[all-commits] [llvm/llvm-project] 735209: [NVPTX] Unify and extend barrier{.cta} intrinsic s...

[Alex MacLean via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 735209c0688b10a66c24750422b35d8c2ad01bb5
      https://github.com/llvm/llvm-project/commit/735209c0688b10a66c24750422b35d8c2ad01bb5
  Author: Alex MacLean <amaclean at nvidia.com>
  Date:   2025-05-21 (Wed, 21 May 2025)

  Changed paths:
    M clang/lib/CodeGen/TargetBuiltins/NVPTX.cpp
    M clang/test/CodeGen/builtins-nvptx-ptx60.cu
    M clang/test/CodeGen/builtins-nvptx.c
    M clang/test/Headers/gpuintrin.c
    M llvm/docs/NVPTXUsage.rst
    M llvm/include/llvm/IR/IntrinsicsNVVM.td
    M llvm/lib/IR/AutoUpgrade.cpp
    M llvm/lib/Target/NVPTX/NVPTXInstrInfo.td
    M llvm/lib/Target/NVPTX/NVPTXIntrinsics.td
    M llvm/lib/Transforms/IPO/AttributorAttributes.cpp
    M llvm/test/Analysis/GlobalsModRef/functions_without_nosync.ll
    M llvm/test/Assembler/auto_upgrade_nvvm_intrinsics.ll
    M llvm/test/CodeGen/NVPTX/barrier.ll
    R llvm/test/CodeGen/NVPTX/named-barriers.ll
    M llvm/test/CodeGen/NVPTX/noduplicate-syncthreads.ll
    M llvm/test/Feature/intrinsic-noduplicate.ll
    M llvm/test/Transforms/FunctionAttrs/convergent.ll
    M llvm/test/Transforms/JumpThreading/thread-two-bbs-cuda.ll
    M llvm/test/Transforms/OpenMP/barrier_removal.ll
    M mlir/include/mlir/Dialect/LLVMIR/NVVMOps.td
    M mlir/test/Target/LLVMIR/Import/nvvmir.ll
    M mlir/test/Target/LLVMIR/nvvmir.mlir

  Log Message:
  -----------
  [NVPTX] Unify and extend barrier{.cta} intrinsic support (#140615)

Our current intrinsic support for barrier intrinsics is confusing and
incomplete, with multiple intrinsics mapping to the same instruction and
intrinsic names not clearly conveying intrinsic semantics. Further, we
lack support for some variants. This change unifies the IR
representation to a single consistently named set of intrinsics.

- llvm.nvvm.barrier.cta.sync.aligned.all(i32)
- llvm.nvvm.barrier.cta.sync.aligned(i32, i32)
- llvm.nvvm.barrier.cta.arrive.aligned(i32, i32)
- llvm.nvvm.barrier.cta.sync.all(i32)
- llvm.nvvm.barrier.cta.sync(i32, i32)
- llvm.nvvm.barrier.cta.arrive(i32, i32)

The following Auto-Upgrade rules are used to maintain compatibility with
IR using the legacy intrinsics:

* llvm.nvvm.barrier0 --> llvm.nvvm.barrier.cta.sync.aligned.all(0)
* llvm.nvvm.barrier.n --> llvm.nvvm.barrier.cta.sync.aligned.all(x)
* llvm.nvvm.bar.sync --> llvm.nvvm.barrier.cta.sync.aligned.all(x)
* llvm.nvvm.barrier --> llvm.nvvm.barrier.cta.sync.aligned(x, y)
* llvm.nvvm.barrier.sync --> llvm.nvvm.barrier.cta.sync.all(x)
* llvm.nvvm.barrier.sync.cnt --> llvm.nvvm.barrier.cta.sync(x, y)



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