[all-commits] [llvm/llvm-project] 701148: [CIR] Upstream initial support for CIR flattening ...

[Andy Kaylor via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 701148f05a7b90ed6b8c4fc38db4c2b0c9241ffc
      https://github.com/llvm/llvm-project/commit/701148f05a7b90ed6b8c4fc38db4c2b0c9241ffc
  Author: Andy Kaylor <akaylor at nvidia.com>
  Date:   2025-03-11 (Tue, 11 Mar 2025)

  Changed paths:
    M clang/include/clang/CIR/Dialect/CMakeLists.txt
    M clang/include/clang/CIR/Dialect/IR/CIROps.td
    A clang/include/clang/CIR/Dialect/Passes.h
    A clang/include/clang/CIR/Dialect/Passes.td
    M clang/include/clang/CIR/MissingFeatures.h
    M clang/lib/CIR/Dialect/CMakeLists.txt
    M clang/lib/CIR/Dialect/IR/CIRDialect.cpp
    M clang/lib/CIR/Dialect/IR/CMakeLists.txt
    A clang/lib/CIR/Dialect/Transforms/CMakeLists.txt
    A clang/lib/CIR/Dialect/Transforms/FlattenCFG.cpp
    A clang/lib/CIR/Dialect/Transforms/PassDetail.h
    A clang/lib/CIR/Lowering/CIRPasses.cpp
    M clang/lib/CIR/Lowering/CMakeLists.txt
    M clang/lib/CIR/Lowering/DirectToLLVM/CMakeLists.txt
    M clang/lib/CIR/Lowering/DirectToLLVM/LowerToLLVM.cpp
    M clang/lib/CIR/Lowering/DirectToLLVM/LowerToLLVM.h
    A clang/lib/CIR/Lowering/DirectToLLVM/LowerToLLVMIR.cpp
    M clang/test/CIR/Lowering/func-simple.cpp

  Log Message:
  -----------
  [CIR] Upstream initial support for CIR flattening (#130648)

The ClangIR CFG has to be flat before it can be lowered to LLVM IR. That
is, there can be no nested regions and all blocks in a region must
belong to the parent region. Currently only cir.scope operations violate
these rules, so the initial implementation of the cir-flatten-cfg pass
only has to transform scope operations.



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