Re: test_x86_emulator

[Don Slutz <dslutz@verizon.com>]

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On 04/15/14 02:49, Jan Beulich wrote:
>>>> On 14.04.14 at 19:29, <dslutz@verizon.com> wrote:
>> It is more complex then it appears at 1st look.
>>
>> -O1:
>> ...
>> Testing movdqu (%edx),%xmm4...          okay
>> Testing vmovdqu %ymm2,(%ecx)...         skipped
>> Testing vmovdqu (%edx),%ymm4...         skipped
>> Testing movsd %xmm5,(%ecx)...           okay
>> Testing movaps (%edx),%xmm7...          okay
>> ...
>>
>> -O2:
>> ...
>> Testing movdqu (%edx),%xmm4...          okay
>> Testing vmovdqu %ymm2,(%ecx)...         failed!
>> make: *** [run] Error 1
> Now that's of course very interesting - looks more like a problem
> with test_x86_emulator.c's use of CPUID then (because you said
> you do this on an AVX-capable system, the -O1 test shouldn't skip
> these).
>
>> get_fpu (exception_callback=0x402a60 <fpu_handle_exception>,
>> exception_callback_arg=0x7fffffffd7d0,
>>       type=X86EMUL_FPU_ymm, ctxt=0x7fffffffdb80) at test_x86_emulator.c:138
>> 138         switch ( type )
>> (gdb) n
>> 137     {
>> (gdb)
>> 138         switch ( type )
>> (gdb)
>> 154         return X86EMUL_OKAY;
>> (gdb)
>> 138         switch ( type )
>> (gdb)
>> 152             return X86EMUL_UNHANDLEABLE;
>> (gdb)
>> 138         switch ( type )
>> (gdb)
>> 132     int get_fpu(
>> (gdb)
>> 155     }
> Or a code generation problem: An input of X86EMUL_FPU_ymm should
> obviously result in execution making to the respective case statement,
> yet the steps above lead directly to the default one.
>
> What gcc version are you using? And could you perhaps make both
> binaries (-O1 and -O2) available for inspection?

dcs-xen-54:~/xen/tools/tests/x86_emulator>gcc --version
gcc (GCC) 4.7.2 20120921 (Red Hat 4.7.2-2)

Attached are the binaries.

    -Don Slutz
> Jan
>


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