tree e43d3b84882fbac5b53ee20796d9c9a0070ab87d
parent b3e411e48164cda6913b659128549858b6f69ba3
author James Zern <jzern@google.com> 1429928513 -0700
committer James Zern <jzern@google.com> 1429928654 -0700

x86_simd_caps: check max cpuid before testing AVX2

structured extended feature flags require eax = 7; avoids incorrectly
detecting avx2 on some older processors that support avx.

from [1]:
INPUT EAX = 0: Returns CPUID’s Highest Value for Basic Processor
Information and the Vendor Identification String

[1] http://www.intel.com/content/www/us/en/processors/processor-identification-cpuid-instruction-note.html

Change-Id: I6b4735b5f7b7729a815e428fca767d1e5a10bcab