i'm still unsure how to handle. Under some 
circumstances some *ps instructions are generated touching non local 
memory (put in .rdata with 4 byte alignement as pointed out by Ross Ridge):
objdump ...|grep ...
   404264:       xorps  0x43af84,%xmm4
   4062a7:       xorps  0x43b304,%xmm2
   40872a:       xorps  0x43b33c,%xmm2
   40ab83:       andps  0x43b8ec,%xmm0
   40c5ab:       xorps  0x43bbb0,%xmm0
   41dc47:       xorps  0x444358,%xmm2
   42b006:       xorps  0x43ad94,%xmm1

I guess i could try to track those constants and put them in their own 
section or something, but is there a proper fix in the work by someone 
knowledgeable?

Thanks for your time,
	tbp



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