TTA-Based Co-design Environment (TCE) v1.4 released

TTA-Based Co-design Environment (TCE) is a toolset for designing application-specific processors (ASP) based on the Transport Triggered Architecture (TTA). The toolset provides a complete retargetable co-design flow from C programs down to synthesizable VHDL and parallel program binaries. Processor customization points include the register files, function units, supported operations, and the interconnection network.

This release includes support for LLVM 2.9, some new VHDL implementations (an FPU and streaming operations), a connectivity optimizer, code generation improvements, plenty of bug fixes and more. See the CHANGES file for a more thorough listing.

Notable new features


- Support for LLVM 2.9.

- OpenCL Embedded compliant FPU implementations by Timo Viitanen / TUT

- Generic VHDL implementations for the basic streaming operations from Jani Boutellier / University of Oulu.

- ConnectionSweeper IC network exploration algorithm. Optimizes the IC network by sweeping the buses of the machine and removing the least important connections first until a cycle count worsening threshold is reached. Tries to remove RF connections first as they are usually more expensive than the bypass connections.

- Added --pareto_set switch to the explorer for printing pareto efficient configurations. Currently supports the connectivity and cycle count as the quality metrics.

- proge: IP-XACT support updated to version 1.5

- Added switch --print-resource-constraints to tcecc to assist in deciding which resources to add to the machine to improve the schedule. Dumps DDGs to dot files along with dependence and resource constraint analysis data.

Code generator improvements


- Passes the first function parameter in register instead of stack.

- Uses negative guard more aggressively, less stupid guard xoring operations.

- Emulation pattern generation improved, can use immediates directly when using DAG to emulate missing operations.

- Some other minor pattern improvements leading to slightly better code on some situations.

- Alias analysis improvements, understands that register spills to stack cannot alias with other memory operations

- Software Bypasser is much more aggressive.


---------------- Thanks to Timo Viitanen for your first TCE contribution (the OpenCL embedded-compliant FPU implementations) in this release!



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Pekka Jaaskelainen
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