[llvm-bugs] [Bug 46292] New: [X86] -march=native doesn't work on non-Intel/AMD CPUs

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https://bugs.llvm.org/show_bug.cgi?id=46292

            Bug ID: 46292
           Summary: [X86] -march=native doesn't work on non-Intel/AMD CPUs
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: craig.topper at gmail.com
                CC: craig.topper at gmail.com, llvm-bugs at lists.llvm.org,
                    llvm-dev at redking.me.uk, spatel+llvm at rotateright.com

-march=native calls getHostCPUName tries various ways to determine a CPU name. 
If the CPUID vendor says Intel we try a combination of Family/Model
identification followed by a fall back to guessing based on features. For AMD
we only look at Family/Model and if the family/model check fails we report
"generic". If CPUID isn't supported or the vendor isn't AMD or Intel we return
"generic".

Any case that returns "generic" will be rejected by clang -cc1.

We should probably do something sane and at least try to find SSE2 or long mode
before falling back to generic.

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