[all-commits] [llvm/llvm-project] 762a17: [CIR] Upstream support for cir.indirectbr (#169967)

[Andres-Salamanca via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 762a171b3d6f6eb64dc5a844fcb25caa4ece7d00
      https://github.com/llvm/llvm-project/commit/762a171b3d6f6eb64dc5a844fcb25caa4ece7d00
  Author: Andres-Salamanca <andrealebarbaritos at gmail.com>
  Date:   2025-12-05 (Fri, 05 Dec 2025)

  Changed paths:
    M clang/include/clang/CIR/Dialect/IR/CIROps.td
    M clang/lib/CIR/CodeGen/CIRGenExprScalar.cpp
    M clang/lib/CIR/CodeGen/CIRGenFunction.cpp
    M clang/lib/CIR/CodeGen/CIRGenFunction.h
    M clang/lib/CIR/CodeGen/CIRGenModule.cpp
    M clang/lib/CIR/CodeGen/CIRGenModule.h
    M clang/lib/CIR/CodeGen/CIRGenStmt.cpp
    M clang/lib/CIR/Dialect/IR/CIRDialect.cpp
    M clang/lib/CIR/Dialect/Transforms/CIRCanonicalize.cpp
    M clang/lib/CIR/Lowering/DirectToLLVM/LowerToLLVM.cpp
    M clang/test/CIR/CodeGen/label-values.c
    A clang/test/CIR/IR/indirect-br.cir

  Log Message:
  -----------
  [CIR] Upstream support for cir.indirectbr (#169967)

This PR upstreams support for the `cir.indirectBr` operation, which is
used to implement GCC’s labels-as-values `indirect goto`.
To ensure correct lowering, we introduce precise bookkeeping to
associate each `block_address` operation with its corresponding `label`
op. This is required because a `block_address` may be emitted before the
`label` it refers to. In such cases, the reference is deferred and later
resolved by `resolveBlockAddresses`, which guarantees that all
`indirectBr` successors are emitted in the correct and fully resolved
order.



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