https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99704

            Bug ID: 99704
           Summary: volatile is needed on asm statements in <cpuid.h>
           Product: gcc
           Version: 9.3.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hjl.tools at gmail dot com
                CC: crazylht at gmail dot com, ubizjak at gmail dot com
  Target Milestone: ---
            Target: i386,x86-64

Since CPUID instruction may return different values on hybrid core.
volatile is needed on asm statements in <cpuid.h>.

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