LIBCLC and AMD RADEON HD R9 290 (Hawaii)

Hi,

I’m using Clang/LLVM 3.7 and libclc from the repository to compile and OpenCL kernel.

typedef float DATA_TYPE;

__kernel void gemm(__global DATA_TYPE *a, __global DATA_TYPE *b, __global DATA_TYPE *c, DATA_TYPE alpha, DATA_TYPE beta, int ni, int nj, int nk)
{
int j = get_global_id(0);
int i = get_global_id(1);

if ((i < ni) && (j < nj))
{
c[i * nj + j] *= beta;
int k;
for(k=0; k < nk; k++)
{
c[i * nj + j] += alpha * a[i * nk + k] * b[k * nj +j];
}
}
}

I’m doing it as follows:
clang -Dcl_clang_storage_class_specifiers -isystem libclc/generic/include -include clc/clc.h -target amdgcn -S -emit-llvm -xcl -o gemm.ll gemm.cl
llvm-link /usr/local/lib/clc/hawaii-amdgcn–.bc gemm.ll -o gemm.linked.bc
clang -target amdgcn gemm.linked.bc -S -o gemm.hawaii.s

When I execute the third command, I get the following error:

warning: overriding the module target triple with amdgcn [-Woverride-module]
Pass ‘Structurize control flow’ is not initialized.
Verify if there is a pass dependency cycle.
Required Passes:
Lower SwitchInst’s to branches
Dominator Tree Construction
#0 0x13e06b8 llvm::sys::PrintStackTrace(llvm::raw_ostream&) (/opt/clang+llvm-3.7.0-x86_64-linux-gnu-ubuntu-14.04/bin/clang-3.7+0x13e06b8)
#1 0x13e1a1b SignalHandler(int) (/opt/clang+llvm-3.7.0-x86_64-linux-gnu-ubuntu-14.04/bin/clang-3.7+0x13e1a1b)
#2 0x7fcb0f850340 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x10340)
#3 0x1122128 llvm::PMTopLevelManager::schedulePass(llvm::Pass*) (/opt/clang+llvm-3.7.0-x86_64-linux-gnu-ubuntu-14.04/bin/clang-3.7+0x1122128)
#4 0xf7015e llvm::TargetPassConfig::addPass(llvm::Pass*, bool, bool) (/opt/clang+llvm-3.7.0-x86_64-linux-gnu-ubuntu-14.04/bin/clang-3.7+0xf7015e)
#5 0x7ffd69 (anonymous namespace)::GCNPassConfig::addPreISel() (/opt/clang+llvm-3.7.0-x86_64-linux-gnu-ubuntu-14.04/bin/clang-3.7+0x7ffd69)
#6 0xf709f5 llvm::TargetPassConfig::addISelPrepare() (/opt/clang+llvm-3.7.0-x86_64-linux-gnu-ubuntu-14.04/bin/clang-3.7+0xf709f5)
#7 0xef6807 addPassesToGenerateCode(llvm::LLVMTargetMachine*, llvm::legacy::PassManagerBase&, bool, void const*, void const*, void const*, llvm::MachineFunctionInitializer*) (/opt/clang+llvm-3.7.0-x86_64-linux-gnu-ubuntu-14.04/bin/clang-3.7+0xef6807)
#8 0xef60cd llvm::LLVMTargetMachine::addPassesToEmitFile(llvm::legacy::PassManagerBase&, llvm::raw_pwrite_stream&, llvm::TargetMachine::CodeGenFileType, bool, void const*, void const*, void const*, llvm::MachineFunctionInitializer*) (/opt/clang+llvm-3.7.0-x86_64-linux-gnu-ubuntu-14.04/bin/clang-3.7+0xef60cd)
#9 0x14b5c79 clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions const&, llvm::StringRef, llvm::Module*, clang::BackendAction, llvm::raw_pwrite_stream*) (/opt/clang+llvm-3.7.0-x86_64-linux-gnu-ubuntu-14.04/bin/clang-3.7+0x14b5c79)
#10 0x197634d clang::CodeGenAction::ExecuteAction() (/opt/clang+llvm-3.7.0-x86_64-linux-gnu-ubuntu-14.04/bin/clang-3.7+0x197634d)
#11 0x173c9e9 clang::FrontendAction::Execute() (/opt/clang+llvm-3.7.0-x86_64-linux-gnu-ubuntu-14.04/bin/clang-3.7+0x173c9e9)
#12 0x170d4d3 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/clang+llvm-3.7.0-x86_64-linux-gnu-ubuntu-14.04/bin/clang-3.7+0x170d4d3)
#13 0x17a9de3 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/clang+llvm-3.7.0-x86_64-linux-gnu-ubuntu-14.04/bin/clang-3.7+0x17a9de3)
#14 0x6f6634 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/clang+llvm-3.7.0-x86_64-linux-gnu-ubuntu-14.04/bin/clang-3.7+0x6f6634)
#15 0x6f586f main (/opt/clang+llvm-3.7.0-x86_64-linux-gnu-ubuntu-14.04/bin/clang-3.7+0x6f586f)
#16 0x7fcb0ec7cec5 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21ec5)
#17 0x6f2893 _start (/opt/clang+llvm-3.7.0-x86_64-linux-gnu-ubuntu-14.04/bin/clang-3.7+0x6f2893)
Stack dump:
0. Program arguments: /opt/clang+llvm-3.7.0-x86_64-linux-gnu-ubuntu-14.04/bin/clang-3.7 -cc1 -triple amdgcn -S -disable-free -disable-llvm-verifier -main-file-name gemm.linked.bc -mrelocation-model static -mthread-model posix -mdisable-fp-elim -fmath-errno -no-integrated-as -mconstructor-aliases -dwarf-column-info -coverage-file /home/rjfn/Desktop/polybench-gpu-1.0/OpenCL/GEMM/gemm.hawaii.s -resource-dir /opt/clang+llvm-3.7.0-x86_64-linux-gnu-ubuntu-14.04/bin/…/lib/clang/3.7.0 -fno-dwarf-directory-asm -fdebug-compilation-dir /home/rjfn/Desktop/polybench-gpu-1.0/OpenCL/GEMM -ferror-limit 19 -fmessage-length 0 -mstackrealign -fobjc-runtime=gcc -fdiagnostics-show-option -o gemm.hawaii.s -x ir gemm.linked.bc
clang-3.7: error: unable to execute command: Segmentation fault (core dumped)
clang-3.7: error: clang frontend command failed due to signal (use -v to see invocation)
clang version 3.7.0 (tags/RELEASE_370/final)
Target: amdgcn
Thread model: posix
clang-3.7: note: diagnostic msg: PLEASE submit a bug report to http://llvm.org/bugs/ and include the crash backtrace, preprocessed source, and associated run script.
clang-3.7: note: diagnostic msg: Error generating preprocessed source(s) - no preprocessable inputs.

