[LLVMbugs] [Bug 12719] New: cpuid.h

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Tue May 1 17:33:48 PDT 2012


             Bug #: 12719
           Summary: cpuid.h
           Product: clang
           Version: trunk
          Platform: Macintosh
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Headers
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: luc_j_bourhis at mac.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 8483
  --> http://llvm.org/bugs/attachment.cgi?id=8483
cpuid.h from gcc 4.4.4 on CentOS 6

Clang's cpuid.h is very crude compare to gcc's one (at least from version 4.4
onward as I haven't checked before that). The latter has code to test whether
cpuid is actually supported by the processor and perhaps more importantly it
provides a bunch of defines to help parsing the values returned in eax, ebx,
ecx and edx. Nothing stellar but it feels a bit stupid to have to parrot the
same code times and again. For your convenience, I have attached one such gcc's

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