Tangram: a High-level Language for Performance Portable Code Synthesis

Li-Wen Chang, Abdul Dakkak, Christopher I. Rodrigues, Wen-mei Hwu
University of Illinois, Urbana, IL USA
Eighth Workshop on Programmability Issues for Heterogeneous Multicores (MULTIPROG-2015), 2015


   title={Tangram: a High-level Language for Performance Portable Code Synthesis},

   author={Chang, Li-Wen and Dakkak, Abdul and Rodrigues, Christopher I and Hwu, Wen-mei},



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We propose Tangram, a general-purpose high-level language that achieves high performance across architectures. In Tangram, a program is written by synthesizing elemental pieces of code snippets, called codelets. A codelet can have multiple semantic-preserving implementations to enable automated algorithm and implementation selection. An implementation of a codelet can be written with tunable knobs to allow architecture-specific parameterization. The Tangram compiler produces highly optimized code by choosing and composing architecture-friendly codelets, and then tuning the knobs for the target architecture. We demonstrate that Tangram’s synthesized programs are comparable in performance to existing well-optimized codes on both CPUs and GPUs. The language is defined in a concise and maintainable way to improve debuggability and to enable progressive improvement. This strategy allows users to extend their applications and achieves higher performance on existing architectures and new architectures.
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