[all-commits] [llvm/llvm-project] d4ed25: [RISCV] Assume no-op addrspacecasts by default

[Fraser Cormack via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: d4ed253d0b8487d9e9fd95a3895f83c437e5e7bb
      https://github.com/llvm/llvm-project/commit/d4ed253d0b8487d9e9fd95a3895f83c437e5e7bb
  Author: Fraser Cormack <fraser at codeplay.com>
  Date:   2020-12-18 (Fri, 18 Dec 2020)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVTargetMachine.cpp
    M llvm/lib/Target/RISCV/RISCVTargetMachine.h
    A llvm/test/CodeGen/RISCV/addrspacecast.ll

  Log Message:
  -----------
  [RISCV] Assume no-op addrspacecasts by default

To support OpenCL, which typically uses SPIR as an IR, non-zero address
spaces must be accounted for. This patch makes the RISC-V target assume
no-op address space casts across the board, which effectively removes
the need to support addrspacecast instructions in the backend.

For a RISC-V implementation with different configurations or specialized
address spaces where casts aren't no-ops, the function can be adjusted
as required.

Reviewed By: jrtc27

Differential Revision: https://reviews.llvm.org/D93536