[all-commits] [llvm/llvm-project] a5db2c: [CIR] Add support for -ffine-grained-bitfield-acce...

[Andres-Salamanca via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a5db2c28443559f5a19f76f9a91ef3280231a969
      https://github.com/llvm/llvm-project/commit/a5db2c28443559f5a19f76f9a91ef3280231a969
  Author: Andres-Salamanca <andrealebarbaritos at gmail.com>
  Date:   2025-07-29 (Tue, 29 Jul 2025)

  Changed paths:
    M clang/include/clang/CIR/MissingFeatures.h
    M clang/lib/CIR/CodeGen/CIRGenRecordLayoutBuilder.cpp
    A clang/test/CIR/CodeGen/finegrain-bitfield-access.cpp

  Log Message:
  -----------
  [CIR] Add support for -ffine-grained-bitfield-accesses (#150687)

This PR adds support for `-ffine-grained-bitfield-accesses`. I reused
the tests from classic CodeGen, available here:

[https://github.com/llvm/llvm-project/blob/c2c881fcc85e0c2d7a050b0199d4dadf8f556b9e/clang/test/CodeGenCXX/finegrain-bitfield-access.cpp](https://github.com/llvm/llvm-project/blob/c2c881fcc85e0c2d7a050b0199d4dadf8f556b9e/clang/test/CodeGenCXX/finegrain-bitfield-access.cpp)

We produce almost exactly the same codegen, except when returning a
variable: we emit an extra variable to hold the return value, whereas
classic CodeGen does not. Also, the GEP instructions use slightly
different syntax compared to classic CodeGen.



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