[all-commits] [llvm/llvm-project] dccfaa: [InferAddressSpaces] Handle the pair of `ptrtoint`...

[darkbuck via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: dccfaacf93e1c4801cbcc4686f64eb8a35564ff7
      https://github.com/llvm/llvm-project/commit/dccfaacf93e1c4801cbcc4686f64eb8a35564ff7
  Author: Michael Liao <michael.hliao at gmail.com>
  Date:   2020-06-25 (Thu, 25 Jun 2020)

  Changed paths:
    M clang/test/CodeGenCUDA/amdgpu-kernel-arg-pointer-type.cu
    M llvm/lib/Transforms/Scalar/InferAddressSpaces.cpp
    A llvm/test/Transforms/InferAddressSpaces/AMDGPU/noop-ptrint-pair.ll

  Log Message:
  -----------
  [InferAddressSpaces] Handle the pair of `ptrtoint`/`inttoptr`.

Summary:
- `ptrtoint` and `inttoptr` are defined as no-op casts if the integer
  value as the same size as the pointer value. The pair of
  `ptrtoint`/`inttoptr` is in fact a no-op cast sequence between
  different address spaces. Teach `infer-address-spaces` to handle them
  like a `bitcast`.

Reviewers: arsenm, chandlerc

Subscribers: jvesely, wdng, nhaehnle, hiraditya, kerbowa, cfe-commits, llvm-commits

Tags: #clang, #llvm

Differential Revision: https://reviews.llvm.org/D81938