[PATCH] D44984: [HIP] Add hip file type and codegen for kernel launching

[Artem Belevich via Phabricator via cfe-commits]

tra added a subscriber: gregrodgers.
tra added a comment.

The changes appear to cover only some of the functionality needed to enable HIP support. Do you have more patches in queue? Having complete picture would help to make sense of the overall plan.
I did ask for it in https://reviews.llvm.org/D42800, but I don't think I've got the answers. It would help a lot if you or @gregrodgers could write a doc somewhere outlining overall plan for HIP support in clang, what are the main issues that need to be dealt with, and at least a general idea on how to handle them.

As far as "add -x hip, and tweak runtime glue codegen" goes, the change looks OK, but it's not very useful all by itself. It leaves a lot of other issues unsolved and no clear plan on whether/when/how you are planning to deal with them.

As things stand right now, with this patch clang will still attempt to include CUDA headers, which, among other things will provide threadIdx/blockIdx and other CUDA-specific features.
Perhaps it would make sense to disable pre-inclusion of CUDA headers and, probably, disable use of CUDA's libdevice bitcode library if we're compiling with -x hip (i.e. -nocudainc -nocudalib).
If you do depend on CUDA headers, then, I suspect, you may need to adjust some wrapper headers we use for CUDA and that change should probably come before this one.



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Comment at: test/CodeGenCUDA/device-stub.cu:2-9
+// RUN: %clang_cc1 -triple x86_64-linux-gnu -emit-llvm %s -fcuda-include-gpubinary %t -o - | FileCheck -check-prefixes=CHECK,CUDA %s
 // RUN: %clang_cc1 -triple x86_64-linux-gnu -emit-llvm %s -fcuda-include-gpubinary %t -o -  -DNOGLOBALS \
 // RUN:   | FileCheck %s -check-prefix=NOGLOBALS
-// RUN: %clang_cc1 -triple x86_64-linux-gnu -emit-llvm %s -o - | FileCheck %s -check-prefix=NOGPUBIN
+// RUN: %clang_cc1 -triple x86_64-linux-gnu -x hip -emit-llvm %s -o - | FileCheck %s -check-prefix=NOGPUBIN
+// RUN: %clang_cc1 -triple x86_64-linux-gnu -x hip -emit-llvm %s -fcuda-include-gpubinary %t -o - | FileCheck -check-prefixes=CHECK,HIP %s
+// RUN: %clang_cc1 -triple x86_64-linux-gnu -x hip -emit-llvm %s -fcuda-include-gpubinary %t -o -  -DNOGLOBALS \
+// RUN:   | FileCheck %s -check-prefix=NOGLOBALS
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Please wrap the long lines.


https://reviews.llvm.org/D44984