[all-commits] [llvm/llvm-project] a11fee: [CIR] Make cir.alloca alignment mandatory (#172663)

[Akimasa Watanuki via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a11feef2e11da15e4f874bf72dcdc827e60464cb
      https://github.com/llvm/llvm-project/commit/a11feef2e11da15e4f874bf72dcdc827e60464cb
  Author: Akimasa Watanuki <mencotton0410 at gmail.com>
  Date:   2026-01-14 (Wed, 14 Jan 2026)

  Changed paths:
    M clang/include/clang/CIR/Dialect/IR/CIROps.td
    M clang/lib/CIR/Lowering/DirectToLLVM/LowerToLLVM.cpp
    M clang/test/CIR/IR/invalid-complex.cir
    M clang/test/CIR/IR/invalid-throw.cir
    M clang/test/CIR/IR/invalid-try-catch.cir
    M clang/test/CIR/IR/invalid-vector.cir
    M clang/test/CIR/IR/resume-flat.cir
    M clang/test/CIR/IR/struct.cir
    M clang/test/CIR/IR/throw.cir
    M clang/test/CIR/IR/vector.cir
    A clang/test/CIR/Lowering/alloca.cir
    M clang/test/CIR/Transforms/complex-create-fold.cir
    M clang/test/CIR/Transforms/complex-imag-fold.cir
    M clang/test/CIR/Transforms/complex-real-fold.cir
    M clang/test/CIR/Transforms/ternary-fold.cir
    M clang/test/CIR/Transforms/vector-extract-fold.cir

  Log Message:
  -----------
  [CIR] Make cir.alloca alignment mandatory (#172663)

Fixed a crash in `CIRToLLVMAllocaOpLowering` where `cir.alloca`
operations without an explicit alignment attribute caused failures.

Modified the ODS definition of `cir.alloca` to use
`ConfinedAttr<I64Attr, [IntMinValue<0>]>`. This ensures the attribute is
always present.

Added a regression test in `clang/test/CIR/Lowering/alloca.cir`.

---------

Co-authored-by: Sirui Mu <msrlancern at gmail.com>



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