[llvm-bugs] [Bug 30516] New: Autodetection of Host CPUs on AArch64

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=30516

            Bug ID: 30516
           Summary: Autodetection of Host CPUs on AArch64
           Product: libraries
           Version: trunk
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Support Libraries
          Assignee: unassignedbugs at nondot.org
          Reporter: hegdesmailbox at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 17344
  --> https://llvm.org/bugs/attachment.cgi?id=17344&action=edit
Modified Host.cpp with reference code for some more CPUs supporting AArch64
state.

In the file lib/Support/Host.cpp, getHostCPUName() implements a small set of
CPUs (under ARM Architecture) for autodetection with -mcpu=native option. And
for the AArch74 state, there is no autodetection at all.

It was discussed that the existing design duplicates the code and makes it look
cluttered. We need an API kind of interface instead of repeated "for" loops.

A modified Host.cpp is attached here for quick reference of the CPU codes.
Though the modification is functionally correct, it was discussed that the
design is not scalable especially given the fact that AArch64 base may grow
substantially with multiple vendors.

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