Link devicelib during device code compilation #15114
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August 13, 2024 14:39
Create one single bitcode library for NVPTX by compiling each libdev file into bitcode first, linking these together and running opt on them. Strip away metadata by reusing prepare_builtins from libclc. Remove NVPTX bundles from the libdev object files and remove any unbundling action spawned by the Clang driver for the SYCL toolchain when compiling for the NVPTX backend. Make the driver link against the single bitcode libraries for NVPTX for the SYCL toolchain when device library linkage is not excluded. Ensure that the clang tests check for the correctness of the new clang driver actions and check if the driver still links the device code against the itt device libraries when device library linkage has been excluded. Refactor SYCLLibdevice.cmake by creating functions and grouping e.g. the same compilation flags for a filetype together in one variable. Reuse these variables and call functions to remove redundancies.
Use the -mlink-builtin-bitcode flag to link the CUDA devicelib during device code compilation instead of generating a separate llvm-link action in the driver. Add a new flag to exclude linking of libdevice completely. Add a new error in case that the cuda devicelib file can not be found.
MartinWehking
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MartinWehking
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WindowsCILock
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Closed, see discussions in #15083 |
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Note: This patch is based on 15048 (Not merged yet)
and links against the final resulting bitcode library that is created through that patch
Use the
-mlink-builtin-bitcodeflag to link the CUDA devicelibduring device code compilation instead of generating a separate
llvm-link action in the driver.
Add a new flag to exclude linking of libdevice completely.
Add a new error in case that the cuda devicelib file can not be found.