[PATCH] D155986: [clang][AMDGPU]: Don't use byval for struct arguments in function ABI

[Changpeng Fang via Phabricator via llvm-commits]

cfang created this revision.
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Byval requires allocating additional stack space, and always requires an implicit copy to be inserted in codegen,
where it can be difficult to optimize.  In this work, we use byref/IndirectAliased promotion method instead of
byval with the implicit copy semantics.


https://reviews.llvm.org/D155986

Files:
  clang/lib/CodeGen/CGCall.cpp
  clang/lib/CodeGen/Targets/AMDGPU.cpp
  clang/test/CodeGenCXX/amdgcn-func-arg.cpp
  clang/test/CodeGenOpenCL/addr-space-struct-arg.cl
  clang/test/CodeGenOpenCL/amdgpu-abi-struct-coerce.cl
  clang/test/CodeGenOpenCL/byval.cl

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