The document discusses the process of compilation. It has 4 main steps - lexical analysis, syntactic analysis, intermediate code generation, and code generation.
In lexical analysis, the source code is scanned and broken into basic elements like identifiers, literals, and symbols. Tables are created to store this tokenized information.
Syntactic analysis recognizes syntactic constructs and interprets their meaning. It checks for syntactic errors. Intermediate code like a parse tree or matrix is generated to represent the program.
Storage is allocated to variables during intermediate code generation. Optimization techniques are also applied at this stage.
Finally, machine code is generated from the intermediate representation based on tables containing code templates. Assembly code is then produced to resolve references
This document discusses single pass assemblers. It notes that single pass assemblers scan a program once to create the equivalent binary, substituting symbolic instructions with machine code. However, this can cause forward reference problems when symbols are used before being defined. The document describes two solutions for single pass assemblers: 1) eliminating forward references by defining all labels before use or prohibiting forward data references, and 2) generating object code directly in memory without writing to disk, requiring reassembly each time.
The document discusses macro processors, compilers, and interpreters. It provides details on:
- The phases of a compiler including lexical analysis, syntax analysis, semantic analysis, intermediate code generation, code optimization, and code generation.
- Macro processors which take source code with macro definitions and calls and replace calls with macro bodies. This includes details on macro expansion, formal/actual parameters, and nested macro calls.
- The design of a macro preprocessor which accepts assembly code with macros and removes macros to generate assembly without macros.
- How compilers translate programs written in a source language into an equivalent program in a target language through various analysis and synthesis phases.
E-MAIL, IP & WEB SECURITY
E-mail Security: Security Services for E-mail-attacks possible through E-mail – establishing keys privacy-authentication of the source-Message Integrity-Non-repudiation-Pretty Good Privacy-S/MIME. IPSecurity: Overview of IPSec – IP and IPv6-Authentication Header-Encapsulation Security Payload (ESP)-Internet Key Exchange (Phases of IKE, ISAKMP/IKE Encoding). Web Security:
Description of all types of Loaders from System programming subjects.
eg. Compile-Go Loader
General Loader
Absolute Loader
Relocating Loader
Practical Relocating Loader
Linking Loader
Linker Vs. Loader
general relocatable loader
The document discusses compilers and their role in translating high-level programming languages into machine-readable code. It notes that compilers perform several key functions: lexical analysis, syntax analysis, generation of an intermediate representation, optimization of the intermediate code, and finally generation of assembly or machine code. The compiler allows programmers to write code in a high-level language that is easier for humans while still producing efficient low-level code that computers can execute.
The document summarizes the key aspects of direct linking loaders. A direct linking loader allows for multiple procedure and data segments and flexible intersegment referencing. It provides assembler output with the length and symbol tables (USE and DEFINITION) to the loader. The loader performs two passes, building a Global External Symbol Table in Pass 1 and performing relocation and linking in Pass 2 using the object decks with External Symbol Dictionary, instructions/data, and relocation/linkage sections. This allows combining and executing object code from separate object programs.
An assembler is a program that converts assembly language code into machine language code. It has two passes: in the first pass, it scans the program and builds a symbol table with label addresses; in the second pass, it converts instructions to machine language using the symbol table and builds the executable image. The assembler converts mnemonics to operation codes, symbolic operands to addresses, builds instructions, converts data, and writes the object program and listing. The linker then resolves symbols between object files before the loader copies the executable into memory and relocates it as needed. The assembler uses symbol tables from both passes and databases to perform its functions of translating and building the executable.
This document discusses single pass assemblers. It notes that single pass assemblers scan a program once to create the equivalent binary, substituting symbolic instructions with machine code. However, this can cause forward reference problems when symbols are used before being defined. The document describes two solutions for single pass assemblers: 1) eliminating forward references by defining all labels before use or prohibiting forward data references, and 2) generating object code directly in memory without writing to disk, requiring reassembly each time.
The document discusses macro processors, compilers, and interpreters. It provides details on:
- The phases of a compiler including lexical analysis, syntax analysis, semantic analysis, intermediate code generation, code optimization, and code generation.
- Macro processors which take source code with macro definitions and calls and replace calls with macro bodies. This includes details on macro expansion, formal/actual parameters, and nested macro calls.
- The design of a macro preprocessor which accepts assembly code with macros and removes macros to generate assembly without macros.
- How compilers translate programs written in a source language into an equivalent program in a target language through various analysis and synthesis phases.
E-MAIL, IP & WEB SECURITY
E-mail Security: Security Services for E-mail-attacks possible through E-mail – establishing keys privacy-authentication of the source-Message Integrity-Non-repudiation-Pretty Good Privacy-S/MIME. IPSecurity: Overview of IPSec – IP and IPv6-Authentication Header-Encapsulation Security Payload (ESP)-Internet Key Exchange (Phases of IKE, ISAKMP/IKE Encoding). Web Security:
Description of all types of Loaders from System programming subjects.
eg. Compile-Go Loader
General Loader
Absolute Loader
Relocating Loader
Practical Relocating Loader
Linking Loader
Linker Vs. Loader
general relocatable loader
The document discusses compilers and their role in translating high-level programming languages into machine-readable code. It notes that compilers perform several key functions: lexical analysis, syntax analysis, generation of an intermediate representation, optimization of the intermediate code, and finally generation of assembly or machine code. The compiler allows programmers to write code in a high-level language that is easier for humans while still producing efficient low-level code that computers can execute.
The document summarizes the key aspects of direct linking loaders. A direct linking loader allows for multiple procedure and data segments and flexible intersegment referencing. It provides assembler output with the length and symbol tables (USE and DEFINITION) to the loader. The loader performs two passes, building a Global External Symbol Table in Pass 1 and performing relocation and linking in Pass 2 using the object decks with External Symbol Dictionary, instructions/data, and relocation/linkage sections. This allows combining and executing object code from separate object programs.
