Re: [Qemu-devel] Re: [PATCH 1/5] Fix i386 Host

[Johannes Schindelin]

Hi,

On Fri, 18 Jan 2008, Michael Matz wrote:

> 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 has different deficiencies in reload than the 4.x line of 
> > > compilers.  To make the whole thingy work on all compilers trying 
> > > and testing is required to avoid all these different deficiencies.  
> > > My patch is partly real bug fixes (the "q" constraint part for 
> > > instance) and partly changes helping to lessen the register pressure 
> > > which reload needs to fix (the %ecx thingy for instance).  Both of 
> > > these might expose the bugs in 3.4.2, in which case we need to hack 
> > > around those as well.  That's what I tried to do with the patch from 
> > > http://article.gmane.org/gmane.comp.emulators.qemu/22762 , but it 
> > > needs of course testing by someone who actually uses 3.4.2.
> > 
> > I just downloaded it, and tested it on MinGW with 3.4.2, and I still 
> > get the "can't find register in class `Q_REGS´ while reloading `asm´" 
> > error.
> 
> Bummer.  As a test of theory (I'm not proposing this as patch), can you 
> see what happens if you make vtmp volatile, i.e. make it look like so ? :
> 
> #if DATA_SIZE == 1 || DATA_SIZE == 2
>     volatile RES_TYPE vtmp = v;
> #endif

Still no joy.  Exactly the same error.

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

Heh.  I am so looking forward to Fabrice's code generator, now that I know 
of it!

Ciao,
Dscho