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
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