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ROCm Blog

ROCm Blog Roll

ROCm Device Libraries Now Available!

We are pleased to announce fully open-source bitcode device libraries for the ROCm platform.

The following libraries are available:

  • Open Compute Math Library (OCML)—contains 250+ optimized math functions for single, double and half precision. See the OCML documentation for a list of currently supported functions.
  • Open Compute Kernel Library (OCKL)—contains many useful functions, including work-item/workgroup functions, integer optimization operations and wavefront reduce algorithms. It also serves as a foundation for the built-in library of the OpenCL-enabled compiler.
  • Compiler built-in library to support OpenCL.
  • Compiler built-in library for the HC mode of the Heterogeneous Compute Compiler (HCC).
  • OCLC libraries—enable fine-grain control over library modes (such as relaxed math).
  • IRIF—interface library to AMD GPU back end.

The libraries are intended for language and run-time implementors. They work with the open-source AMD GPU LLVM back end on GCN architectures and link to user bitcode through the LLVM linker before code generation.

ROCm-Device-Libs is currently under development, so we expect many improvements. As always, contributions and other feedback are welcome.

Quickly Access ROCm GPU Performance Counters via Radeon Compute Profiler

You can get the list of available counters by running the following command:

./rcprof --list

To save the counter list to a file, use

./rcprof --list --outputfile counters.txt

Next, specify the set of counters using the following command:

./rcprof --hsapmc --counterfile counters.txt

"counters.txt" should list one counter name per line.

HCC Adding Richer Array of Low-level Optimizations

  • 24-bit integer multiply and multiply-add (__mul24 and __mad24)
  • Intrinsics for ds_permute and ds_bpermute (__amdgcn_ds_permute and __amdgcn_ds_bpermute)
  • Intrinsics for ds_swizzle (__amdgcn_ds_swizzle)
  • Intrinsics for wave shift and rotate by one thread (_amdgcn_wave*)
  • Intrinsic for move dpp (__amdgcn_move_dpp)
  • Example of HCC Fuctions
unsigned int hc::__activelaneid_u32 () __HC__

Get the number of earlier (in flattened work-item order) active work items in the same wavefront.

uint64_t hc::__activelanemask_v4_b64_b1 (unsigned int input) __HC__

Return a bit mask showing which active work items in the wavefront have a nonzero input.

unsigned int hc::__activelanecount_u32_b1 (unsigned int input) __HC__

Count the number of active work items in the current wavefront that have a nonzero input.

unsigned int hc::__activelanepermute_b32 (unsigned int src, unsigned int laneId, unsigned int identity, unsigned int useIdentity) __HC__

Permute the active work items in the wavefront.

int hc::__any (int predicate) __HC__

Evaluate the predicate for all active work items in the wavefront and return a nonzero value if and only if every predicate evaluates to a nonzero value.

C++ int hc::__all (int predicate) __HC__

Evaluate the predicate for all active work items in the wavefront and return a nonzero value if and only if any one predicate evaluates to a nonzero value.

uint64_t hc::__ballot (int predicate) __HC__

Evaluate the predicate for all active work items in the wavefront and return an integer whose Nth bit is set if and only if the predicate evaluates to a nonzero value for the Nth work item of the wavefront and the Nth work item is active.

C++ unsigned int hc::__shfl_xor (unsigned int var, int laneMask, int width=__HSA_WAVEFRONT_SIZE__) __HC__

Find out more about these HCC fuctions.

It’s Time to ROC

<iframe width="560" height="315" src="https://www.youtube.com/embed/dnKDFci2x2Q" frameborder="0" allowfullscreen></iframe>

HPC User Forum in Tucson; Gregory Stoner from AMD presents It's Time to ROC and overivew on ROCm SOftware Platform.