Build RV as a LLVM plugin

Question

Build RV as a LLVM plugin

vchuravy opened this issue 4 years ago · comments

I was thinking about how best to deploy RV for my usecase and I am curious if anyone has tried building RV as an LLVM/opt plugin.

We link against the LLVM dylib and being able to dlopen and then add the RV passes would greatly simplify the deployment for us.

Simon Moll · Answer 1 · Mon Sep 28 2020 16:34:28 GMT+0800 (China Standard Time)

That's available in the NEC version (hpce/develop branch): sx-aurora-dev@ff98942
I'll pick the patch onto master.

Simon Moll · Answer 2 · Wed Sep 30 2020 22:21:12 GMT+0800 (China Standard Time)

Fixed by 86ffc07

NigelYYB · Answer 3 · Thu Oct 01 2020 06:02:21 GMT+0800 (China Standard Time)

I might have missed something. I got a LLVMRV.so instead of libRV.so, is this expected?

Also, with this commit, I can't do opt -load <path_to_lib>/LLVMRV.so -rv helloworld.ll because it doesn't recognize the -rv option. This is the same for clang++ -O3 -fplugin=<path_to_lib>/LLVMRV.so -mllvm -rv helloworld.cpp. I'm new to LLVM pass managers and plugins.. The registerRVPasses wasn't invoked in my case.. Are we missing the static RegisterPass<PassName> in all the passes or some other magic parts?

Thanks~

Simon Moll · Answer 4 · Thu Oct 01 2020 16:31:23 GMT+0800 (China Standard Time)

I might have missed something. I got a LLVMRV.so instead of libRV.so, is this expected?

Also, with this commit, I can't do opt -load <path_to_lib>/LLVMRV.so -rv helloworld.ll because it doesn't recognize the -rv option. This is the same for clang++ -O3 -fplugin=<path_to_lib>/LLVMRV.so -mllvm -rv helloworld.cpp. I'm new to LLVM pass managers and plugins.. The registerRVPasses wasn't invoked in my case.. Are we missing the static RegisterPass<PassName> in all the passes or some other magic parts?

Thanks~

There should still be a libRV.so if there was one before. What's your build configuration (cmake args)?

NigelYYB · Answer 5 · Thu Oct 01 2020 21:41:46 GMT+0800 (China Standard Time)

Actually I've got 2 files LLVMRV.so and libRV.a using the following cmake args along with other LLVM cmake args.
The rv folder is at llvm-project/rv along side the llvm and clang folder.

             -DLLVM_EXTERNAL_PROJECTS="rv" \
             -DLLVM_EXTERNAL_RV_SOURCE_DIR=../rv \
             -DRV_ENABLE_CRT=on \
             -DRV_ENABLE_SLEEF=on \
             -DRV_ENABLE_ADVSIMD=on \

I could manually convert libRV.a to a .so file, tho.

Update

I manually converted the libRV.a to libRV.so and pass registration worked. I will double check my build config. Thanks~~