Trouble building NVPTX

[Scott Pakin]

I'd like to try out the nvptx target, but I can't figure out how to build ISPC with NVPTX enabled.  I pulled down the latest version of ISPC from GitHub (9d9e46b8), installed the patched LLVM using the alloy.py script, and built with NVPTX_ENABLED=1.  I always wind up with errors like the following:

Compiling opt.cpp

opt.cpp:817:27: error: no member named 'createTypeBasedAliasAnalysisPass' in

      namespace 'llvm'; did you mean 'createTypeBasedAAWrapperPass'?

          optPM.add(llvm::createTypeBasedAliasAnalysisPass());

                    ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

                          createTypeBasedAAWrapperPass

/tmp/llvm-5.0.0-ispc-patched/bin-5.0/include/llvm/Analysis/TypeBasedAliasAnalysis.h:83:16: note: 

      'createTypeBasedAAWrapperPass' declared here

ImmutablePass *createTypeBasedAAWrapperPass();

               ^

opt.cpp:818:27: error: no member named 'createBasicAliasAnalysisPass' in

      namespace 'llvm'; did you mean 'createCostModelAnalysisPass'?

          optPM.add(llvm::createBasicAliasAnalysisPass());

                    ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

                          createCostModelAnalysisPass

/tmp/llvm-5.0.0-ispc-patched/bin-5.0/include/llvm/Analysis/Passes.h:53:17: note: 

      'createCostModelAnalysisPass' declared here

  FunctionPass *createCostModelAnalysisPass();

and a few more along those lines.  I tried

• installing LLVM/Clang versions 3.8.1 and 5.0.0 and using those, and
• compiling with CXX set to either clang++ (above versions) or g++ (v6.3.0)

in all four combinations.  (This is on an Ubuntu 17.04 system.)  In all cases, I added the patched LLVM/Clang's bin-x.y/bin directory to the start of my PATH, pointed ISPC_HOME to the top-level ISPC directory, and pointed LLVM_HOME to the top level of the patched LLVM/Clang directory.

Without NVPTX_ENABLED=1, ISPC builds fine, although I did have to specify -D_GLIBCXX_USE_CXX11_ABI=1 to make the linker happy.

Any idea what the problem might be?

Thanks,

— Scott

P.S.  I wasn't sure if build questions belong in the Users forum or the Developers forum.  I guessed the latter, but please let me know if I picked the wrong one.

[Dmitry Babokin]

PTX build was not maintained for some time, so the latest version of LLVM it's known to build is 3.5.

You can also try using pre-built binary "ispc-v1.8.2ptx-linux.tar.gz" available here: https://sourceforge.net/projects/ispcmirror/files/v1.8.2/

Even though LLVM 3.5 is quite old, it should not affect performance of resulting ispc too much.

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[Scott Pakin]

On Thursday, October 26, 2017 at 3:22:46 PM UTC-6, Dmitry Babokin wrote:

PTX build was not maintained for some time, so the latest version of LLVM it's known to build is 3.5.

You can also try using pre-built binary "ispc-v1.8.2ptx-linux.tar.gz" available here: https://sourceforge.net/projects/ispcmirror/files/v1.8.2/

Even though LLVM 3.5 is quite old, it should not affect performance of resulting ispc too much.

Thanks.  Downloading the pre-built binary now…

— Scott

P.S.  Kind of a bummer PTX stopped being maintained.  I like the idea of having ISPC code optimized for Xeon, Xeon Phi, and NVIDIA GPUs.