[PATCH] D125970: [amdgpu] Add amdgpu_kernel calling conv attribute to clang

[Jon Chesterfield via Phabricator via cfe-commits]

JonChesterfield created this revision.
JonChesterfield added reviewers: arsenm, rampitec, sdesmalen, rjmccall, rnk, aaron.ballman.
Herald added subscribers: kosarev, kerbowa, t-tye, Anastasia, tpr, dstuttard, yaxunl, jvesely, kzhuravl.
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JonChesterfield requested review of this revision.
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Allows emitting define amdgpu_kernel void @func() IR from C or C++.

This replaces the current workflow which is to write a stub in opencl that
calls an external C function implemented in C++ combined through llvm-link.

Calling the resulting function still requires a manual implementation of the
ABI from the host side. The primary application is for more rapid debugging
of the amdgpu backend by permuting a C or C++ test file instead of manually
updating an IR file.

Implementation closely follows D54425 <https://reviews.llvm.org/D54425>. Non-amd reviewers from there.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D125970

Files:
  clang/include/clang/Basic/Attr.td
  clang/include/clang/Basic/Specifiers.h
  clang/lib/AST/ItaniumMangle.cpp
  clang/lib/AST/Type.cpp
  clang/lib/AST/TypePrinter.cpp
  clang/lib/Basic/Targets/AMDGPU.h
  clang/lib/CodeGen/CGCall.cpp
  clang/lib/CodeGen/CGDebugInfo.cpp
  clang/lib/Sema/SemaDeclAttr.cpp
  clang/lib/Sema/SemaType.cpp
  clang/test/Sema/callingconv.c
  clang/tools/libclang/CXType.cpp

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