[llvm-bugs] [Bug 50781] New: [X86] __tune_* defines don't follow -mtune

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https://bugs.llvm.org/show_bug.cgi?id=50781

            Bug ID: 50781
           Summary: [X86] __tune_* defines don't follow -mtune
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            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, pengfei.wang at intel.com,
                    spatel+llvm at rotateright.com

Note this is really a clang bug, but there's no good component for target
specific clang code and this component has the right CC list.

When I implemented -mtune support, I failed to make the preprocessor defines
follow the -mtune setting.

This probably means we need a setTuneCPU function like setCPU in TargetInfo.
Then we need to split defineCPUMacros to remove the tuning define. I think
other targets use defineCPUMacros, but set a bool to not define the tune
defines so removing the code simplies the interface.

I probably won't have a chance to work on this for a while. Pengfei, can you or
someone at Intel handle it?

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