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[RISCV][Clang] Add RVV Type-Convert intrinsic functions.

Authored by khchen on Apr 1 2021, 9:21 AM.

Description

[RISCV][Clang] Add RVV Type-Convert intrinsic functions.

Fix extension macro condition.

Support below instructions:

  1. Single-Width Floating-Point/Integer Type-Convert Instructions
  2. Widening Floating-Point/Integer Type-Convert Instructions
  3. Narrowing Floating-Point/Integer Type-Convert Instructions

Reviewed By: craig.topper

Differential Revision: https://reviews.llvm.org/D99742

Details