An assembler is a program that converts assembly language code into machine language code. It has two passes: in the first pass, it scans the program and builds a symbol table with label addresses; in the second pass, it converts instructions to machine language using the symbol table and builds the executable image. The assembler converts mnemonics to operation codes, symbolic operands to addresses, builds instructions, converts data, and writes the object program and listing. The linker then resolves symbols between object files before the loader copies the executable into memory and relocates it as needed. The assembler uses symbol tables from both passes and databases to perform its functions of translating and building the executable.
The document discusses the Liang-Barsky line clipping algorithm, an algorithm used to clip lines to a rectangular viewing area. It is covered by Arvind Kumar, an assistant professor at Vidya College of Engineering. As an example, the line clipping algorithm is shown clipping a line with endpoints (22.5,15) and (25,16).
The document discusses loaders, which are system software programs that perform the loading function of placing a program into memory for execution. There are several types of loaders: compile-and-go loaders directly place assembled code into memory; absolute loaders place code at specified addresses; relocating loaders allow code to be loaded at different addresses and combine programs. Relocating loaders output object code, symbol tables, and relocation information to perform allocation, relocation, linking, and loading separately from assembly. Direct-linking loaders provide more flexibility by allowing multiple program and data segments with intersegment references.
The document discusses machine structure and system programming. It begins with an overview of system software components like assemblers, loaders, macros, compilers and formal systems. It then describes the general machine structure including CPU, memory and I/O channels. Specific details are provided about the IBM 360 machine structure including its memory, registers, data, instructions and special features. Machine language and different approaches to writing machine language programs are also summarized.
Introduction, Macro Definition and Call, Macro Expansion, Nested Macro Calls, Advanced Macro Facilities, Design Of a Macro Preprocessor, Design of a Macro Assembler, Functions of a Macro Processor, Basic Tasks of a Macro Processor, Design Issues of Macro Processors, Features, Macro Processor Design Options, Two-Pass Macro Processors, One-Pass Macro Processors
LEX is a tool that allows users to specify a lexical analyzer by defining patterns for tokens using regular expressions. The LEX compiler transforms these patterns into a transition diagram and generates C code. It takes a LEX source program as input, compiles it to produce lex.yy.c, which is then compiled with a C compiler to generate an executable that takes an input stream and returns a sequence of tokens. LEX programs have declarations, translation rules that map patterns to actions, and optional auxiliary functions. The actions are fragments of C code that execute when a pattern is matched.
(Ref : Computer System Architecture by Morris Mano 3rd edition) : Microprogrammed Control unit, micro instructions, micro operations, symbolic and binary microprogram.
The document discusses the design of a two-pass macro preprocessor. In pass one, macro definitions are identified and stored in a macro definition table along with their parameters. A macro name table is also created. In pass two, macro calls are identified and replaced by retrieving the corresponding macro definition and substituting actual parameters for formal parameters using an argument list array. Databases like the macro definition table, macro name table, and argument list array are used to store and retrieve macro information to enable expansion of macro calls. The algorithm scans the input sequentially in each pass to process macro definitions and calls.
There are two main types of assemblers: one-pass and multi-pass assemblers. A two-pass assembler with an overlay structure can be used for small memory systems by separating the code and data for each pass. One-pass assemblers deal with forward references by either requiring data definitions come before uses or inserting undefined symbols into a table. Load-and-go one-pass assemblers generate code directly into memory. Multi-pass assemblers restrict forward references on the first pass and use linking to resolve them later.
loader and linker are both system software which capable of loads the object code, assembled by an assembler, (loader) and link a different kind of block of a huge program. both software works at the bottom of the operation (i.e. closer to the hardware). in fact, both have machine dependent and independent features.
This document provides information about the CS416 Compiler Design course, including the instructor details, prerequisites, textbook, grading breakdown, course outline, and an overview of the major parts and phases of a compiler. The course will cover topics such as lexical analysis, syntax analysis using top-down and bottom-up parsing, semantic analysis using attribute grammars, intermediate code generation, code optimization, and code generation.
This document discusses macros and macro processing. It defines macros as units of code abbreviation that are expanded during compilation. The macro processor performs two passes: pass 1 reads macros and stores them in a table, pass 2 expands macros by substituting actual parameters. Advanced features like conditional expansion and looping are enabled using statements like AIF, AGO, and ANOP. Nested macro calls follow a LIFO expansion order.
The document discusses various aspects of assembler design and implementation including:
1) The basic functions of an assembler in translating mnemonic codes to machine language and assigning addresses to symbols.
2) Machine-dependent features like different instruction formats and addressing modes, and how programs are relocated during assembly.
3) Machine-independent features including the use of literals, symbol-defining statements, expressions, program blocks, and linking of control sections between programs.
This document provides an overview of compiler design, including:
- The history and importance of compilers in translating high-level code to machine-level code.
- The main components of a compiler including the front-end (analysis), back-end (synthesis), and tools used in compiler construction.
- Key phases of compilation like lexical analysis, syntax analysis, semantic analysis, code optimization, and code generation.
- Types of translators like interpreters, assemblers, cross-compilers and their functions.
- Compiler construction tools that help generate scanners, parsers, translation engines, code generators, and data flow analysis.
The document discusses issues in code generation by a compiler. It defines code generation as converting an intermediate representation into executable machine code. The code generator accesses symbol tables and performs multiple passes over intermediate forms. Key issues addressed include the input to the code generator, generating code for the target machine, memory management, instruction selection, register allocation, and optimization techniques like reordering independent instructions to improve efficiency.
System programming involves designing and implementing system programs like operating systems, compilers, linkers, and loaders that allow user programs to run efficiently on a computer system. A key part of system programming is developing system software like operating systems, assemblers, compilers, and debuggers. An operating system acts as an interface between the user and computer hardware, managing processes, memory, devices, and files. Assemblers and compilers translate programs into machine-readable code. Loaders place object code into memory for execution. System programming optimizes computer system performance and resource utilization.
The document discusses the functions of an assembler. An assembler takes an assembly language program as input and produces a machine language program and additional information as output. It performs two passes over the input source program. In the first pass, it processes directives and defines symbols. In the second pass, it generates the machine language program. The assembler uses tables like the symbol table, machine opcode table, and pseudo opcode table to process instructions and directives. It also uses data structures like the location counter, literal table, and base table to track information during the assembly process.
