[PATCH] D59566: [X86] Correct the value of MaxAtomicInlineWidth for pre-586 cpus

[Eli Friedman via Phabricator via llvm-commits]

efriedma added a comment.

Technically, I guess the default for MaxAtomicInlineWidth should be zero, since 386 doesn't have cmpxchg... but I don't think anyone cares, so we'll pretend 486 is the oldest possible x86 processor. Probably enough to just have a test to check that the defines are set properly for an 486 target.

We should probably also fix the LLVM backend to add a cmpxchg8 feature bit.


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  https://reviews.llvm.org/D59566/new/

https://reviews.llvm.org/D59566