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From "Nathan Beyer" <ndbe...@apache.org>
Subject Re: problem under windows
Date Fri, 25 May 2007 02:58:24 GMT
BTW - I do have P3 machines for testing. One's running W2K and the
other's running Ubuntu.

-Nathan

On 5/24/07, Elford, Chris L <chris.l.elford@intel.com> wrote:
> FYI, I have created http://issues.apache.org/jira/browse/HARMONY-3961
> To reflect this desired behavior.
>
> Regards,
> Chris Elford
> Intel SSG/Enterprise Solutions Software Division
>
> -----Original Message-----
> From: Elford, Chris L [mailto:chris.l.elford@intel.com]
> Sent: Thursday, May 24, 2007 9:46 AM
> To: dev@harmony.apache.org
> Subject: RE: problem under windows
>
> Interesting.  Its good to hear that some thought has been given to P3
> class systems.  I would think /arch:SSE would be okay.  This would let
> us run on both P3s and Athlon (like the one that Michael was trying to
> run on) which support both MMX and SSE but not SSE2.
>
> Is there a compiler option that generates back-off MMX code on platforms
> that don't support SSE or SSE2 instructions?  If so, it would result in
> larger executables and might impact code locality but it might be a good
> tradeoff.
>
> Regards,
>
> Chris Elford
> Intel SSG/Enterprise Solutions Software Division
>
> -----Original Message-----
> From: Mikhail Fursov [mailto:mike.fursov@gmail.com]
> Sent: Thursday, May 24, 2007 2:12 AM
> To: dev@harmony.apache.org
> Subject: Re: problem under windows
>
> Well, it looks like we need to remove this line from jitrino.dll build
> configuration for 32bit platform.
>                 <compilerarg value="/arch:SSE2" />
>
> On 5/24/07, Mikhail Fursov <mike.fursov@gmail.com> wrote:
> >
> > On 5/24/07, Elford, Chris L <chris.l.elford@intel.com> wrote:
> > >
> > > Hi all,
> > >
> > >   I tracked down a system that has SSE but not SSE2 (a dual
> processor P3
> > > system).  For me, adding "-xe ii" to the ntsd command line let the
> > > debugger break in at the first chance exception.  It reports that
> what I
> > >
> > > believe is an SSE2 instruction does indeed happen during jitrino.dll
> > > startup.
> > >
> > > 01365fb0 f20f100520553901 movsd xmm0,qword ptr
> > > [jitrino!JIT_gc_start+0xd5810 (01395520)]
> > >
> > > Without jitrino symbol information ( e.g., a pdb file for
> jitrino.dll),
> > > its hard to tell what function is being executed (it is unlikely
> that it
> > > is JIT_gc_start.  It would be nice if the snapshot builds included
> > > symbol files to help make for more meaningful stack traces.
> > >
> > > It may be good to discuss [again?] on the lists whether more people
> can
> > > come into the project to help create legacy modes that earlier
> > > instruction sets (and earlier Oses) can still execute without
> crippling
> > > current instruction set processors (and/or OSes).
> > >
> > > I don't see an open JIRA about this one.  The closest I see is
> > > http://issues.apache.org/jira/browse/HARMONY-3246 which is more
> about
> > > code that the JIT creates rather than the JIT itself.
> > >
> > > Ntsd log below showing more detail around faulting instruction.
> > > Mikhail?
> >
> >
> > You're right that we fixed Jitrino.OPT to generate SSE independent
> code
> > (use x87) if SSE2 is not available.
> > Another JIRA (not commited yet):
> http://issues.apache.org/jira/browse/HARMONY-3737
> > makes JET to compile all methods without FPU insts (>90% of methods)
> and
> > pass other methods to OPT
> > I checked dumpbin /disasm for jitrino.dll and see a lot of SSE/SSE2
> insts
> > in code.
> >
> > It's possible that our compiler options for jitrino.dll are too
> > aggressive. I will check it and report.
> >
> > --
> > Mikhail Fursov
>
>
>
>
> --
> Mikhail Fursov
>

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