What I’m I doing wrong?

Hi,

I'm using Clang/LLVM 3.7 and libclc from the repository to compile and
OpenCL kernel.

typedef float DATA_TYPE;

__kernel void gemm(__global DATA_TYPE *a, __global DATA_TYPE *b, __global
DATA_TYPE *c, DATA_TYPE alpha, DATA_TYPE beta, int ni, int nj, int nk)
{
        int j = get_global_id(0);
        int i = get_global_id(1);

        if ((i < ni) && (j < nj))
        {
                c[i * nj + j] *= beta;
                int k;
                for(k=0; k < nk; k++)
                {
                        c[i * nj + j] += alpha * a[i * nk + k] * b[k * nj
+j];
                }
        }
}

I'm doing it as follows:
clang -Dcl_clang_storage_class_specifiers -isystem libclc/generic/include
-include clc/clc.h -target amdgcn -S -emit-llvm -xcl -o gemm.ll gemm.cl
llvm-link /usr/local/lib/clc/hawaii-amdgcn--.bc gemm.ll -o gemm.linked.bc
clang -target amdgcn gemm.linked.bc -S -o gemm.hawaii.s

When I execute the third command, I get the following error:

Hi,

Did you build clang/llvm with cmake or autoconf? What configure arguments did you use?

-Tom

I used the binary distribution for ubuntu 64bit from the Clang website.

I did not compile it myself.

But if there is any special compilation flags I need to use (when compiling
from source) in order to make Clang work with libclc please do tell me :slight_smile:

I would recommend filing a bug with Ubuntu for this. I've never run into this
when I build clang myself. When you file the bug ask them how the configure
llvm/clang.

Thanks,
Tom