[all-commits] [llvm/llvm-project] 3d8079: [clang][AArch64][FMV] Stop emitting alias to ifunc...

[Alexandros Lamprineas via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 3d8079229e7571a5912e880bf7a960d809c8ee96
      https://github.com/llvm/llvm-project/commit/3d8079229e7571a5912e880bf7a960d809c8ee96
  Author: Alexandros Lamprineas <alexandros.lamprineas at arm.com>
  Date:   2024-06-24 (Mon, 24 Jun 2024)

  Changed paths:
    M clang/docs/ReleaseNotes.rst
    M clang/lib/CodeGen/CodeGenModule.cpp
    M clang/test/CodeGen/aarch64-mixed-target-attributes.c
    M clang/test/CodeGen/attr-target-clones-aarch64.c
    M clang/test/CodeGen/attr-target-version.c
    M clang/test/CodeGenCXX/attr-target-clones-aarch64.cpp
    M clang/test/CodeGenCXX/attr-target-version.cpp
    M clang/test/CodeGenCXX/fmv-namespace.cpp

  Log Message:
  -----------
  [clang][AArch64][FMV] Stop emitting alias to ifunc. (#96221)

Long story short the interaction of two optimizations happening in
GlobalOpt results in a crash. For more details look at the issue
https://github.com/llvm/llvm-project/issues/96197. I will be fixing this
in GlobalOpt but it is a conservative solution since it won't allow us
to optimize resolvers which return a pointer to a function whose
definition is in another TU when compiling without LTO:

```
__attribute__((target_version("simd"))) void bar(void);
__attribute__((target_version("default"))) void bar(void);
int foo() { bar(); }
```

fixes: #96197



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