Macros allow programmers to define abbreviations for sequences of instructions. A macro definition specifies the macro name and the sequence of instructions to be abbreviated. When a macro is called, it is expanded by replacing the macro name with the defined sequence of instructions. Macros can call other macros, requiring macro processors to handle nested macro expansion. Macro processors implement macros using a single or double pass approach to first save macro definitions and then expand macro calls by substituting argument values.
The document discusses the Liang-Barsky line clipping algorithm, an algorithm used to clip lines to a rectangular viewing area. It is covered by Arvind Kumar, an assistant professor at Vidya College of Engineering. As an example, the line clipping algorithm is shown clipping a line with endpoints (22.5,15) and (25,16).
The document discusses loaders, which are system software programs that perform the loading function of placing a program into memory for execution. There are several types of loaders: compile-and-go loaders directly place assembled code into memory; absolute loaders place code at specified addresses; relocating loaders allow code to be loaded at different addresses and combine programs. Relocating loaders output object code, symbol tables, and relocation information to perform allocation, relocation, linking, and loading separately from assembly. Direct-linking loaders provide more flexibility by allowing multiple program and data segments with intersegment references.
The document discusses machine structure and system programming. It begins with an overview of system software components like assemblers, loaders, macros, compilers and formal systems. It then describes the general machine structure including CPU, memory and I/O channels. Specific details are provided about the IBM 360 machine structure including its memory, registers, data, instructions and special features. Machine language and different approaches to writing machine language programs are also summarized.
Introduction, Macro Definition and Call, Macro Expansion, Nested Macro Calls, Advanced Macro Facilities, Design Of a Macro Preprocessor, Design of a Macro Assembler, Functions of a Macro Processor, Basic Tasks of a Macro Processor, Design Issues of Macro Processors, Features, Macro Processor Design Options, Two-Pass Macro Processors, One-Pass Macro Processors
LEX is a tool that allows users to specify a lexical analyzer by defining patterns for tokens using regular expressions. The LEX compiler transforms these patterns into a transition diagram and generates C code. It takes a LEX source program as input, compiles it to produce lex.yy.c, which is then compiled with a C compiler to generate an executable that takes an input stream and returns a sequence of tokens. LEX programs have declarations, translation rules that map patterns to actions, and optional auxiliary functions. The actions are fragments of C code that execute when a pattern is matched.
(Ref : Computer System Architecture by Morris Mano 3rd edition) : Microprogrammed Control unit, micro instructions, micro operations, symbolic and binary microprogram.
The document discusses the design of a two-pass macro preprocessor. In pass one, macro definitions are identified and stored in a macro definition table along with their parameters. A macro name table is also created. In pass two, macro calls are identified and replaced by retrieving the corresponding macro definition and substituting actual parameters for formal parameters using an argument list array. Databases like the macro definition table, macro name table, and argument list array are used to store and retrieve macro information to enable expansion of macro calls. The algorithm scans the input sequentially in each pass to process macro definitions and calls.
There are two main types of assemblers: one-pass and multi-pass assemblers. A two-pass assembler with an overlay structure can be used for small memory systems by separating the code and data for each pass. One-pass assemblers deal with forward references by either requiring data definitions come before uses or inserting undefined symbols into a table. Load-and-go one-pass assemblers generate code directly into memory. Multi-pass assemblers restrict forward references on the first pass and use linking to resolve them later.
loader and linker are both system software which capable of loads the object code, assembled by an assembler, (loader) and link a different kind of block of a huge program. both software works at the bottom of the operation (i.e. closer to the hardware). in fact, both have machine dependent and independent features.
This document provides information about the CS416 Compiler Design course, including the instructor details, prerequisites, textbook, grading breakdown, course outline, and an overview of the major parts and phases of a compiler. The course will cover topics such as lexical analysis, syntax analysis using top-down and bottom-up parsing, semantic analysis using attribute grammars, intermediate code generation, code optimization, and code generation.
This document discusses macros and macro processing. It defines macros as units of code abbreviation that are expanded during compilation. The macro processor performs two passes: pass 1 reads macros and stores them in a table, pass 2 expands macros by substituting actual parameters. Advanced features like conditional expansion and looping are enabled using statements like AIF, AGO, and ANOP. Nested macro calls follow a LIFO expansion order.
The document discusses various aspects of assembler design and implementation including:
1) The basic functions of an assembler in translating mnemonic codes to machine language and assigning addresses to symbols.
2) Machine-dependent features like different instruction formats and addressing modes, and how programs are relocated during assembly.
3) Machine-independent features including the use of literals, symbol-defining statements, expressions, program blocks, and linking of control sections between programs.
This document provides an overview of compiler design, including:
- The history and importance of compilers in translating high-level code to machine-level code.
- The main components of a compiler including the front-end (analysis), back-end (synthesis), and tools used in compiler construction.
- Key phases of compilation like lexical analysis, syntax analysis, semantic analysis, code optimization, and code generation.
- Types of translators like interpreters, assemblers, cross-compilers and their functions.
- Compiler construction tools that help generate scanners, parsers, translation engines, code generators, and data flow analysis.
The document discusses issues in code generation by a compiler. It defines code generation as converting an intermediate representation into executable machine code. The code generator accesses symbol tables and performs multiple passes over intermediate forms. Key issues addressed include the input to the code generator, generating code for the target machine, memory management, instruction selection, register allocation, and optimization techniques like reordering independent instructions to improve efficiency.
System programming involves designing and implementing system programs like operating systems, compilers, linkers, and loaders that allow user programs to run efficiently on a computer system. A key part of system programming is developing system software like operating systems, assemblers, compilers, and debuggers. An operating system acts as an interface between the user and computer hardware, managing processes, memory, devices, and files. Assemblers and compilers translate programs into machine-readable code. Loaders place object code into memory for execution. System programming optimizes computer system performance and resource utilization.
