[all-commits] [llvm/llvm-project] 23098b: [AMDGPU] Add intrinsic for converting global point...

[Krzysztof Drewniak via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 23098bd4542e76b897696f1d542a26caa5c25020
      https://github.com/llvm/llvm-project/commit/23098bd4542e76b897696f1d542a26caa5c25020
  Author: Krzysztof Drewniak <Krzysztof.Drewniak at amd.com>
  Date:   2023-06-05 (Mon, 05 Jun 2023)

  Changed paths:
    M llvm/docs/AMDGPUUsage.rst
    M llvm/include/llvm/IR/IntrinsicsAMDGPU.td
    M llvm/lib/Analysis/ValueTracking.cpp
    M llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp
    M llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.h
    M llvm/lib/Target/AMDGPU/SIISelLowering.cpp
    M llvm/lib/Target/AMDGPU/SIISelLowering.h
    A llvm/test/CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.make.buffer.rsrc.ll
    A llvm/test/CodeGen/AMDGPU/llvm.amdgcn.make.buffer.rsrc.ll
    A llvm/test/CodeGen/AMDGPU/make-buffer-rsrc-lds-fails.ll
    M llvm/test/CodeGen/AMDGPU/ptr-buffer-alias-scheduling.ll
    M llvm/test/Transforms/LICM/AMDGPU/buffer-rsrc-ptrs.ll

  Log Message:
  -----------
  [AMDGPU] Add intrinsic for converting global pointers to resources

Define the function @llvm.amdgcn.make.buffer.rsrc, which take a 64-bit
pointer, the 16-bit stride/swizzling constant that replace the high 16
bits of an address in a buffer resource, the 32-bit extent/number of
elements, and the 32-bit flags (the latter two being the 3rd and 4th
wards of the resource), and combines them into a ptr addrspace(8).

This intrinsic is lowered during the early phases of the backend.

This intrinsic is needed so that alias analysis can correctly infer
that a certain buffer resource points to the same memory as some
global pointer. Previous methods of constructing buffer resources,
which relied on ptrtoint, would not allow for such an inference.

Depends on D148184

Reviewed By: arsenm

Differential Revision: https://reviews.llvm.org/D148957