[Libclc-dev] libclc with nvptx backend

Yazhou Zu yazhou.zu at utexas.edu
Thu Nov 7 21:25:17 PST 2013


       I'm tring to use clang to comiple OpenCL source files into LLVM IR,
and use LLVM NVPTX backend to generate PTX IR for nvidia gpus.

       I tried the following command:

       svn checkout http://llvm.org/svn/llvm-project/libclc/trunk libclc
     built it with ./configure.py
--with-llvm-config=$PWD/../install-trunk/bin/llvm-config make
      clang -Dcl_clang_storage_class_specifiers -isystem
libclc/generic/include -include clc/clc.h -target nvptx -xcl
test.cl-emit-llvm -S -o test.ll

    then it went wrong with this command :
    llvm-link libclc/nvptx--nvidiacl/lib/builtins.bc test.ll -o

    I can't find builtins.bc. I can only find builtins.link.bc and
    Can some one tell me how to fix this?

    However, I can use

llc -march=nvptx -mcpu=sm_13 trivial-kernel.ll -o trivial-kernel.ptx

 to generate ptx code. Is it ok to do so?
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