The document discusses the functions of an assembler. An assembler takes an assembly language program as input and produces a machine language program and additional information as output. It performs two passes over the input source program. In the first pass, it processes directives and defines symbols. In the second pass, it generates the machine language program. The assembler uses tables like the symbol table, machine opcode table, and pseudo opcode table to process instructions and directives. It also uses data structures like the location counter, literal table, and base table to track information during the assembly process.
Macros allow programmers to define abbreviations for sequences of instructions. A macro definition specifies the macro name and the sequence of instructions to be abbreviated. When a macro is called, it is expanded by replacing the macro name with the defined sequence of instructions. Macros can call other macros, requiring macro processors to handle nested macro expansion. Macro processors implement macros using a single or double pass approach to first save macro definitions and then expand macro calls by substituting argument values.
A loader performs key functions like allocating memory, relocating addresses, linking between object files, and loading programs into memory for execution. Different loading schemes are used depending on the needs of the system and programming language. Direct linking loaders allow for relocatable code and external references between program segments through the use of object file records and tables for symbols, relocation, and code loading.
The document discusses various object-oriented modeling concepts including objects, classes, attributes, operations, associations, generalization, and aggregation. It provides examples and definitions for each concept. Key topics covered include the definition of objects and classes, class diagrams showing attributes and operations, association types like one-to-one and many-to-many, using roles in associations, and the differences between aggregation and generalization relationships.
The document discusses parsing and context-free grammars. It defines parsing as constructing a parse tree from a stream of tokens using the rules of a context-free grammar. It provides examples of parse trees being built from both top-down and bottom-up parsing approaches. Key aspects of context-free grammars like non-terminals, terminals, production rules, and the start symbol are also summarized.
This document discusses system software and its evolution. It defines system software as programs designed to operate and control computer hardware, with examples being operating systems and assemblers. Application software enables users to complete tasks. There are two main types of system software components: macros, which expand instructions to perform tasks, and assemblers, which translate programs into machine code. The document then outlines the evolution of system software from early machine code programming to modern operating systems with features like paging, virtual memory, and time sharing to better manage resources and improve efficiency.
This document provides an overview of activity diagrams and state chart diagrams. It describes the key elements of each, including:
- For activity diagrams: activities, actions, transitions, decisions, synchronization bars, start/end points. Activity diagrams are used to model business processes and workflow.
- For state chart diagrams: states, transitions, events, initial/final states. State chart diagrams are used to model the lifetime of an object and the different states it can be in.
The document defines each element, provides examples, and explains how they are graphically represented in UML diagrams. It also discusses concepts like concurrent states, history states, and swimlanes.
- A component diagram shows the organization and dependencies among physical software components, including source code, runtime code, and executables. It addresses the static implementation view of a system and represents high-level reusable parts.
- The key elements are components, interfaces, ports, and connectors. Components provide and require interfaces. Interfaces can be attached to ports, which control component interactions. Connectors link components through ports or interfaces.
- A deployment diagram models the physical deployment of artifacts across nodes like hardware. It shows the configuration of runtime processing nodes and the artifacts deployed on them, such as executable files, libraries, and tables.
This document discusses various techniques for code optimization at the compiler level. It begins by defining code optimization and explaining that it aims to make a program more efficient by reducing resources like time and memory usage. Several common optimization techniques are then described, including common subexpression elimination, dead code elimination, and loop optimization. Common subexpression elimination removes redundant computations. Dead code elimination removes code that does not affect program output. Loop optimization techniques like removing loop invariants and induction variables can improve loop performance. The document provides examples to illustrate how each technique works.
The macro processor detects macro triggers like % and & in the code and handles macro code and variable substitution. It stores macro variables and their values in a symbol table. When it detects a macro variable reference &variable, it looks up the variable name in the symbol table and substitutes the variable value into the code before passing it to the compiler. This allows macros to generate dynamic code with variable data.
This document provides an introduction to programming in GWBASIC. It discusses that GWBASIC is a good starting point for beginners as it is easy to learn and has graphics capabilities. The key building blocks of a GWBASIC program are numbered line statements that contain variables, constants, operations, and control structures. The document outlines various statements and programming concepts in GWBASIC including numeric constants, variables, operations, control structures, input/output, and functions. It provides syntax examples for many of these programming elements.
This document provides an overview of how compilers work by summarizing their main components and processes. It explains that a compiler translates a program written in a high-level language into an equivalent program in a lower-level language. The compilation process involves two main stages - analysis and synthesis. Analysis breaks down the source code and generates an intermediate representation, while synthesis constructs the target program from that representation. Key phases in each stage, such as lexical analysis, parsing, code generation and optimization, are also outlined.
This document discusses using the CALL SYMPUT routine to transfer information between DATA step program steps. It provides three examples: 1) creating dummy variables for all possible values of a variable, 2) generating labels for variables using existing formats, and 3) using the BYTE function to assign alphabetically ordered names to datasets created from raw data files. CALL SYMPUT assigns values produced in a DATA step to macro variables, allowing dynamic communication between SAS language and macros.
Chapter 16-spreadsheet1 questions and answerRaajTech
This document discusses spreadsheets and Excel. It defines key spreadsheet concepts like workbooks, cells, cell addresses, and formulas. It describes built-in Excel functions for date/time, arithmetic, statistical, logical, and financial calculations. The document also covers charts, macros, and databases in Excel. Spreadsheets allow users to enter, manipulate, and analyze numerical data using formulas and functions in a tabular format.
program for conditional statements
to perform matrices (addition & multiplication)
demonstration of programs for array function
to perform mail merge
use of excel by basic excel formulas
The document discusses code generation techniques in compiler construction. It covers generating code for control structures like if-statements and while-loops, as well as addressing techniques for data structures like arrays. Intermediate representations like three-address code and P-code are used. Label generation and back-patching allow jumps to not-yet defined code locations.
The document discusses code generation which involves mapping intermediate code to machine code. It describes three key issues in code generator design: instruction selection which determines the best machine instructions to use, register allocation which assigns variables to registers, and evaluation order which determines the order of instructions. The document outlines three algorithms for code generation that involve partitioning code into basic blocks, performing intra-block optimizations, and code selection and assignment.
