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Date: Fri, 18 Jan 2008 16:41:19 +0100 (CET)
From: Michael Matz <matz@suse.de>
Subject: Re: [Qemu-devel] Re: [PATCH 1/5] Fix i386 Host
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To: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Cc: consul@collegeclub.com, qemu-devel@nongnu.org, Alexander Graf <agraf@suse.de>

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Hi,

On Fri, 18 Jan 2008, Johannes Schindelin wrote:

> > Well, I can tell you why, but it doesn't help you: the 3.4.2 compiler=
=20
> > has different deficiencies in reload than the 4.x line of compilers. =
=20
> > To make the whole thingy work on all compilers trying and testing is=20
> > required to avoid all these different deficiencies.  My patch is=20
> > partly real bug fixes (the "q" constraint part for instance) and=20
> > partly changes helping to lessen the register pressure which reload=20
> > needs to fix (the %ecx thingy for instance).  Both of these might=20
> > expose the bugs in 3.4.2, in which case we need to hack around those=20
> > as well.  That's what I tried to do with the patch from=20
> > http://article.gmane.org/gmane.comp.emulators.qemu/22762 , but it=20
> > needs of course testing by someone who actually uses 3.4.2.
>=20
> I just downloaded it, and tested it on MinGW with 3.4.2, and I still ge=
t=20
> the "can't find register in class `Q_REGS=C2=B4 while reloading `asm=C2=
=B4" error.

Bummer.  As a test of theory (I'm not proposing this as patch), can you=20
see what happens if you make vtmp volatile, i.e. make it look like so ? :

#if DATA_SIZE =3D=3D 1 || DATA_SIZE =3D=3D 2
    volatile RES_TYPE vtmp =3D v;
#endif

Bah, remote work-arounding of reload sucks :-)


Ciao,
Michael.
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