[llvm] r206211 - [ARM64][MC] Set the default CPU to cyclone when initilizating the MC layer.

[Andrew Trick]

On Apr 16, 2014, at 12:37 PM, Tim Northover <t.p.northover at gmail.com> wrote:

>> Of course a target should be able to provide a cpu type called “generic" if
>> it wants to. If the driver for some platform decides to use “generic” as the
>> default, that’s fine with me. For ARM64, “generic" doesn’t seem very useful
>> except to test certain features of the backend, and certainly should not be
>> a default.
> 
> That "except" is rather important to me. I'd really rather not have to
> remember to specify a valid "-mcpu" every time I execute llc, if I
> understand you correctly. I'm annoyed enough by the regular intrusion
> of "-mattr=neon" and friends.
> 
> I suppose if anything I'd want llc to choose a maximal sensible CPU
> rather than a minimal one. Possibly with its own logic.

You’re asking for logic to pick a platform-specific default to be in a library that can be used by both clang and llc. That sounds great to me, as long as clang/llc are consistent. It’s just more work than forcing llc to take explicit options and less important to me.

-Andy

> Cheers.
> 
> Tim.