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Latest stable release:

February 12th, 2014 – Release 0.9.2 – panda-0.9.2.tar.gz.

New features introduced:

  • added an initial support to GCC 4.9.0,
  • stable support to GCC versions: v4.5, v4.6, v4.7 (default) and v4.8,
  • added an experimental support to Verilator simulator,
  • new dataflow dependency analysis for LOADs and STOREs; we now use GCC alias analysis to see if a LOAD and STORE pair or a STORE and STORE pair may conflict,
  • added a frontend step that optimizes PHI nodes,
  • added a frontend step that performs conditionally if conversions,
  • added a frontend step that performs simple code motions,
  • added a frontend step that converts if chains in a single multi-if control construct,
  • added a frontend step that simplifies short circuits based control constructs,
  • added a proxy-based approach to the LOADs/STOREs of statically resolved pointers,
  • improved EBR inference for Lattice based devices,
  • now, memory models are different for Lattice, Altera, Virtex5 and Virtex6-7 based devices,
  • updated FloPoCo to a more recent version,
  • now, register allocation maps storage values on registers without write enable when possible,
  • added support to CentOS/Scientific Linux distributions,
  • added support to ArchLinux distribution,
  • added support to Ubuntu 13.10 distribution,
  • now, testbenches accept a user defined error for float based computations; the error is specified in ULPs units; a Unit in the Last Place is the spacing between floating-point numbers,
  • improved architectural timing model,
  • added a very simple symbolic estimator of number of cycles taken by a function, it mainly covers function without loops and without unbounded operations,
  • general refactoring of automatic HLS testbench generation,
  • added support to libm function lceil and lceilf,
  • added skip-pipe-parameter option to bambu; it is is used to select a faster pipelined unit (xilinx devices have the default equal to 1 while lattice and altera devices have the default equal to 0),
  • improved memory allocation when byte-enabled write memories are not needed,
  • added support to variable lenght arrays,
  • added support to memalign builtin,
  • added EXT_PIPELINED_BRAM memory allocation policy, bambu with this option assumes that a block ram memory is allocated outside the core (LOAD with II=1 and latency=2 and STORE with latency=1),
  • added 2D matrix multiplication examples for integers and single precision floating point numbers,
  • added some synthesis scripts checking bambu quality of results w.r.t. 72 single precision libm functions (e.g., sqrtf, sinf, expf, tanhf, etc.),
  • added spider tool to automatically generate latex tables from bambu synthesis results,
  • moved all the dot generated files into directory HLS_output/dot/. Such files (scheduling, FSM, CFG, DFG, etc) are now generated when –print-dot option is passed,
  • VIVADO is now the default backend flow for Zynq based devices.

Problems fixed:

  • fixed all the Bison related compilation problems,
  • fixed some problems with testbench generation of 2D arrays,
  • fixed configuration scripts for manually installed Boost libraries; now, we need at least Boost 1.48.0,
  • fixed some problems with C pretty-printing of the internal IR,
  • fixed some ISE/Vivado synthesis problems when System Verilog based model are used,
  • fixed some problems with –soft-float based synthesis,
  • fixed RTL-backend configuration scripts looking for tools (e.g., ISE, Vivado, Quartus and Diamond) already installed,
  • fixed some problems with real-to-int and int-to-real conversions, added some explicit tests to the panda regressions.

Previous releases:

September 17th, 2013 – Release 0.9.1 – panda-0.9.1.tar.gz.

New features introduced:

  • complete support of CHSTone benchmarks synthesis and verification (link),
  • better support of multi-ported memories,
  • local memory exploitation,
  • read-only-memory exploitation,
  • support of multi-bus for parallel memory accesses,
  • support of unaligned memory accesses,
  • better support of pipelined resources,
  • improved module binding algorithms (e.g., slack-based module binding),
  • support of resource constraints through user xml file,
  • support of libc primitives: memcpy, memcmp, memset and memmove,
  • better support of printf primitive for RTL debugging purposes,
  • support of dynamic memory allocation,
  • synthesis of libm builtin primitives such as sin, cos, acosh, etc,
  • better integration with FloPoCo library (FloPoCo link),
  • soft-float based HW synthesis,
  • support of Vivado Xilinx backend,
  • support of Diamond Lattice backend,
  • support of XSIM Xilinx simulator,
  • synthesis and testbench generation of WISHBONE B4 Compliant Accelerators (see WB4 specs for details on the WISHBONE specification),
  • synthesis of AXI4LITE Compliant Accelerators (experimental),
  • inclusion of GCC regression tests to test HLS synthesis (tested HLS synthesis and RTL simulation),
  • inclusion of libm regression tests to test HLS synthesis of libm (tested HLS synthesis and RTL simulation),
  • support of multiple versions of GCC compiler: v4.5, v4.6 and v4.7.
  • support of GCC vectorizing capability (experimental).

March 21st, 2012 – Release 0.9.0 – Build 10722 – panda-0.9.0.tar.gz.

For any information or bug report, please write to panda-info@elet.polimi.it