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Re: [Qemu-devel] tcg problem running SPARC program on x86
From: |
rob1weld |
Subject: |
Re: [Qemu-devel] tcg problem running SPARC program on x86 |
Date: |
Mon, 13 Oct 2008 16:24:40 -0400 |
When I run the current trunk (revision 5478) with
"/usr/local/bin/qemu-system-mips -cpu 24Kc -M malta ..." I get a
similar error (calls tcg_abort() ) to the one described by Vince:
/build/qemu/trunk/tcg/tcg.c:1484: tcg fatal error
Aborted
If I use exactly the same command but use the "Lenny Debian GNU/Linux's
repository version" of qemu-system-mips (version 0.9.1-6)
the error does not occur. Thus, this error is occurring on the MIPS
platform (host x86) as well as the SPARC.
Rob
On 8/19/08, Blue Swirl <address@hidden> wrote:
On 8/18/08, Vince Weaver <address@hidden> wrote:
> Hello
>
> I'm continuing on my quest to get the SPEC2000 benchmarks running
under
> sparc32-linux-user (so far 8 out of 48 work).
>
> Many of the benchmarks die early on with the following error:
>
> /fusion/research4/vince/qemu/svn/tcg/tcg.c:1455: tcg fatal
error
>
> This error is caused when tcg_reg_alloc_mov() is called but
ts->val_type
> is equal to 0 (which is TEMP_VAL_DEAD). So maybe the optimizer is
> optimizing away something that it shouldn't?
>
> This happens in a block with multiple calls to the SPARC "mulscc"
> instruction which is a complicated instruction, so maybe this is
finding an
> obscure corner case.
>
> I've attached a very small sample program that exhibits the bug
when run
> with ./sparc32-linux-user/qemu-sparc32plus
Okay, I can finally reproduce this. Strangely it does not occur if -d
flag is used and "op" is one of the log items. I have to check if
older reports where I could not reproduce the bug were suffering from
the same problem.
But I haven't found any fix yet.
I have isolated the problem to andi op. The attached patch makes the
bug go away by disabling the offending andi, but it's of course not a
real fix. Why andi fails with op flag enabled, I have no idea.
- Re: [Qemu-devel] tcg problem running SPARC program on x86,
rob1weld <=