Macros allow programmers to define single instructions that represent a block of code. A macro processor performs macro expansion by replacing macro calls with the corresponding sequence of instructions defined in the macro. Key features of macro facilities include the ability to define macros with arguments and perform conditional macro expansion. A two-pass macro processor first recognizes and saves macro definitions, then identifies macro calls and performs argument substitution and expansion.
This document discusses embedded programming and is divided into several sections. It begins by stating the objectives and describing the target system. It then covers the main components of an embedded program including finite state machines, circular buffers, and queues. Different models of program design are explained such as C-text, data flow graphs, and control-data flow graphs. Finally, it discusses the processes of assembly, linking, and loading which involve generating symbol tables, combining object modules, and resolving addresses across modules in two phases.
Pragmatic Optimization in Modern Programming - Demystifying the CompilerMarina Kolpakova
This document discusses compiler optimizations. It begins with an outline of topics including compilation trajectory, intermediate languages, optimization levels, and optimization techniques. It then provides more details on each phase of compilation, how compilers use intermediate representations to perform optimizations, and specific optimizations like common subexpression elimination, constant propagation, and instruction scheduling.
The document discusses the phases of a compiler including lexical analysis, syntax analysis, semantic analysis, intermediate code generation, code optimization, and code generation. It describes the role of the lexical analyzer in translating source code into tokens. Key aspects covered include defining tokens and lexemes, using patterns and attributes to classify tokens, and strategies for error recovery in lexical analysis such as buffering input.
Star Transformation, 12c Adaptive Bitmap Pruning and In-Memory optionFranck Pachot
Besides adaptive joins and adaptive parallel distribution, 12c comes with Adaptive Bitmap Pruning. I’ll describe the case it applies to and which is often not well known: the Star Transformation
The document provides an overview of Verilog, including:
1) Why HDLs like Verilog are needed for designing large, complex hardware systems.
2) Basic Verilog syntax such as modules, ports, parameters, nets, registers, operators, assignments.
3) How to model hardware features in Verilog like combinational logic, sequential logic, timing, case statements.
This document provides an introduction to the analysis of algorithms. It defines an algorithm and lists key properties including being finite, definite, and able to produce the correct output for any valid input. Common computational problems and basic algorithm design strategies are outlined. Asymptotic notations for analyzing time and space efficiency are introduced. Examples of algorithms for calculating the greatest common divisor and determining if a number is prime are provided and analyzed. Fundamental data structures and techniques for analyzing recursive algorithms are also discussed.
This document discusses assemblers and assembly language. It defines an assembler as a program that accepts assembly language as input and translates it into machine language. It describes the main components of assembly language statements, including labels, mnemonics, operands, and different statement types. It also explains the different data structures used by assemblers, including symbol tables, mnemonic tables, and location counters. Finally, it discusses the two-pass structure of assemblers, how they generate intermediate code on the first pass and then use that to resolve forward references and completely synthesize instructions on the second pass.
In this PPT we covered all the points like..Introduction to compilers - Design issues, passes, phases, symbol table
Preliminaries - Memory management, Operating system support for compiler, Compiler support for garbage collection ,Lexical Analysis - Tokens, Regular Expressions, Process of Lexical analysis, Block Schematic, Automatic construction of lexical analyzer using LEX, LEX features and specification.
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Redefining brain tumor segmentation: a cutting-edge convolutional neural netw...IJECEIAES
Medical image analysis has witnessed significant advancements with deep learning techniques. In the domain of brain tumor segmentation, the ability to
precisely delineate tumor boundaries from magnetic resonance imaging (MRI)
scans holds profound implications for diagnosis. This study presents an ensemble convolutional neural network (CNN) with transfer learning, integrating
the state-of-the-art Deeplabv3+ architecture with the ResNet18 backbone. The
model is rigorously trained and evaluated, exhibiting remarkable performance
metrics, including an impressive global accuracy of 99.286%, a high-class accuracy of 82.191%, a mean intersection over union (IoU) of 79.900%, a weighted
IoU of 98.620%, and a Boundary F1 (BF) score of 83.303%. Notably, a detailed comparative analysis with existing methods showcases the superiority of
our proposed model. These findings underscore the model’s competence in precise brain tumor localization, underscoring its potential to revolutionize medical
image analysis and enhance healthcare outcomes. This research paves the way
for future exploration and optimization of advanced CNN models in medical
imaging, emphasizing addressing false positives and resource efficiency.
Electric vehicle and photovoltaic advanced roles in enhancing the financial p...IJECEIAES
Climate change's impact on the planet forced the United Nations and governments to promote green energies and electric transportation. The deployments of photovoltaic (PV) and electric vehicle (EV) systems gained stronger momentum due to their numerous advantages over fossil fuel types. The advantages go beyond sustainability to reach financial support and stability. The work in this paper introduces the hybrid system between PV and EV to support industrial and commercial plants. This paper covers the theoretical framework of the proposed hybrid system including the required equation to complete the cost analysis when PV and EV are present. In addition, the proposed design diagram which sets the priorities and requirements of the system is presented. The proposed approach allows setup to advance their power stability, especially during power outages. The presented information supports researchers and plant owners to complete the necessary analysis while promoting the deployment of clean energy. The result of a case study that represents a dairy milk farmer supports the theoretical works and highlights its advanced benefits to existing plants. The short return on investment of the proposed approach supports the paper's novelty approach for the sustainable electrical system. In addition, the proposed system allows for an isolated power setup without the need for a transmission line which enhances the safety of the electrical network
Advanced control scheme of doubly fed induction generator for wind turbine us...IJECEIAES
This paper describes a speed control device for generating electrical energy on an electricity network based on the doubly fed induction generator (DFIG) used for wind power conversion systems. At first, a double-fed induction generator model was constructed. A control law is formulated to govern the flow of energy between the stator of a DFIG and the energy network using three types of controllers: proportional integral (PI), sliding mode controller (SMC) and second order sliding mode controller (SOSMC). Their different results in terms of power reference tracking, reaction to unexpected speed fluctuations, sensitivity to perturbations, and resilience against machine parameter alterations are compared. MATLAB/Simulink was used to conduct the simulations for the preceding study. Multiple simulations have shown very satisfying results, and the investigations demonstrate the efficacy and power-enhancing capabilities of the suggested control system.
