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Summary: Proposal and roadmap towards vector predication in LLVM. This patch documents that a) It is recognized that current LLVM is ill-equipped for vector predication. b) The community is working on a solution. c) A concrete prototype exists in the VP extension (D57504). Reviewers: rkruppe, rengolin, cameron.mcinally, SjoerdMeijer, andrew.w.kaylor, craig.topper, sdesmalen, k-ishizaka, lattner, fhahn Reviewed By: andrew.w.kaylor Subscribers: rogfer01, merge_guards_bot, simoncook, s.egerton, llvm-commits, efocht Tags: #llvm Differential Revision: https://reviews.llvm.org/D73889