On 2015.08.13 at 12:31 +0300, Yuri Rumyantsev wrote: > Hi All, > > Here is patch for adding march/mtune options for Skylake.
http://www.intel.com/content/dam/www/public/us/en/documents/specification-updates/desktop-6th-gen-core-family-spec-update.pdf states that BMI1 and BMI2 are not supported. Is this true for all Skylake CPUs? Quote from the pdf: SKD002 CPUID Incorrectly Reports Bit Manipulation Instructions Support Executing CPUID with EAX = 7 and ECX = 0 may return EBX with bits [3] and [8] set, incorrectly indicating the presence of BMI1 and BMI2 instruction set extensions. Attempting to use instructions from the BMI1 or BMI2 instruction set extensions will result in a #UD exception. -- Markus