Introduction- e - waste – definition - sources of e-waste– hazardous substances in e-waste - effects of e-waste on environment and human health- need for e-waste management– e-waste handling rules - waste minimization techniques for managing e-waste – recycling of e-waste - disposal treatment methods of e- waste – mechanism of extraction of precious metal from leaching solution-global Scenario of E-waste – E-waste in India- case studies.
Comparative analysis between traditional aquaponics and reconstructed aquapon...bijceesjournal
The aquaponic system of planting is a method that does not require soil usage. It is a method that only needs water, fish, lava rocks (a substitute for soil), and plants. Aquaponic systems are sustainable and environmentally friendly. Its use not only helps to plant in small spaces but also helps reduce artificial chemical use and minimizes excess water use, as aquaponics consumes 90% less water than soil-based gardening. The study applied a descriptive and experimental design to assess and compare conventional and reconstructed aquaponic methods for reproducing tomatoes. The researchers created an observation checklist to determine the significant factors of the study. The study aims to determine the significant difference between traditional aquaponics and reconstructed aquaponics systems propagating tomatoes in terms of height, weight, girth, and number of fruits. The reconstructed aquaponics system’s higher growth yield results in a much more nourished crop than the traditional aquaponics system. It is superior in its number of fruits, height, weight, and girth measurement. Moreover, the reconstructed aquaponics system is proven to eliminate all the hindrances present in the traditional aquaponics system, which are overcrowding of fish, algae growth, pest problems, contaminated water, and dead fish.
KuberTENes Birthday Bash Guadalajara - K8sGPT first impressionsVictor Morales
K8sGPT is a tool that analyzes and diagnoses Kubernetes clusters. This presentation was used to share the requirements and dependencies to deploy K8sGPT in a local environment.
Embedded machine learning-based road conditions and driving behavior monitoringIJECEIAES
Car accident rates have increased in recent years, resulting in losses in human lives, properties, and other financial costs. An embedded machine learning-based system is developed to address this critical issue. The system can monitor road conditions, detect driving patterns, and identify aggressive driving behaviors. The system is based on neural networks trained on a comprehensive dataset of driving events, driving styles, and road conditions. The system effectively detects potential risks and helps mitigate the frequency and impact of accidents. The primary goal is to ensure the safety of drivers and vehicles. Collecting data involved gathering information on three key road events: normal street and normal drive, speed bumps, circular yellow speed bumps, and three aggressive driving actions: sudden start, sudden stop, and sudden entry. The gathered data is processed and analyzed using a machine learning system designed for limited power and memory devices. The developed system resulted in 91.9% accuracy, 93.6% precision, and 92% recall. The achieved inference time on an Arduino Nano 33 BLE Sense with a 32-bit CPU running at 64 MHz is 34 ms and requires 2.6 kB peak RAM and 139.9 kB program flash memory, making it suitable for resource-constrained embedded systems.
Optimizing Gradle Builds - Gradle DPE Tour Berlin 2024Sinan KOZAK
Sinan from the Delivery Hero mobile infrastructure engineering team shares a deep dive into performance acceleration with Gradle build cache optimizations. Sinan shares their journey into solving complex build-cache problems that affect Gradle builds. By understanding the challenges and solutions found in our journey, we aim to demonstrate the possibilities for faster builds. The case study reveals how overlapping outputs and cache misconfigurations led to significant increases in build times, especially as the project scaled up with numerous modules using Paparazzi tests. The journey from diagnosing to defeating cache issues offers invaluable lessons on maintaining cache integrity without sacrificing functionality.
Understanding Inductive Bias in Machine LearningSUTEJAS
This presentation explores the concept of inductive bias in machine learning. It explains how algorithms come with built-in assumptions and preferences that guide the learning process. You'll learn about the different types of inductive bias and how they can impact the performance and generalizability of machine learning models.
The presentation also covers the positive and negative aspects of inductive bias, along with strategies for mitigating potential drawbacks. We'll explore examples of how bias manifests in algorithms like neural networks and decision trees.
By understanding inductive bias, you can gain valuable insights into how machine learning models work and make informed decisions when building and deploying them.
Using recycled concrete aggregates (RCA) for pavements is crucial to achieving sustainability. Implementing RCA for new pavement can minimize carbon footprint, conserve natural resources, reduce harmful emissions, and lower life cycle costs. Compared to natural aggregate (NA), RCA pavement has fewer comprehensive studies and sustainability assessments.
A SYSTEMATIC RISK ASSESSMENT APPROACH FOR SECURING THE SMART IRRIGATION SYSTEMSIJNSA Journal
The smart irrigation system represents an innovative approach to optimize water usage in agricultural and landscaping practices. The integration of cutting-edge technologies, including sensors, actuators, and data analysis, empowers this system to provide accurate monitoring and control of irrigation processes by leveraging real-time environmental conditions. The main objective of a smart irrigation system is to optimize water efficiency, minimize expenses, and foster the adoption of sustainable water management methods. This paper conducts a systematic risk assessment by exploring the key components/assets and their functionalities in the smart irrigation system. The crucial role of sensors in gathering data on soil moisture, weather patterns, and plant well-being is emphasized in this system. These sensors enable intelligent decision-making in irrigation scheduling and water distribution, leading to enhanced water efficiency and sustainable water management practices. Actuators enable automated control of irrigation devices, ensuring precise and targeted water delivery to plants. Additionally, the paper addresses the potential threat and vulnerabilities associated with smart irrigation systems. It discusses limitations of the system, such as power constraints and computational capabilities, and calculates the potential security risks. The paper suggests possible risk treatment methods for effective secure system operation. In conclusion, the paper emphasizes the significant benefits of implementing smart irrigation systems, including improved water conservation, increased crop yield, and reduced environmental impact. Additionally, based on the security analysis conducted, the paper recommends the implementation of countermeasures and security approaches to address vulnerabilities and ensure the integrity and reliability of the system. By incorporating these measures, smart irrigation technology can revolutionize water management practices in agriculture, promoting sustainability, resource efficiency, and safeguarding against potential security threats.
