[all-commits] [llvm/llvm-project] 631248: [X86_64] fix empty structure vaarg in c++ (#77907)

[hstk30-hw via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 631248dcd26fdec772cedb569be94ff8f12d0901
      https://github.com/llvm/llvm-project/commit/631248dcd26fdec772cedb569be94ff8f12d0901
  Author: hstk30-hw <hanwei62 at huawei.com>
  Date:   2024-03-21 (Thu, 21 Mar 2024)

  Changed paths:
    M clang/lib/CodeGen/Targets/X86.cpp
    A clang/test/CodeGenCXX/x86_64-vaarg.cpp

  Log Message:
  -----------
  [X86_64] fix empty structure vaarg in c++ (#77907)

SizeInBytes of empty structure is 0 in C, while 1 in C++. And empty
structure argument of the function is ignored in X86_64 backend.As a
result, the value of variable arguments in C++ is incorrect. fix #77036

Co-authored-by: Longsheng Mou <moulongsheng at huawei.com>



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