[cfe-dev] [LLVMdev] NVPTX annotation metadata emission

Justin Holewinski jholewinski at nvidia.com
Mon May 7 07:05:38 PDT 2012

This new metadata format is currently optional.  The old ptx_kernel calling convention should still work.

The only thing you should have to change when converting from PTX -> NVPTX is the address space map.  The calling conventions and intrinsics should be compatible with both.

> -----Original Message-----
> From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu]
> On Behalf Of Alberto Magni
> Sent: Monday, May 07, 2012 6:09 AM
> To: LLVM Developers Mailing List; clang-dev Developers
> Subject: [LLVMdev] NVPTX annotation metadata emission
> Hi everybody,
> I have noticed that the new NVPTX backend requires new metadata to
> identify the kernels in the module:
> define void @metadata_kernel(float* %a) {
>   ret void
> }
> !nvvm.annotations = !{!1}
> !1 = metadata !{void (float*)* @metadata_kernel, metadata !"kernel", i32 1}
> Is clang going to support the emission of this metadata soon ? Or do I have to
> write it on my own ? :)
> Thanks,
> Alberto

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