The Python for beginners. This is an advance computer language.
Compilers
1.
2. STATEMENT OF PROBLEM
A compiler accepts a program written in a higher
level language as input and produces its machine
language equivalent as output.
Example:
WCM: PROCEDURE (RATE, START, FINISH);
DECLARE ( COST , RATE , START , FINISH) FIXED BINARY (31)
STATIC;
COST = RATE * (START – FINISH) + 2 * RATE * (START – FINISH –
100);
RETURN (COST) ;
END;
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3. Steps followed by compiler to produce machine code
Recognize certain string as basic elements.
Ex: COST := variable , WCM := label, PROCEDURE : = keyword and
“=“ := operator
Recognize combinations of elements as syntactic units and interpret
their meaning.
Ex: 1st statement is procedure name with three arguments
Allocate storage and assign locations for all variables in this
program.
Generate the appropriate object code.
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5. Ways of lexical process
Single continuous pass used to prepare a chain or table of
tokens
Reduces the size of token table by only parsing tokens as
necessary.
Discover and note lexical errors.
CLASSES OF UNIFORM
SYMBOLS:
IDENTIFIER(IDN)
TERMINAL SYMBOL(TRM)
LITERAL(LIT)
CLASS PTR
IDN
TRM
TRM
TRM
IDN
WCM
:
PROCEDURE
(
RATE
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6. Problem No: 2 – Recognizing syntactic units
and Interpreting Meaning (syntactic
construction)
Compiler must recognize the phrases &
interpret the meaning of the constructions.
Note syntactic errors
Some compiler guess what the programmer
did wrong & correct it.
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8. INTERMEDIATE FORM
Compiler creates an intermediate form of
source program.
It facilitates optimization of object code
It allows a logical separation between the
machine-independent phases & machine-
dependent phases
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9. ARITHMETIC STATEMENT
Parse tree - form of an arithmetic statement
Rules for converting an arithmetic statement
into a parse tree are:
Any variable is a terminal node of the tree
For every operator, construct a binary tree
whose left branch is the tree for operand 1 &
whose right branch is the tree for operand 2.
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11. MATRIX : Linear representation of the parse tree
Operations are listed sequentially
Each matrix entry has one operator and two operands.
Operands are uniform symbols
Matrix line no. O8perator Operand1 Operand2
1 - START FINISH
2 * RATE M1
3 * 2 RATE
4 - START FINISH
5 - M4 100
6 * M3 M5
7 + M2 M6
8 = COST M7
matrix
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12. NONARITHMETIC STATEMENTS
DO, IF GO TO ,etc replaced by sequential
ordering of individual matrix entries.
Operators are defined in later phases of
compiler
Operator Operand1 Operand2
Return COST
End
RETURN ( COST) ;
END ;
Matrix for RETURN & END statement
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13. NONEXECUTABLE STATEMENTS
No intermediate form for these statements
Information of these statements is entered into
tables
Name Base Scale Precisio
n(bits)
Storage
class
location
COST BINARY FIXED 31 STATIC 0
RATE BINARY FIXED 31 STATIC 4
START BINARY FIXED 31 STATIC 8
FINISH BINARY FIXED 31 STATIC 12
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14. Problem no. 3 – Storage Allocation
Storage allocation routine scans the identifier
table and assigns a location to each scalar.
Absolute address is unknown at load time.
Relative address format
Temporary locations for intermediate results of
the matrix(M!,M2,etc)
Operand Sign bit(1) 31 binary
digit
COST S
RATE I
START G
FINISH N
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15. Problem no. 4 – Code Generation
Based on matrix and table compiler generates object
code
A table with matrix operation and associated matrix
code is used for creating object deck.
Operators are treat as macro definition, operands as
arguments and production table as macro definition.
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16. Standard code definition for -,*,+,=
- L 1,&OPERAND1
S 1,&OPERAND2
ST 1,M&N
-------------------------------
* L 1,&OPERAND1
S 1,&OPERAND2
ST 1,M&N
------------------------------------
+ L 1,&OPERAND1
S 1,&OPERAND2
ST 1,M&N
------------------------------------
= L 1,&OPERAND1
S 1,&OPERAND2
ST 1,M&N
----------------------------------
MATRIX GENERATED CODE
1 - START FINISH L 1,START
S 1,FINISH
ST 1,M1
2 * RATE M1 L 1,RATE
M 0,M1
ST 1,M2
3 * 2 RATE L 1,=F’2’
M 0,RATE
ST 1,M3
4 - START FINISH L 1,START
S 1,FINISH
ST 1,M4
5 - M4 100 L 1,M4
S 1,=F’100’
ST 1,M5
6 * M3 M5 L 1,M3
M 0,M5
ST 1,M6
7 + M2 M6 L 1,M2
A 1,M6
ST 1,M7
8 = COST M7 L 1,M7
ST 1,COST
Code definition
Code generation
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17. Questions
Was it a good idea to generate code directly from the
matrix?
MACHINE INDEPENDENT OPTIMIZATION
Have we made the best use of machine we have at
our disposal?
MACHINE DEPENDENT OPTIMIZATION
Can we generate machine language directly?
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18. OPTIMIZATION(MACHINE-INDEPENDENT)
Delete all duplicate matrix entries of sub expression occurs in the
same statement more than once(a common sub expression)
Modify all references to the deleted entries
Done before code generation
Example
Matrix with common sub
expression
Matrix after elimination of common
sub expression
1 - START FINISH 1 - START FINISH
2 * RATE M1 2 * RATE M1
3 * 2 RATE 3 * 2 RATE
4 - START FINISH 4
5 - M4 100 5 - M1 100
6 * M3 M5 6 * M3 M5
7 + M2 M6 7 * M2 M6
8 = COST M7 8 = COST M7
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19. Other machine independent optimization steps
are:
Compile time computation of operations, both of
whose operands are constants
Movement of computations involving nonvarying
operands out of loops
Use of the properties of Boolean expression to
minimize their computation.
