From: Ludovic Drolez <ldrolez@linbox.com>
To: qemu-devel@nongnu.org
Subject: [Qemu-devel] Re: [BUG] QEMU x86_64 SSE bug in modf() + MMX bug
Date: Tue, 16 Jan 2007 12:22:36 +0100 [thread overview]
Message-ID: <45ACB57C.4090304@linbox.com> (raw)
In-Reply-To: <200701151416.03608.jseward@acm.org>
Julian Seward wrote:
>>>Would someone be able to track down this SSE QEMU bug seen only in SLES's
>>>modf() function ?
>
>
> The Valgrind sources contain test programs, including expected outputs,
> for all SSE/SSE2/SSE3 instructions on amd64 (see none/tests/amd64/insn-sse
> and insn-sse2). Running those on QEMU might be a quick and easy first
> check for something wrong in the SSE department. They are not completely
> comprehensive but may find obvious arithmetic errors and instruction
> decoding errors.
>
Hi !
I've run the valgrind tests on Qemu 0.8.2, in particular insn_basic, insn_fpu,
_mmx, _sse, _sse2. No bugs were found in SSE and FPU emulation, but one was
found in MMX !:
~/tests/none/tests/amd64 # diff insn_mmx.r insn_mmx.stdout.exp
1,6c1,2
< movd_1 ... not ok
< result0.sd[0] = 1234 (expected 1234)
< result0.sd[1] = 0 (expected 5678)
< movd_2 ... not ok
< result0.sd[0] = 1234 (expected 1234)
< result0.sd[1] = 0 (expected 5678)
---
> movd_1 ... ok
> movd_2 ... ok
Which comes from the following test:
#
# %mm <-> ireg64
#
movd mm.sd[1234,5678] r64.sd[1111,2222] => 1.sd[1234,5678]
movd r64.sd[1234,5678] mm.sd[1111,2222] => 1.sd[1234,5678]
So one MMX bug when using 64 bits regs has been found, but the SSE2 bug is
still a mystery :-(
Cheers,
--
Ludovic DROLEZ Linbox / Free&ALter Soft
www.linbox.com www.linbox.org tel: +33 3 87 50 87 90
152 rue de Grigy - Technopole Metz 2000 57070 METZ
next prev parent reply other threads:[~2007-01-16 11:22 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-15 10:18 [Qemu-devel] [BUG] QEMU x86_64 SSE bug in modf() Ludovic Drolez
2007-01-15 11:54 ` Carlo Marcelo Arenas Belon
2007-01-15 14:00 ` [Qemu-devel] " Ludovic Drolez
2007-01-15 14:16 ` [Qemu-devel] " Julian Seward
2007-01-16 11:22 ` Ludovic Drolez [this message]
2007-01-16 16:19 ` [Qemu-devel] Re: [BUG] QEMU x86_64 SSE bug in modf() + MMX bug Ludovic Drolez
2007-01-16 17:50 ` Aurelien Jarno
2007-01-15 12:02 ` [Qemu-devel] [BUG] QEMU x86_64 SSE bug in modf() Thiemo Seufer
2007-01-15 13:54 ` Ludovic Drolez
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