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[RISCV][Clang] Add more RVV Floating-Point intrinsic functions.

Authored by khchen on Apr 8 2021, 8:09 AM.

Description

[RISCV][Clang] Add more RVV Floating-Point intrinsic functions.

Support below instructions.

  1. Vector Widening Floating-Point Add/Subtract Instructions
  2. Vector Widening Floating-Point Multiply
  3. Vector Single-Width Floating-Point Fused Multiply-Add Instructions
  4. Vector Widening Floating-Point Fused Multiply-Add Instructions
  5. Vector Floating-Point Compare Instructions

Reviewed By: craig.topper, HsiangKai

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

Differential Revision: https://reviews.llvm.org/D99669