[Bug libc/13753] [2.15 backport] Really fix AVX tests

["carlos_odonell at mentor dot com" <sourceware-bugzilla@sourceware.org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=13753

--- Comment #7 from Carlos O'Donell <carlos_odonell at mentor dot com> 2012-05-10 22:20:58 UTC ---
(In reply to comment #6)
> @Jeff: I have access to a Xen system to test these issues, so if you post a
> link to the patch I can test.
> 
> Note that with the two original patches I still get issues in strcasecmp() with
> illegal instructions with AVX:
> 
> #0  0x00007ffff76cd0ff in __strcasecmp_l_avx () from ./lib/libc.so.6
> 
>    0x00007ffff76cd0f7 <+23>:    and    $0x3f,%rcx
>    0x00007ffff76cd0fb <+27>:    and    $0x3f,%rax
> => 0x00007ffff76cd0ff <+31>:    vmovdqa 0x46979(%rip),%xmm4        #
> 0x7ffff7713a80
>    0x00007ffff76cd107 <+39>:    vmovdqa 0x469a1(%rip),%xmm5        #
> 0x7ffff7713ab0
>    0x00007ffff76cd10f <+47>:    vmovdqa 0x46989(%rip),%xmm6        #
> 0x7ffff7713aa0
> 
> I will test with the additional patches linked in this bug report.
> 
> 
> BTW, just to confirm how this should be done, the intel manual [1] states:
> 1) Detect CPUID.1:ECX.OSXSAVE[bit 27] = 1 (XGETBV enabled for application use1)
> 2) Issue XGETBV and verify that XCR0[2:1] = ‘11b’ (XMM state and YMM state are
> enabled by OS).
> 3) detect CPUID.1:ECX.AVX[bit 28] = 1 (AVX instructions supported).
> (Step 3 can be done in any order relative to 1 and 2)
> 
> http://www.intel.com/content/www/us/en/architecture-and-technology/64-ia-32-architectures-software-developer-manual-325462-rmver.html
> - section 13.5

Can you test this?
http://sourceware.org/ml/libc-alpha/2012-05/msg00607.html

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