Pre-RFC: Gradual Transition of NixOS x86_64 Baseline to x86-64-v3 with an Intermediate Step to x86-64-v2

How do enthusiastic NixOS users go about testing the impact of these flags themselves? The last time I tried to set build flags to optimize for a specific x86-64 psABI level for my whole system following the guide on the wiki, it simply didn’t seem to work: Nix CPU global CPU flags - #2 by pauldoo

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