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[Doc] Update SYCL CUDA documentation #4214

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Merged
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Jul 30, 2021
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[Doc] Update SYCL CUDA documentation #4214

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e6d603a
[Doc] Update SYCL CUDA documentation
Naghasan Jul 29, 2021
a28da0f
Update sycl/doc/CompilerAndRuntimeDesign.md
bader Jul 30, 2021
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2 changes: 1 addition & 1 deletion clang/include/clang/Driver/Action.h
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Expand Up @@ -738,7 +738,7 @@ class SYCLPostLinkJobAction : public JobAction {
void anchor() override;

public:
// The tempfiletable management relies on a shadowing the main file type by
// The tempfiletable management relies on shadowing the main file type by
// types::TY_Tempfiletable. The problem of shadowing is it prevents its
// integration with clang tools that relies on the file type to properly set
// args.
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16 changes: 9 additions & 7 deletions sycl/doc/CompilerAndRuntimeDesign.md
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Expand Up @@ -548,13 +548,15 @@ down to the NVPTX Back End. All produced bitcode depends on two libraries,

During the "PTX target processing" in the device linking step [Device
code post-link step](#device-code-post-link-step), the llvm bitcode
objects for the CUDA target are linked together alongside
`libspirv-nvptx64--nvidiacl.bc` and `libdevice.bc`, compiled to PTX
using the NVPTX backend and assembled into a cubin using the `ptxas`
tool (part of the CUDA SDK). The PTX file and cubin are assembled
together using `fatbinary` to produce a CUDA fatbin. The CUDA fatbin
then replaces the llvm bitcode file in the file table generated by
`sycl-post-link`. The resulting table is passed to the offload wrapper tool.
objects for the CUDA target are linked together during the common
`llvm-link` step and then split using the `sycl-post-link` tool.
For each temporary bitcode file, clang is invoked for the temporary file to link
`libspirv-nvptx64--nvidiacl.bc` and `libdevice.bc` and compile the resulting
module to PTX using the NVPTX backend. The resulting PTX file is assembled
into a cubin using the `ptxas` tool (part of the CUDA SDK). The PTX file and
cubin are assembled together using `fatbinary` to produce a CUDA fatbin.
The produced CUDA fatbins then replace the llvm bitcode files in the file table generated
by `sycl-post-link`. The resulting table is passed to the offload wrapper tool.

![NVPTX AOT build](images/DevicePTXProcessing.svg)

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