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Summary: Not all chips targeted by x86_64 have this feature, but a dramatically increasing number do. Specifying a chip-specific tuning parameter will continue to turn the feature on or off as appropriate for that particular chip, but the generic flag should try to achieve the best performance on the most widely available hardware. Today, the number of chips with fast UA access dwarfs those without in the x86-64 space. Note that this also brings LLVM's code generation for this '-march' flag more in line with that of modern GCCs. CC: llvm-commits Differential Revision: http://llvm-reviews.chandlerc.com/D195 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169740 91177308-0d34-0410-b5e6-96231b3b80d8
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