TDS decompose bug 119
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This debugging session document summarizes fixing bug 119 in TDS software. The bug occurred when decomposing polynomials, where the top node of the removed chain was losing its backpointer information during the ted2dfg conversion. The solution was to copy the backpointer for the top node as well, matching the rest of the internal nodes. This ensured the full chain maintained connections when decomposed terms were removed.
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Design of an Embedded Micro controller
This document describes the design of a softcore microcontroller called UMASS-core that is implemented in an FPGA. The UMASS-core is based on the Microchip PIC16F84 8-bit microcontroller architecture but adds some additional features. It is written in VHDL and synthesized for a Spartan3 FPGA. The goal is to provide designers flexibility to customize the microcontroller configuration while maintaining compatibility with PIC16F84 assembly code.
TDS Manual
This document describes the Taylor Decomposition System (TDS) data structures and optimization flow. TDS contains three main data structures - the Taylor Expansion Diagram (TED) which represents the algorithmic behavior, the Data Flow Graph (DFG) which visualizes the TED, and the Netlist (NTL) which interfaces with high-level synthesis tools. TDS takes in C/C++ designs through tools like GAUT, performs optimizations on the TED and DFG, and outputs optimized netlists to the synthesis tools for further processing and output of HDL code.
Brief GAUT tutorial
This document discusses the GAUT digital synthesis tool. It describes GAUT's main window which allows compiling C code to a control/data flow graph (CDFG) and then synthesizing the CDFG to VHDL. The CDFG to VHDL synthesis can generate registers and muxes in the VHDL output based on the specified pipeline cadence. Pipelining is not allowed if the new cadence is not a multiple of the clock cycle.
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The document outlines data structures and algorithms, including analysis of complexity, common data structures like arrays, stacks, queues, linked lists, and sorting algorithms like merge sort and quick sort. It provides an overview of these topics along with examples of analyzing time complexity using Big-O notation.
Basic data structures part I
Stacks follow the LIFO (last in, first out) principle. They are commonly implemented using arrays, where elements are pushed and popped from one end of the array to enforce the LIFO behavior. This overrides the random access of regular arrays. Common stack operations include push to add an element, pop to remove the top element, peek to access the top element without removing it, and checks for empty or full stacks. Stacks have many applications like function calls, undo/redo operations, parsing expressions etc.
TDS Bug 221
This document describes debugging a reordering bug in the TDS software. The bug caused reordering to abort at 4% completion. By analyzing debug files, the author isolated the bug to an issue when nodes ai_12 and ai_4 were being swapped. The author then developed techniques like "print_cone" to reduce the test case size. Further analysis using visualization tools revealed the bug was caused by dangling node references during recursive reordering of parent nodes. The solution was to reorder nodes in a levelized manner to avoid reference issues.
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- 1. Debugging TDS decompose bug 119 Fixed v107 By Daniel Gomez-Prado 11/18/2009 Disclaimer: This is not a tutorial. This is a debugging session for anyone working on TDS http://www.dgomezpr.com/
- 2. Bug 119 at rev 106..107 on 09/11/18 Trigger cmd: decompose Tds 01> poly a^2*b-3*a*c-d Tds 02> linearize Tds 03> decompose productTerm() sumTerm() ? PT nodes do not have backptrs ??, therefore In ted2dfg we can’t traverse all the TED Tds 04> ted2dfg Tds05> show -d ? Fixed on ver 107
- 3. Problem The top of the chain was losing the backptr infomation TedDecompose::updateReplecatedTermReference() All internal TedNodes of the removed chain from the manager, where being inserted duplicating its backptr information. All but one, the top TedNode of the chain, thus the error.
- 4. Solution: 1. Copy the backptr information for the top of the chain as well