[all-commits] [llvm/llvm-project] 5f648c: [AArch64] Change the coercion type of structs with...

[David Green via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5f648c370edf5d71c471ffbabdaaa821ad05fb4b
      https://github.com/llvm/llvm-project/commit/5f648c370edf5d71c471ffbabdaaa821ad05fb4b
  Author: David Green <david.green at arm.com>
  Date:   2025-06-10 (Tue, 10 Jun 2025)

  Changed paths:
    M clang/lib/CodeGen/Targets/AArch64.cpp
    M clang/test/CodeGen/AArch64/struct-coerce-using-ptr.cpp
    M clang/test/CodeGen/ptrauth-in-c-struct.c
    M clang/test/CodeGenCXX/ptrauth-qualifier-struct.cpp
    M clang/test/CodeGenCXX/trivial_abi.cpp

  Log Message:
  -----------
  [AArch64] Change the coercion type of structs with pointer members. (#135064)

The aim here is to avoid a ptrtoint->inttoptr round-trip through the function
argument whilst keeping the calling convention the same. Given a struct which
is <= 128bits in size, which can only contain either 1 or 2 pointers, we
convert to a ptr or [2 x ptr] as opposed to the old coercion that uses i64 or
[2 x i64]. This helps alias analysis produce more accurate results.



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