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Earlier this year Edward Kmett requested [1] that we enable passing of vector values in vector registers by default. The GHC calling convention changes have been in LLVM for a number of years now so let's just flip the switch. [1] https://mail.haskell.org/pipermail/ghc-devs/2017-March/013905.html Reviewers: austin Subscribers: rwbarton, thomie Differential Revision: https://phabricator.haskell.org/D4142
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