[all-commits] [llvm/llvm-project] 4706a2: Avoid setting tbaa on the store of return type of ...

[schittir via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4706a297fb9ebe6af91ee2c92e5eb196dc2785f7
      https://github.com/llvm/llvm-project/commit/4706a297fb9ebe6af91ee2c92e5eb196dc2785f7
  Author: Sindhu Chittireddy <sindhu.chittireddy at intel.com>
  Date:   2021-12-14 (Tue, 14 Dec 2021)

  Changed paths:
    M clang/lib/CodeGen/CGStmt.cpp
    M clang/lib/CodeGen/CodeGenFunction.h
    A clang/test/CodeGen/avoidTBAAonASMstore.cpp

  Log Message:
  -----------
  Avoid setting tbaa on the store of return type of call to inline assembler.

In 32bit mode, attaching TBAA metadata to the store following the call
to inline assembler results in describing the wrong type by making a
fake lvalue(i.e., whatever the inline assembler happens to leave in
EAX:EDX.) Even if inline assembler somehow describes the correct type,
setting TBAA information on return type of call to inline assembler is
likely not correct, since TBAA rules need not apply to inline assembler.

Differential Revision: https://reviews.llvm.org/D115320