[ARM] Add MVE vector compare instructions.
Summary:
These take a pair of vector register to compare, and a comparison type
(written in the form of an Arm condition suffix); they output a vector
of booleans in the VPR register, where predication can conveniently
use them.
Reviewers: dmgreen, samparker, SjoerdMeijer, t.p.northover
Subscribers: javed.absar, kristof.beyls, hiraditya, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D62676
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@364027
91177308-0d34-0410-b5e6-
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