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20. machine dependent optimization steps are:
For temporary storage use registers, this reduce the
number of loads and stores from 14 to 5 in our
example
Use shorter and faster instructions whenever
possible
Advantages
Reduces memory space needed for the program
Execution time of the object program by factor of 2
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21. OPTIMIZATION(MACHINE-DEPENDENT)
Done while generating code
Optimized matrix First try Improved code
1 - START FINISH L
S
ST
1,START
1,FINISH
1,M1
L 1,START
1,FINISH M1-> R1
2 * RATE M1 L
M
ST
1,RATE
0,M1
1,M2
L
MR
3,RATE
2,1 M2->R3
3 * 2 RATE L
M
ST
1,=F’2’
0,RATE
1,M3
L
M
5,=F’2’
4,RATE M3->R5
4
5 - M1 100 L
S
ST
1,M1
1,=F’100’
1,M5
S 1,=F’100’ M5->R1
6 * M3 M5 L
M
ST
1,M3
0,M5
1,M6
LR
MR
7,5
6,1
M6->M7
7 + M2 M6 L
A
ST
1,M2
1,M6
1,M7
AR 3,7 M7->R3
8 = M7 COST L
ST
1,M7
1,COST
ST 3,COST
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22. ASSEMBLY PHASE
Assembly phase is similar to pass 2 of assembler
Defines labels and resolves all references
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24. LEXICAL PHASE
Task
To parse the source program into basic elements or
tokens of the language
Build literal table and an identifier table
Build a uniform symbol table
Database
Source program(string of characters)
Terminal table
Symbol Indicator precedence
; yes
Procedure no
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25. Database
Literal table
Identifier table
Uniform symbol table
Literal Base Scale Precision Other information Address
31 Decimal Fixed 2
Name Data attribute Address
WCM Filled by later phases
Table Index
IDN 1(WCM)
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26. Algorithm
Input string is separated into tokens by break
characters
Tokens are checked with entries of terminal table
If match then token is classified as terminal symbol and
an uniform symbol is created for type TRM
If not matched then checked as identifier or literal
If token start with alphabet and contain up to 30 more
characters or underscores. then classified as identifier
and an uniform symbol is created for type IDN
If not then checked as literal
If not fit into one of these categories, it is an error.
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27. SYNTAX PHASE
TASK
Recognize the major construct of the language and to
call the appropriate action routines that will generate
the intermediate from or matrix for these constructs.
Databases
Uniform symbol table
stack
Table Index
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28. Algorithm
Reduction are tested consecutively for match between old
top of stack field and the actual top of stack until match is
found.
When matched is found, the action routines specified in
the action field are executed in order from left to right.
When control returns to the syntax analyzer, it modifies
the top of stack to agree with the new top of stack field.
Step 1 is then repeated starting with the reduction
specified in the next reduction field.
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29. Interpretation phase
It is a collection of routines that are called when a
construct is recognized in the syntactic phase.
Routines are used to create an intermediate form of
the source program and add information to the
identifier table.
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30. Databases
Uniform symbol table
Stack
Identifier table
Matrix
Name Base Scale Precision Storage
class
Array
bound
Structure
info
Literal
value
Block
info
other address
Uniform
symbol
Uniform
symbol
Uniform
symbol
chaining
Operator Operand1 operand2 30jayashrisk
31. Temporary storage table
Algorithm
It contains collection of individual action routines
that accomplish specific tasks when invoked by the
syntax analysis phase
Routines are
Do any necessary additional parsing
Create new entries in the matrix or add data attributes
to the identifier operator and operands and insert them
into the matrix.
MTXN Base Scale Precision Storage
class
Other address
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33. Algorithm
Elimination of common sub expressions
Common sub expression must be identical and must be in
same statement
1. Place the matrix in a form so that common sub expressions
can be recognized
2. Recognize two sub expressions as being equivalent
3. Eliminate one of them
4. Alter the rest of the matrix to reflect the elimination of this
entry
5. Rescan the matrix for possible crated common sub
expressions repeat 1 to 5 until no change occur
6. Eliminate from the temporary storage table any MTX
entries that are no longer needed
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34. Example
Source code
B=A
A=C*D*(D*C+B)
MATRIX BEFORE OPTIMIZATION
M line
no
Operator Operand1 Operand2 Backward forward
M1 = B A 0 2
M2 * C D 1 3
M3 * D C 2 4
M4 + M3 B 3 5
M5 * M2 M4 4 6
M6 = A M5 5 ?
MATRIX BEFORE OPTIMIZATION
M line
no
Operat
or
Operan
d1
Operan
d2
Backw
ard
forwar
d
M1 = B A 0 2
M2 * C D 1 3
M3 * C D 2 4
M4 + B M3 3 5
M5 * M2 M4 4 6
M6 = A M5 5 ?
MATRIX AFTER OPTIMIZATION
M line
no
Operat
or
Operan
d1
Operan
d2
Backwa
rd
forward
M1 = B A 0 2
M2 * C D 1 4
M3 * C D 2 4
M4 + B M2 2 5
M5 * M2 M4 4 6
M6 = A M5 5 ?
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35. Compile time compute
Saves space and execution time for object program
Used for arithmetic computation within loop
Example
A=2*276/92*B = (2*276/92)*B = 6*B
Before optimization
M1 * 2 276
M2 / M1 92
M3 * M2 B
M4 = A M3
After optimization
M1
M2
M3 * 6 B
M4 = A M3
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36. Boolean expression optimization
Use properties of Boolean expression to shorten their
computation
Example
If(a or b or c)
If a is true the no need to check b and c
So eliminate that part
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37. Move invariant computations outside of loops
If the computation within a loop depends on a
variable that does not change within that loop, the
computation may be moved outside the loop
Recognition of invariant computations
Example
For(i=0;i<10;i++)
{
a=10;
i=i*2;
}
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38. Discovering where to move the invariant
computation
Move the computation to a position directly
preceding the LOOP from which it comes
Moving the invariant computation
Delete the invariant computation from its original
position in the matrix and insert it into the
appropriate place
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