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openedon Feb 12, 2021
Page 14 of the 2020-08-31 version of the AMD64 supplement to the System V ABI defines new microarchitecture levels that bundle instruction set extensions: x86-64-v2, x86-64-v3, and x86-64-v4. According to a Red Hat blog post, LLVM 12 will support these.
rustc should support these as target_cpu values, enable the right target_features, and pass them appropriately to LLVM.
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