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[RISCV][Clang] Add some RVV Permutation intrinsic functions.

Authored by khchen on Apr 8 2021, 10:15 AM.

Description

[RISCV][Clang] Add some RVV Permutation intrinsic functions.

Support the following instructions.

  1. Vector Slide Instructions
  2. Vector Register Gather Instructions
  3. Vector Compress Instruction

Authored-by: Roger Ferrer Ibanez <rofirrim@gmail.com>
Co-Authored-by: Zakk Chen <zakk.chen@sifive.com>

Reviewed By: craig.topper

Differential Revision: https://reviews.llvm.org/D100127

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