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From: Tim Prince <tprince AT computer DOT org>
Reply-To: tprince AT computer DOT org
To: tromey AT redhat DOT com
Subject: Re: Object alignment, was: cygwin failures - assertion "!(addr & FLAGS)" failed:
Date: Sun, 5 May 2002 23:44:34 -0700
Cc: "Billinghurst, David (CRTS)" <David DOT Billinghurst AT riotinto DOT com>,
   <java AT gcc DOT gnu DOT org>, <cygwin AT cygwin DOT com>
References: <FAC87D7C874EAB46A847604DA4FD5A6403470E AT crtsmail DOT corp DOT riotinto DOT org> <20020506001833 DOT 617B12CA87 AT inet1 DOT ywave DOT com> <876621ev7v DOT fsf AT creche DOT redhat DOT com>
In-Reply-To: <876621ev7v.fsf@creche.redhat.com>
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Message-Id: <20020506064433.330FD2CC36@inet1.ywave.com>

On Sunday 05 May 2002 21:49, Tom Tromey wrote:
> >>>>> "Tim" == Tim Prince <tprince AT computer DOT org> writes:
>
> Tim> The binutils alignment parameter in coff-i386.c is set to 4-byte
> Tim> alignment.  4-byte alignment also is the default for gcc -Os, at
> Tim> least from gcc-3.1.  Cases have been produced where gcc-3.1
> Tim> failed to give 16-byte alignment even with -O2, unless
> Tim> -mpreferred-stack-boundary=4 was specified.
>
> Are you talking about only the alignment of the stack?  I don't think
> that should matter to libgcj.  There used to be one place where we
> stack-allocated an object, but I believe that now there aren't any.
> All that matters to us is the alignment of statically allocated
> object, and objects created by the GC.
>
> Tom
Stack alignment matters when you use <xmmintrin.h>.  I didn't take the 
question as being one where gcj and libgcj were to be built without regard to 
other consequences, although I'm surprised if gcj doesn't allocate anything 
on stack. Static objects are under the control of the alignment for which 
binutils is built, so you don't get 8-byte alignment of statics with the 
stock cygwin binutils build.
-- 
Tim Prince

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